See AlmaLinux and RockyLinux VM panicking. · Issue #3604 · lxc/incus · GitHub for info. Stephane suggested I post here for additional insight.
Would be useful if you could provide more details on the system itself, especially CPU vendor and model, QEMU version, kernel log output, …
This is a very old document, but still very relevant today: The SIG11 problem
Kernel builds are good at stressing the hardware, and so are running VMs.
I’ve been bitten by this myself in the past. I was able to prove it was a bad DIMM on a 2-DIMM system by running with just one DIMM, and then with just the other.
We need to wait for more details to know, but something else that comes to mind would be some of the new Intel consumer grade chips with a mix of cores. Not all cores may support the same features, so the VM could get re-scheduled over to a different core and then hit some odd issues when specific CPU extensions just disappear.
The kernel should be reasonably smart to avoid that, but it may still be an issue.
Anyway, hard to tell until we know more about the system.
adavis@boss5 (- /1 -) [~] $ lscpu
Architecture: x86_64
CPU op-mode(s): 32-bit, 64-bit
Address sizes: 42 bits physical, 48 bits virtual
Byte Order: Little Endian
CPU(s): 16
On-line CPU(s) list: 0-15
Vendor ID: GenuineIntel
Model name: Intel(R) Core(TM) Ultra 7 255H
CPU family: 6
Model: 197
Thread(s) per core: 1
Core(s) per socket: 16
Socket(s): 1
Stepping: 2
Microcode version: 0x121
Frequency boost: enabled
CPU(s) scaling MHz: 57%
CPU max MHz: 2001.0000
CPU min MHz: 400.0000
BogoMIPS: 7372.80
Flags: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1
gb rdtscp lm constant_tsc art arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc cpuid aperfmperf tsc_known_freq pni pclmulqdq dt
es64 monitor ds_cpl vmx smx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave av
x f16c rdrand lahf_lm abm 3dnowprefetch cpuid_fault epb ssbd ibrs ibpb stibp ibrs_enhanced tpr_shadow flexpriority ept vpid ept_ad fsgsb
ase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid rdseed adx smap clflushopt clwb intel_pt sha_ni xsaveopt xsavec xgetbv1 xsaves split_loc
k_detect avx_vnni lam wbnoinvd dtherm ida arat pln pts hwp hwp_notify hwp_act_window hwp_epp hwp_pkg_req hfi vnmi umip pku ospke waitpkg
gfni vaes vpclmulqdq rdpid bus_lock_detect movdiri movdir64b fsrm md_clear serialize arch_lbr ibt flush_l1d arch_capabilities
Virtualization features:
Virtualization: VT-x
Caches (sum of all):
L1d: 480 KiB (12 instances)
L1i: 768 KiB (12 instances)
L2: 28 MiB (9 instances)
L3: 24 MiB (1 instance)
NUMA:
NUMA node(s): 1
NUMA node0 CPU(s): 0-15
Vulnerabilities:
Gather data sampling: Not affected
Ghostwrite: Not affected
Indirect target selection: Not affected
Itlb multihit: Not affected
L1tf: Not affected
Mds: Not affected
Meltdown: Not affected
Mmio stale data: Not affected
Old microcode: Not affected
Reg file data sampling: Not affected
Retbleed: Not affected
Spec rstack overflow: Not affected
Spec store bypass: Mitigation; Speculative Store Bypass disabled via prctl
Spectre v1: Mitigation; usercopy/swapgs barriers and __user pointer sanitization
Spectre v2: Vulnerable: eIBRS with unprivileged eBPF
Srbds: Not affected
Tsa: Not affected
Tsx async abort: Not affected
Vmscape: Mitigation; IBPB before exit to userspace
Linux boss5.example.org 6.18.38 #1 SMP PREEMPT_DYNAMIC Sat Jul 4 19:11:50 EDT 2026 sx86_64 Intel(R) Core(TM) Ultra 7 255H GenuineIntel GNU/Linux
QEMU version: 10.0.11
64GB RAM. Nothing in the kernel logs.
Okay, so it is a setup with 3 tiers of cores.
You may want to use limits.cpu to pin the VM on just one set of cores to see if that helps.
Weird thing: this issue doesn’t happen with a Debian VM.
Yeah, it probably has some interaction with the guest kernel given that both Alma and Rocky would be on a similar kernel version and config.
I ran the following commands:
incus profile set vm-pcore limits.cpu='0-3'
incus launch images:almalinux/10 vmtest-alma -p agent -p vm-pcore --vm
We’ll see how it goes.
After about 2 hours, it panicked. I ran a memory check; that passed. I’ll run a VM in virt-manager to see if it happens there.
@stgraber When you test VMs, how many vCPUS do you allocate?
The automated image validation runs with just 1 CPU and 1GiB of RAM on 10GiB of disk (Incus defaults).
The Incus pre-release tests use long running VMs and those are more beefy, typically 4 vCPU and 8GB of RAM.
Here’s the relevant output for incus info --resources:
Cores:
- Core 0
Frequency: 1800Mhz
Threads:
- 0 (id: 0, online: true, NUMA node: 0)
- Core 4
Frequency: 1283Mhz
Threads:
- 0 (id: 1, online: true, NUMA node: 0)
- Core 8
Frequency: 1529Mhz
Threads:
- 0 (id: 6, online: true, NUMA node: 0)
- Core 9
Frequency: 1332Mhz
Threads:
- 0 (id: 7, online: true, NUMA node: 0)
- Core 10
Frequency: 1543Mhz
Threads:
- 0 (id: 8, online: true, NUMA node: 0)
- Core 11
Frequency: 1315Mhz
Threads:
- 0 (id: 9, online: true, NUMA node: 0)
- Core 12
Frequency: 1297Mhz
Threads:
- 0 (id: 10, online: true, NUMA node: 0)
- Core 13
Frequency: 1303Mhz
Threads:
- 0 (id: 11, online: true, NUMA node: 0)
- Core 14
Frequency: 1300Mhz
Threads:
- 0 (id: 12, online: true, NUMA node: 0)
- Core 15
Frequency: 1300Mhz
Threads:
- 0 (id: 13, online: true, NUMA node: 0)
- Core 16
Frequency: 400Mhz
Threads:
- 0 (id: 2, online: true, NUMA node: 0)
- Core 20
Frequency: 400Mhz
Threads:
- 0 (id: 3, online: true, NUMA node: 0)
- Core 24
Frequency: 400Mhz
Threads:
- 0 (id: 4, online: true, NUMA node: 0)
- Core 28
Frequency: 1286Mhz
Threads:
- 0 (id: 5, online: true, NUMA node: 0)
- Core 32
Frequency: 1568Mhz
Threads:
- 0 (id: 14, online: true, NUMA node: 0)
- Core 33
Frequency: 1014Mhz
Threads:
- 0 (id: 15, online: true, NUMA node: 0)
Frequency: 1191Mhz (min: 400Mhz, max: 2001Mhz)
Did I choose the correct values for limits.cpu?
Honestly hard to tell from that output.
Can you show incus query /1.0/resources, the full CPU details may be enough to figure it out.
Otherwise I wonder if lscpu would tell us about what core is what.
incus query /1.0/resources
{
"cpu": {
"architecture": "x86_64",
"sockets": [
{
"address_sizes": {
"physical_bits": 42,
"virtual_bits": 48
},
"cache": [
{
"level": 1,
"size": 49152,
"type": "Data"
},
{
"level": 1,
"size": 65536,
"type": "Instruction"
},
{
"level": 2,
"size": 3145728,
"type": "Unified"
},
{
"level": 3,
"size": 25165824,
"type": "Unified"
}
],
"cores": [
{
"core": 0,
"die": 0,
"flags": [
"fpu",
"vme",
"de",
"pse",
"tsc",
"msr",
"pae",
"mce",
"cx8",
"apic",
"sep",
"mtrr",
"pge",
"mca",
"cmov",
"pat",
"pse36",
"clflush",
"dts",
"acpi",
"mmx",
"fxsr",
"sse",
"sse2",
"ss",
"ht",
"tm",
"pbe",
"syscall",
"nx",
"pdpe1gb",
"rdtscp",
"lm",
"constant_tsc",
"art",
"arch_perfmon",
"pebs",
"bts",
"rep_good",
"nopl",
"xtopology",
"nonstop_tsc",
"cpuid",
"aperfmperf",
"tsc_known_freq",
"pni",
"pclmulqdq",
"dtes64",
"monitor",
"ds_cpl",
"vmx",
"smx",
"est",
"tm2",
"ssse3",
"sdbg",
"fma",
"cx16",
"xtpr",
"pdcm",
"pcid",
"sse4_1",
"sse4_2",
"x2apic",
"movbe",
"popcnt",
"tsc_deadline_timer",
"aes",
"xsave",
"avx",
"f16c",
"rdrand",
"lahf_lm",
"abm",
"3dnowprefetch",
"cpuid_fault",
"epb",
"ssbd",
"ibrs",
"ibpb",
"stibp",
"ibrs_enhanced",
"tpr_shadow",
"flexpriority",
"ept",
"vpid",
"ept_ad",
"fsgsbase",
"tsc_adjust",
"bmi1",
"avx2",
"smep",
"bmi2",
"erms",
"invpcid",
"rdseed",
"adx",
"smap",
"clflushopt",
"clwb",
"intel_pt",
"sha_ni",
"xsaveopt",
"xsavec",
"xgetbv1",
"xsaves",
"split_lock_detect",
"avx_vnni",
"lam",
"wbnoinvd",
"dtherm",
"ida",
"arat",
"pln",
"pts",
"hwp",
"hwp_notify",
"hwp_act_window",
"hwp_epp",
"hwp_pkg_req",
"hfi",
"vnmi",
"umip",
"pku",
"ospke",
"waitpkg",
"gfni",
"vaes",
"vpclmulqdq",
"rdpid",
"bus_lock_detect",
"movdiri",
"movdir64b",
"fsrm",
"md_clear",
"serialize",
"arch_lbr",
"ibt",
"flush_l1d",
"arch_capabilities"
],
"frequency": 400,
"threads": [
{
"id": 0,
"isolated": false,
"numa_node": 0,
"online": true,
"thread": 0
}
]
},
{
"core": 4,
"die": 0,
"flags": [
"fpu",
"vme",
"de",
"pse",
"tsc",
"msr",
"pae",
"mce",
"cx8",
"apic",
"sep",
"mtrr",
"pge",
"mca",
"cmov",
"pat",
"pse36",
"clflush",
"dts",
"acpi",
"mmx",
"fxsr",
"sse",
"sse2",
"ss",
"ht",
"tm",
"pbe",
"syscall",
"nx",
"pdpe1gb",
"rdtscp",
"lm",
"constant_tsc",
"art",
"arch_perfmon",
"pebs",
"bts",
"rep_good",
"nopl",
"xtopology",
"nonstop_tsc",
"cpuid",
"aperfmperf",
"tsc_known_freq",
"pni",
"pclmulqdq",
"dtes64",
"monitor",
"ds_cpl",
"vmx",
"smx",
"est",
"tm2",
"ssse3",
"sdbg",
"fma",
"cx16",
"xtpr",
"pdcm",
"pcid",
"sse4_1",
"sse4_2",
"x2apic",
"movbe",
"popcnt",
"tsc_deadline_timer",
"aes",
"xsave",
"avx",
"f16c",
"rdrand",
"lahf_lm",
"abm",
"3dnowprefetch",
"cpuid_fault",
"epb",
"ssbd",
"ibrs",
"ibpb",
"stibp",
"ibrs_enhanced",
"tpr_shadow",
"flexpriority",
"ept",
"vpid",
"ept_ad",
"fsgsbase",
"tsc_adjust",
"bmi1",
"avx2",
"smep",
"bmi2",
"erms",
"invpcid",
"rdseed",
"adx",
"smap",
"clflushopt",
"clwb",
"intel_pt",
"sha_ni",
"xsaveopt",
"xsavec",
"xgetbv1",
"xsaves",
"split_lock_detect",
"avx_vnni",
"lam",
"wbnoinvd",
"dtherm",
"ida",
"arat",
"pln",
"pts",
"hwp",
"hwp_notify",
"hwp_act_window",
"hwp_epp",
"hwp_pkg_req",
"hfi",
"vnmi",
"umip",
"pku",
"ospke",
"waitpkg",
"gfni",
"vaes",
"vpclmulqdq",
"rdpid",
"bus_lock_detect",
"movdiri",
"movdir64b",
"fsrm",
"md_clear",
"serialize",
"arch_lbr",
"ibt",
"flush_l1d",
"arch_capabilities"
],
"frequency": 1801,
"threads": [
{
"id": 1,
"isolated": false,
"numa_node": 0,
"online": true,
"thread": 0
}
]
},
{
"core": 8,
"die": 0,
"flags": [
"fpu",
"vme",
"de",
"pse",
"tsc",
"msr",
"pae",
"mce",
"cx8",
"apic",
"sep",
"mtrr",
"pge",
"mca",
"cmov",
"pat",
"pse36",
"clflush",
"dts",
"acpi",
"mmx",
"fxsr",
"sse",
"sse2",
"ss",
"ht",
"tm",
"pbe",
"syscall",
"nx",
"pdpe1gb",
"rdtscp",
"lm",
"constant_tsc",
"art",
"arch_perfmon",
"pebs",
"bts",
"rep_good",
"nopl",
"xtopology",
"nonstop_tsc",
"cpuid",
"aperfmperf",
"tsc_known_freq",
"pni",
"pclmulqdq",
"dtes64",
"monitor",
"ds_cpl",
"vmx",
"smx",
"est",
"tm2",
"ssse3",
"sdbg",
"fma",
"cx16",
"xtpr",
"pdcm",
"pcid",
"sse4_1",
"sse4_2",
"x2apic",
"movbe",
"popcnt",
"tsc_deadline_timer",
"aes",
"xsave",
"avx",
"f16c",
"rdrand",
"lahf_lm",
"abm",
"3dnowprefetch",
"cpuid_fault",
"epb",
"ssbd",
"ibrs",
"ibpb",
"stibp",
"ibrs_enhanced",
"tpr_shadow",
"flexpriority",
"ept",
"vpid",
"ept_ad",
"fsgsbase",
"tsc_adjust",
"bmi1",
"avx2",
"smep",
"bmi2",
"erms",
"invpcid",
"rdseed",
"adx",
"smap",
"clflushopt",
"clwb",
"intel_pt",
"sha_ni",
"xsaveopt",
"xsavec",
"xgetbv1",
"xsaves",
"split_lock_detect",
"avx_vnni",
"lam",
"wbnoinvd",
"dtherm",
"ida",
"arat",
"pln",
"pts",
"hwp",
"hwp_notify",
"hwp_act_window",
"hwp_epp",
"hwp_pkg_req",
"hfi",
"vnmi",
"umip",
"pku",
"ospke",
"waitpkg",
"gfni",
"vaes",
"vpclmulqdq",
"rdpid",
"bus_lock_detect",
"movdiri",
"movdir64b",
"fsrm",
"md_clear",
"serialize",
"arch_lbr",
"ibt",
"flush_l1d",
"arch_capabilities"
],
"frequency": 400,
"threads": [
{
"id": 6,
"isolated": false,
"numa_node": 0,
"online": true,
"thread": 0
}
]
},
{
"core": 9,
"die": 0,
"flags": [
"fpu",
"vme",
"de",
"pse",
"tsc",
"msr",
"pae",
"mce",
"cx8",
"apic",
"sep",
"mtrr",
"pge",
"mca",
"cmov",
"pat",
"pse36",
"clflush",
"dts",
"acpi",
"mmx",
"fxsr",
"sse",
"sse2",
"ss",
"ht",
"tm",
"pbe",
"syscall",
"nx",
"pdpe1gb",
"rdtscp",
"lm",
"constant_tsc",
"art",
"arch_perfmon",
"pebs",
"bts",
"rep_good",
"nopl",
"xtopology",
"nonstop_tsc",
"cpuid",
"aperfmperf",
"tsc_known_freq",
"pni",
"pclmulqdq",
"dtes64",
"monitor",
"ds_cpl",
"vmx",
"smx",
"est",
"tm2",
"ssse3",
"sdbg",
"fma",
"cx16",
"xtpr",
"pdcm",
"pcid",
"sse4_1",
"sse4_2",
"x2apic",
"movbe",
"popcnt",
"tsc_deadline_timer",
"aes",
"xsave",
"avx",
"f16c",
"rdrand",
"lahf_lm",
"abm",
"3dnowprefetch",
"cpuid_fault",
"epb",
"ssbd",
"ibrs",
"ibpb",
"stibp",
"ibrs_enhanced",
"tpr_shadow",
"flexpriority",
"ept",
"vpid",
"ept_ad",
"fsgsbase",
"tsc_adjust",
"bmi1",
"avx2",
"smep",
"bmi2",
"erms",
"invpcid",
"rdseed",
"adx",
"smap",
"clflushopt",
"clwb",
"intel_pt",
"sha_ni",
"xsaveopt",
"xsavec",
"xgetbv1",
"xsaves",
"split_lock_detect",
"avx_vnni",
"lam",
"wbnoinvd",
"dtherm",
"ida",
"arat",
"pln",
"pts",
"hwp",
"hwp_notify",
"hwp_act_window",
"hwp_epp",
"hwp_pkg_req",
"hfi",
"vnmi",
"umip",
"pku",
"ospke",
"waitpkg",
"gfni",
"vaes",
"vpclmulqdq",
"rdpid",
"bus_lock_detect",
"movdiri",
"movdir64b",
"fsrm",
"md_clear",
"serialize",
"arch_lbr",
"ibt",
"flush_l1d",
"arch_capabilities"
],
"frequency": 3832,
"threads": [
{
"id": 7,
"isolated": false,
"numa_node": 0,
"online": true,
"thread": 0
}
]
},
{
"core": 10,
"die": 0,
"flags": [
"fpu",
"vme",
"de",
"pse",
"tsc",
"msr",
"pae",
"mce",
"cx8",
"apic",
"sep",
"mtrr",
"pge",
"mca",
"cmov",
"pat",
"pse36",
"clflush",
"dts",
"acpi",
"mmx",
"fxsr",
"sse",
"sse2",
"ss",
"ht",
"tm",
"pbe",
"syscall",
"nx",
"pdpe1gb",
"rdtscp",
"lm",
"constant_tsc",
"art",
"arch_perfmon",
"pebs",
"bts",
"rep_good",
"nopl",
"xtopology",
"nonstop_tsc",
"cpuid",
"aperfmperf",
"tsc_known_freq",
"pni",
"pclmulqdq",
"dtes64",
"monitor",
"ds_cpl",
"vmx",
"smx",
"est",
"tm2",
"ssse3",
"sdbg",
"fma",
"cx16",
"xtpr",
"pdcm",
"pcid",
"sse4_1",
"sse4_2",
"x2apic",
"movbe",
"popcnt",
"tsc_deadline_timer",
"aes",
"xsave",
"avx",
"f16c",
"rdrand",
"lahf_lm",
"abm",
"3dnowprefetch",
"cpuid_fault",
"epb",
"ssbd",
"ibrs",
"ibpb",
"stibp",
"ibrs_enhanced",
"tpr_shadow",
"flexpriority",
"ept",
"vpid",
"ept_ad",
"fsgsbase",
"tsc_adjust",
"bmi1",
"avx2",
"smep",
"bmi2",
"erms",
"invpcid",
"rdseed",
"adx",
"smap",
"clflushopt",
"clwb",
"intel_pt",
"sha_ni",
"xsaveopt",
"xsavec",
"xgetbv1",
"xsaves",
"split_lock_detect",
"avx_vnni",
"lam",
"wbnoinvd",
"dtherm",
"ida",
"arat",
"pln",
"pts",
"hwp",
"hwp_notify",
"hwp_act_window",
"hwp_epp",
"hwp_pkg_req",
"hfi",
"vnmi",
"umip",
"pku",
"ospke",
"waitpkg",
"gfni",
"vaes",
"vpclmulqdq",
"rdpid",
"bus_lock_detect",
"movdiri",
"movdir64b",
"fsrm",
"md_clear",
"serialize",
"arch_lbr",
"ibt",
"flush_l1d",
"arch_capabilities"
],
"frequency": 3982,
"threads": [
{
"id": 8,
"isolated": false,
"numa_node": 0,
"online": true,
"thread": 0
}
]
},
{
"core": 11,
"die": 0,
"flags": [
"fpu",
"vme",
"de",
"pse",
"tsc",
"msr",
"pae",
"mce",
"cx8",
"apic",
"sep",
"mtrr",
"pge",
"mca",
"cmov",
"pat",
"pse36",
"clflush",
"dts",
"acpi",
"mmx",
"fxsr",
"sse",
"sse2",
"ss",
"ht",
"tm",
"pbe",
"syscall",
"nx",
"pdpe1gb",
"rdtscp",
"lm",
"constant_tsc",
"art",
"arch_perfmon",
"pebs",
"bts",
"rep_good",
"nopl",
"xtopology",
"nonstop_tsc",
"cpuid",
"aperfmperf",
"tsc_known_freq",
"pni",
"pclmulqdq",
"dtes64",
"monitor",
"ds_cpl",
"vmx",
"smx",
"est",
"tm2",
"ssse3",
"sdbg",
"fma",
"cx16",
"xtpr",
"pdcm",
"pcid",
"sse4_1",
"sse4_2",
"x2apic",
"movbe",
"popcnt",
"tsc_deadline_timer",
"aes",
"xsave",
"avx",
"f16c",
"rdrand",
"lahf_lm",
"abm",
"3dnowprefetch",
"cpuid_fault",
"epb",
"ssbd",
"ibrs",
"ibpb",
"stibp",
"ibrs_enhanced",
"tpr_shadow",
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"ept",
"vpid",
"ept_ad",
"fsgsbase",
"tsc_adjust",
"bmi1",
"avx2",
"smep",
"bmi2",
"erms",
"invpcid",
"rdseed",
"adx",
"smap",
"clflushopt",
"clwb",
"intel_pt",
"sha_ni",
"xsaveopt",
"xsavec",
"xgetbv1",
"xsaves",
"split_lock_detect",
"avx_vnni",
"lam",
"wbnoinvd",
"dtherm",
"ida",
"arat",
"pln",
"pts",
"hwp",
"hwp_notify",
"hwp_act_window",
"hwp_epp",
"hwp_pkg_req",
"hfi",
"vnmi",
"umip",
"pku",
"ospke",
"waitpkg",
"gfni",
"vaes",
"vpclmulqdq",
"rdpid",
"bus_lock_detect",
"movdiri",
"movdir64b",
"fsrm",
"md_clear",
"serialize",
"arch_lbr",
"ibt",
"flush_l1d",
"arch_capabilities"
],
"frequency": 400,
"threads": [
{
"id": 5,
"isolated": false,
"numa_node": 0,
"online": true,
"thread": 0
}
]
},
{
"core": 32,
"die": 0,
"flags": [
"fpu",
"vme",
"de",
"pse",
"tsc",
"msr",
"pae",
"mce",
"cx8",
"apic",
"sep",
"mtrr",
"pge",
"mca",
"cmov",
"pat",
"pse36",
"clflush",
"dts",
"acpi",
"mmx",
"fxsr",
"sse",
"sse2",
"ss",
"ht",
"tm",
"pbe",
"syscall",
"nx",
"pdpe1gb",
"rdtscp",
"lm",
"constant_tsc",
"art",
"arch_perfmon",
"pebs",
"bts",
"rep_good",
"nopl",
"xtopology",
"nonstop_tsc",
"cpuid",
"aperfmperf",
"tsc_known_freq",
"pni",
"pclmulqdq",
"dtes64",
"monitor",
"ds_cpl",
"vmx",
"smx",
"est",
"tm2",
"ssse3",
"sdbg",
"fma",
"cx16",
"xtpr",
"pdcm",
"pcid",
"sse4_1",
"sse4_2",
"x2apic",
"movbe",
"popcnt",
"tsc_deadline_timer",
"aes",
"xsave",
"avx",
"f16c",
"rdrand",
"lahf_lm",
"abm",
"3dnowprefetch",
"cpuid_fault",
"epb",
"ssbd",
"ibrs",
"ibpb",
"stibp",
"ibrs_enhanced",
"tpr_shadow",
"flexpriority",
"ept",
"vpid",
"ept_ad",
"fsgsbase",
"tsc_adjust",
"bmi1",
"avx2",
"smep",
"bmi2",
"erms",
"invpcid",
"rdseed",
"adx",
"smap",
"clflushopt",
"clwb",
"intel_pt",
"sha_ni",
"xsaveopt",
"xsavec",
"xgetbv1",
"xsaves",
"split_lock_detect",
"avx_vnni",
"lam",
"wbnoinvd",
"dtherm",
"ida",
"arat",
"pln",
"pts",
"hwp",
"hwp_notify",
"hwp_act_window",
"hwp_epp",
"hwp_pkg_req",
"hfi",
"vnmi",
"umip",
"pku",
"ospke",
"waitpkg",
"gfni",
"vaes",
"vpclmulqdq",
"rdpid",
"bus_lock_detect",
"movdiri",
"movdir64b",
"fsrm",
"md_clear",
"serialize",
"arch_lbr",
"ibt",
"flush_l1d",
"arch_capabilities"
],
"frequency": 400,
"threads": [
{
"id": 14,
"isolated": false,
"numa_node": 0,
"online": true,
"thread": 0
}
]
},
{
"core": 33,
"die": 0,
"flags": [
"fpu",
"vme",
"de",
"pse",
"tsc",
"msr",
"pae",
"mce",
"cx8",
"apic",
"sep",
"mtrr",
"pge",
"mca",
"cmov",
"pat",
"pse36",
"clflush",
"dts",
"acpi",
"mmx",
"fxsr",
"sse",
"sse2",
"ss",
"ht",
"tm",
"pbe",
"syscall",
"nx",
"pdpe1gb",
"rdtscp",
"lm",
"constant_tsc",
"art",
"arch_perfmon",
"pebs",
"bts",
"rep_good",
"nopl",
"xtopology",
"nonstop_tsc",
"cpuid",
"aperfmperf",
"tsc_known_freq",
"pni",
"pclmulqdq",
"dtes64",
"monitor",
"ds_cpl",
"vmx",
"smx",
"est",
"tm2",
"ssse3",
"sdbg",
"fma",
"cx16",
"xtpr",
"pdcm",
"pcid",
"sse4_1",
"sse4_2",
"x2apic",
"movbe",
"popcnt",
"tsc_deadline_timer",
"aes",
"xsave",
"avx",
"f16c",
"rdrand",
"lahf_lm",
"abm",
"3dnowprefetch",
"cpuid_fault",
"epb",
"ssbd",
"ibrs",
"ibpb",
"stibp",
"ibrs_enhanced",
"tpr_shadow",
"flexpriority",
"ept",
"vpid",
"ept_ad",
"fsgsbase",
"tsc_adjust",
"bmi1",
"avx2",
"smep",
"bmi2",
"erms",
"invpcid",
"rdseed",
"adx",
"smap",
"clflushopt",
"clwb",
"intel_pt",
"sha_ni",
"xsaveopt",
"xsavec",
"xgetbv1",
"xsaves",
"split_lock_detect",
"avx_vnni",
"lam",
"wbnoinvd",
"dtherm",
"ida",
"arat",
"pln",
"pts",
"hwp",
"hwp_notify",
"hwp_act_window",
"hwp_epp",
"hwp_pkg_req",
"hfi",
"vnmi",
"umip",
"pku",
"ospke",
"waitpkg",
"gfni",
"vaes",
"vpclmulqdq",
"rdpid",
"bus_lock_detect",
"movdiri",
"movdir64b",
"fsrm",
"md_clear",
"serialize",
"arch_lbr",
"ibt",
"flush_l1d",
"arch_capabilities"
],
"frequency": 400,
"threads": [
{
"id": 15,
"isolated": false,
"numa_node": 0,
"online": true,
"thread": 0
}
]
}
],
"frequency": 1193,
"frequency_minimum": 400,
"frequency_turbo": 2001,
"name": "Intel(R) Core(TM) Ultra 7 255H",
"socket": 0,
"vendor": "GenuineIntel"
}
],
"total": 16
},
"gpu": {
"cards": [
{
"driver": "i915",
"driver_version": "6.18.38",
"drm": {
"card_device": "226:0",
"card_name": "card0",
"control_device": "226:0",
"control_name": "controlD64",
"id": 0,
"render_device": "226:128",
"render_name": "renderD128"
},
"numa_node": 0,
"pci_address": "0000:00:02.0",
"product": "Arrow Lake-P [Arc Pro 130T/140T]",
"product_id": "7d51",
"sriov": {
"current_vfs": 0,
"maximum_vfs": 7,
"vfs": null
},
"vendor": "Intel Corporation",
"vendor_id": "8086"
}
],
"total": 1
},
"load": {
"Average10Min": 0.38,
"Average1Min": 0,
"Average5Min": 0.07,
"Processes": 520
},
"memory": {
"hugepages_size": 2097152,
"hugepages_total": 0,
"hugepages_used": 0,
"nodes": [
{
"hugepages_total": 0,
"hugepages_used": 0,
"numa_node": 0,
"total": 68719476736,
"used": 57416105984
}
],
"total": 68719476736,
"used": 14203113472
},
"network": {
"cards": [
{
"driver": "e1000e",
"driver_version": "6.18.38",
"firmware_version": "1.1-4",
"numa_node": 0,
"pci_address": "0000:00:1f.6",
"ports": [
{
"address": "d4:93:90:57:31:3a",
"auto_negotiation": true,
"id": "eth0",
"link_detected": false,
"port": 0,
"port_type": "twisted pair",
"protocol": "ethernet",
"supported_modes": [
"10baseT/Half",
"10baseT/Full",
"100baseT/Half",
"100baseT/Full",
"1000baseT/Full"
],
"supported_ports": [
"twisted pair"
],
"transceiver_type": "internal"
}
],
"product": "Ethernet Connection (18) I219-LM",
"product_id": "550a",
"vendor": "Intel Corporation",
"vendor_id": "8086"
},
{
"driver": "iwlwifi",
"driver_version": "6.18.38",
"firmware_version": "101.6ef20b19.0 gl-c0-fm-c0-101.",
"numa_node": 0,
"pci_address": "0000:2f:00.0",
"ports": [
{
"address": "44:a3:bb:bb:58:e1",
"auto_negotiation": false,
"id": "wlan0",
"link_detected": true,
"port": 0,
"protocol": "ethernet"
}
],
"product": "Wi-Fi 7(802.11be) AX1775*/AX1790*/BE20*/BE401/BE1750* 2x2",
"product_id": "272b",
"vendor": "Intel Corporation",
"vendor_id": "8086"
}
],
"total": 2
},
"pci": {
"devices": [
{
"driver": "",
"driver_version": "",
"iommu_group": 1,
"numa_node": 0,
"pci_address": "0000:00:00.0",
"product": "Core Ultra 200H Series Processors with 6 P-Cores 8 E-Cores Host Bridge",
"product_id": "7d06",
"vendor": "Intel Corporation",
"vendor_id": "8086",
"vpd": {}
},
{
"driver": "i915",
"driver_version": "6.18.38",
"iommu_group": 0,
"numa_node": 0,
"pci_address": "0000:00:02.0",
"product": "Arrow Lake-P [Arc Pro 130T/140T]",
"product_id": "7d51",
"vendor": "Intel Corporation",
"vendor_id": "8086",
"vpd": {}
},
{
"driver": "pcieport",
"driver_version": "6.18.38",
"iommu_group": 2,
"numa_node": 0,
"pci_address": "0000:00:06.0",
"product": "Core Ultra 200 Series Processors PCIe Root Port #10",
"product_id": "7eca",
"vendor": "Intel Corporation",
"vendor_id": "8086",
"vpd": {}
},
{
"driver": "pcieport",
"driver_version": "6.18.38",
"iommu_group": 3,
"numa_node": 0,
"pci_address": "0000:00:06.2",
"product": "Core Ultra 200H/200V Series Processors PCIe Root Port #11 (PXPE)",
"product_id": "7ecb",
"vendor": "Intel Corporation",
"vendor_id": "8086",
"vpd": {}
},
{
"driver": "pcieport",
"driver_version": "6.18.38",
"iommu_group": 4,
"numa_node": 0,
"pci_address": "0000:00:07.0",
"product": "Core Ultra 200 Series Processors USB Type-C Subsystem PCIe Root Port #16",
"product_id": "7ec4",
"vendor": "Intel Corporation",
"vendor_id": "8086",
"vpd": {}
},
{
"driver": "",
"driver_version": "",
"iommu_group": 5,
"numa_node": 0,
"pci_address": "0000:00:0a.0",
"product": "Core Ultra 200H/200V Series Processors Platform Monitoring Technology (PMT)",
"product_id": "7d0d",
"vendor": "Intel Corporation",
"vendor_id": "8086",
"vpd": {}
},
{
"driver": "",
"driver_version": "",
"iommu_group": 6,
"numa_node": 0,
"pci_address": "0000:00:0b.0",
"product": "Core Ultra 200H/200V Series Processors NPU",
"product_id": "7d1d",
"vendor": "Intel Corporation",
"vendor_id": "8086",
"vpd": {}
},
{
"driver": "xhci_hcd",
"driver_version": "6.18.38",
"iommu_group": 7,
"numa_node": 0,
"pci_address": "0000:00:0d.0",
"product": "Core Ultra 200 Series Processors USB xHCI",
"product_id": "7ec0",
"vendor": "Intel Corporation",
"vendor_id": "8086",
"vpd": {}
},
{
"driver": "thunderbolt",
"driver_version": "6.18.38",
"iommu_group": 7,
"numa_node": 0,
"pci_address": "0000:00:0d.2",
"product": "Core Ultra 200 Series Processors Thunderbolt DMA0",
"product_id": "7ec2",
"vendor": "Intel Corporation",
"vendor_id": "8086",
"vpd": {}
},
{
"driver": "xhci_hcd",
"driver_version": "6.18.38",
"iommu_group": 8,
"numa_node": 0,
"pci_address": "0000:00:14.0",
"product": "Core Ultra 200H/200V Series Processors Standalone xHCI Controller",
"product_id": "777d",
"vendor": "Intel Corporation",
"vendor_id": "8086",
"vpd": {}
},
{
"driver": "",
"driver_version": "",
"iommu_group": 8,
"numa_node": 0,
"pci_address": "0000:00:14.2",
"product": "Core Ultra 200H/200V Series Processors Shared SRAM",
"product_id": "777f",
"vendor": "Intel Corporation",
"vendor_id": "8086",
"vpd": {}
},
{
"driver": "intel-lpss",
"driver_version": "6.18.38",
"iommu_group": 9,
"numa_node": 0,
"pci_address": "0000:00:15.0",
"product": "Core Ultra 200H/200V Series Processors I2C #0",
"product_id": "7778",
"vendor": "Intel Corporation",
"vendor_id": "8086",
"vpd": {}
},
{
"driver": "intel-lpss",
"driver_version": "6.18.38",
"iommu_group": 9,
"numa_node": 0,
"pci_address": "0000:00:15.1",
"product": "Core Ultra 200H/200V Series Processors I2C #1",
"product_id": "7779",
"vendor": "Intel Corporation",
"vendor_id": "8086",
"vpd": {}
},
{
"driver": "pcieport",
"driver_version": "6.18.38",
"iommu_group": 10,
"numa_node": 0,
"pci_address": "0000:00:1c.0",
"product": "Core Ultra 200H/200V Series Processors PCIe Root Port #6",
"product_id": "773d",
"vendor": "Intel Corporation",
"vendor_id": "8086",
"vpd": {}
},
{
"driver": "pcieport",
"driver_version": "6.18.38",
"iommu_group": 11,
"numa_node": 0,
"pci_address": "0000:00:1c.7",
"product": "Core Ultra 200H/200V Series Processors PCIe Root Port #8",
"product_id": "773f",
"vendor": "Intel Corporation",
"vendor_id": "8086",
"vpd": {}
},
{
"driver": "",
"driver_version": "",
"iommu_group": 12,
"numa_node": 0,
"pci_address": "0000:00:1f.0",
"product": "Arrow Lake-H eSPI Controller",
"product_id": "7702",
"vendor": "Intel Corporation",
"vendor_id": "8086",
"vpd": {}
},
{
"driver": "snd_hda_intel",
"driver_version": "6.18.38",
"iommu_group": 12,
"numa_node": 0,
"pci_address": "0000:00:1f.3",
"product": "Core Ultra 200H/200V Series Processors HD Audio",
"product_id": "7728",
"vendor": "Intel Corporation",
"vendor_id": "8086",
"vpd": {}
},
{
"driver": "i801_smbus",
"driver_version": "6.18.38",
"iommu_group": 12,
"numa_node": 0,
"pci_address": "0000:00:1f.4",
"product": "Core Ultra 200H/200V Series Processors SMBus",
"product_id": "7722",
"vendor": "Intel Corporation",
"vendor_id": "8086",
"vpd": {}
},
{
"driver": "intel-spi",
"driver_version": "6.18.38",
"iommu_group": 12,
"numa_node": 0,
"pci_address": "0000:00:1f.5",
"product": "Core Ultra 200H/200V Series Processors SPI (flash) Controller",
"product_id": "7723",
"vendor": "Intel Corporation",
"vendor_id": "8086",
"vpd": {}
},
{
"driver": "e1000e",
"driver_version": "6.18.38",
"iommu_group": 12,
"numa_node": 0,
"pci_address": "0000:00:1f.6",
"product": "Ethernet Connection (18) I219-LM",
"product_id": "550a",
"vendor": "Intel Corporation",
"vendor_id": "8086",
"vpd": {}
},
{
"driver": "nvme",
"driver_version": "1.0",
"iommu_group": 13,
"numa_node": 0,
"pci_address": "0000:01:00.0",
"product": "NVMe SSD Controller S4LV008[Pascal]",
"product_id": "a80c",
"vendor": "Samsung Electronics Co Ltd",
"vendor_id": "144d",
"vpd": {}
},
{
"driver": "nvme",
"driver_version": "1.0",
"iommu_group": 14,
"numa_node": 0,
"pci_address": "0000:02:00.0",
"product": "Platinum P41/PC801 NVMe Solid State Drive",
"product_id": "1959",
"vendor": "SK hynix",
"vendor_id": "1c5c",
"vpd": {}
},
{
"driver": "sdhci-pci",
"driver_version": "6.18.38",
"iommu_group": 15,
"numa_node": 0,
"pci_address": "0000:2e:00.0",
"product": "OZ711 SD/MMC Card Reader Controller",
"product_id": "8621",
"vendor": "O2 Micro, Inc.",
"vendor_id": "1217",
"vpd": {}
},
{
"driver": "iwlwifi",
"driver_version": "6.18.38",
"iommu_group": 16,
"numa_node": 0,
"pci_address": "0000:2f:00.0",
"product": "Wi-Fi 7(802.11be) AX1775*/AX1790*/BE20*/BE401/BE1750* 2x2",
"product_id": "272b",
"vendor": "Intel Corporation",
"vendor_id": "8086",
"vpd": {}
}
],
"total": 24
},
"serial": {
"devices": [],
"total": 0
},
"storage": {
"disks": [
{
"block_size": 512,
"device": "259:0",
"device_id": "nvme-eui.002538425141003a",
"firmware_version": "5B2QJXD7",
"id": "nvme0n1",
"model": "Samsung SSD 990 PRO 2TB",
"numa_node": 0,
"partitions": [
{
"device": "259:1",
"id": "nvme0n1p1",
"partition": 1,
"read_only": false,
"size": 1023410176
},
{
"device": "259:2",
"id": "nvme0n1p2",
"partition": 2,
"read_only": false,
"size": 1999374385152
}
],
"pci_address": "0000:01:00.0",
"read_only": false,
"removable": false,
"rpm": 0,
"serial": "S7L9NJ0Y213669Y",
"size": 2000398934016,
"type": "nvme",
"wwn": "eui.002538425141003a"
},
{
"block_size": 512,
"device": "259:3",
"device_id": "nvme-eui.ace42e00352e16cf2ee4ac0000000001",
"firmware_version": "51060A20",
"id": "nvme1n1",
"model": "SHPP41-2000GM",
"numa_node": 0,
"partitions": [
{
"device": "259:4",
"id": "nvme1n1p1",
"partition": 1,
"read_only": false,
"size": 134217728
},
{
"device": "259:5",
"id": "nvme1n1p2",
"partition": 2,
"read_only": false,
"size": 2000263577600
}
],
"pci_address": "0000:02:00.0",
"read_only": false,
"removable": false,
"rpm": 0,
"serial": "SDC3N40191040334M",
"size": 2000398934016,
"type": "nvme",
"wwn": "eui.ace42e00352e16cf2ee4ac0000000001"
}
],
"total": 6
},
"system": {
"chassis": {
"serial": "",
"type": "Laptop",
"vendor": "System76",
"version": ""
},
"family": "",
"firmware": {
"date": "04/03/2025",
"vendor": "coreboot",
"version": "2025-04-03_04c4e20"
},
"motherboard": {
"product": "Darter Pro",
"serial": "123456789",
"vendor": "System76",
"version": "darp11"
},
"product": "Darter Pro",
"serial": "123456789",
"sku": "",
"type": "unknown",
"uuid": "",
"vendor": "System76",
"version": "darp11"
},
"usb": {
"devices": [
{
"bus_address": 3,
"device_address": 4,
"interfaces": [
{
"class": "",
"class_id": 224,
"driver": "btusb",
"driver_version": "0.8",
"number": 0,
"subclass": "",
"subclass_id": 1
},
{
"class": "",
"class_id": 224,
"driver": "btusb",
"driver_version": "0.8",
"number": 1,
"subclass": "",
"subclass_id": 1
}
],
"product": "",
"product_id": "0036",
"serial": "",
"speed": 12,
"vendor": "",
"vendor_id": "8087"
},
{
"bus_address": 3,
"device_address": 2,
"interfaces": [
{
"class": "",
"class_id": 14,
"driver": "uvcvideo",
"driver_version": "1.1.1",
"number": 0,
"subclass": "",
"subclass_id": 1
},
{
"class": "",
"class_id": 14,
"driver": "uvcvideo",
"driver_version": "1.1.1",
"number": 1,
"subclass": "",
"subclass_id": 2
},
{
"class": "",
"class_id": 254,
"driver": "",
"driver_version": "",
"number": 2,
"subclass": "",
"subclass_id": 1
}
],
"product": "Chicony USB2.0 Camera",
"product_id": "b729",
"serial": "",
"speed": 480,
"vendor": "",
"vendor_id": "04f2"
}
],
"total": 2
}
}
# lscpu
Architecture: x86_64
CPU op-mode(s): 32-bit, 64-bit
Address sizes: 42 bits physical, 48 bits virtual
Byte Order: Little Endian
CPU(s): 16
On-line CPU(s) list: 0-15
Vendor ID: GenuineIntel
Model name: Intel(R) Core(TM) Ultra 7 255H
CPU family: 6
Model: 197
Thread(s) per core: 1
Core(s) per socket: 16
Socket(s): 1
Stepping: 2
Microcode version: 0x121
Frequency boost: enabled
CPU(s) scaling MHz: 35%
CPU max MHz: 2001.0000
CPU min MHz: 400.0000
BogoMIPS: 7372.80
Flags: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_
tsc art arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc cpuid aperfmperf tsc_known_freq pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 sd
bg fma cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm 3dnowprefetch cpuid_fault epb ssbd ibrs
ibpb stibp ibrs_enhanced tpr_shadow flexpriority ept vpid ept_ad fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid rdseed adx smap clflushopt clwb intel_pt
sha_ni xsaveopt xsavec xgetbv1 xsaves split_lock_detect avx_vnni lam wbnoinvd dtherm ida arat pln pts hwp hwp_notify hwp_act_window hwp_epp hwp_pkg_req hfi v
nmi umip pku ospke waitpkg gfni vaes vpclmulqdq rdpid bus_lock_detect movdiri movdir64b fsrm md_clear serialize arch_lbr ibt flush_l1d arch_capabilities
Virtualization features:
Virtualization: VT-x
Caches (sum of all):
L1d: 480 KiB (12 instances)
L1i: 768 KiB (12 instances)
L2: 28 MiB (9 instances)
L3: 24 MiB (1 instance)
NUMA:
NUMA node(s): 1
NUMA node0 CPU(s): 0-15
Vulnerabilities:
Gather data sampling: Not affected
Ghostwrite: Not affected
Indirect target selection: Not affected
Itlb multihit: Not affected
L1tf: Not affected
Mds: Not affected
Meltdown: Not affected
Mmio stale data: Not affected
Old microcode: Not affected
Reg file data sampling: Not affected
Retbleed: Not affected
Spec rstack overflow: Not affected
Spec store bypass: Mitigation; Speculative Store Bypass disabled via prctl
Spectre v1: Mitigation; usercopy/swapgs barriers and __user pointer sanitization
Spectre v2: Vulnerable: eIBRS with unprivileged eBPF
Srbds: Not affected
Tsa: Not affected
Tsx async abort: Not affected
Vmscape: Mitigation; IBPB before exit to userspace
Ran Rocky Linux 10.2 on virt-manager with the same resources: the VM ran for nearly 8 hours with no issues. I even built the kernel from source. Will test Alma Linux later this evening.
Used an LLM on the data to identify things based on CPU flags and core IDs, that gave me:
| Core type | Physical core IDs | Thread IDs |
|---|---|---|
| P-cores (Lion Cove, 6) | 0, 4, 16, 20, 24, 28 | 0, 1, 2, 3, 4, 5 |
| E-cores (Skymont, 8) | 8–15 (two clusters of 4) | 6, 7, 8, 9, 10, 11, 12, 13 |
| LP E-cores (2) | 32, 33 | 14, 15 |
So no weird interleaving as we see when SMT is present or on multi-socket systems.
Your 0-3 should all have been P cores. It could be useful to get the full QEMU command line from libvirt so we can see if anything stands out that could explain the difference.
Rocky Linus worked w/o issue. Here is the QEMU command:
/opt/qemu-10.0/bin/qemu-system-x86_64 -name guest=rocky10.2,debug-threads=on -S -object {"qom-type":"secret","id":"masterKey0","format":"raw","file":"/home/adavis/.config/libvirt/qemu/lib/domain-3-rocky10.2/master-key.aes"} -machine pc-q35-10.0,usb=off,vmport=off,dump-guest-core=off,memory-backend=pc.ram,hpet=off,acpi=on -accel kvm -cpu host,migratable=on -m size=8388608k -object {"qom-type":"memory-backend-ram","id":"pc.ram","size":8589934592} -overcommit mem-lock=off -smp 4,sockets=4,cores=1,threads=1 -uuid 198be6d3-56c5-4f62-b401-7bcd5dac2184 -no-user-config -nodefaults -chardev socket,id=charmonitor,fd=28,server=on,wait=off -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc,driftfix=slew -global kvm-pit.lost_tick_policy=delay -no-shutdown -global ICH9-LPC.disable_s3=1 -global ICH9-LPC.disable_s4=1 -boot strict=on -device {"driver":"pcie-root-port","port":16,"chassis":1,"id":"pci.1","bus":"pcie.0","multifunction":true,"addr":"0x2"} -device {"driver":"pcie-root-port","port":17,"chassis":2,"id":"pci.2","bus":"pcie.0","addr":"0x2.0x1"} -device {"driver":"pcie-root-port","port":18,"chassis":3,"id":"pci.3","bus":"pcie.0","addr":"0x2.0x2"} -device {"driver":"pcie-root-port","port":19,"chassis":4,"id":"pci.4","bus":"pcie.0","addr":"0x2.0x3"} -device {"driver":"pcie-root-port","port":20,"chassis":5,"id":"pci.5","bus":"pcie.0","addr":"0x2.0x4"} -device {"driver":"pcie-root-port","port":21,"chassis":6,"id":"pci.6","bus":"pcie.0","addr":"0x2.0x5"} -device {"driver":"pcie-root-port","port":22,"chassis":7,"id":"pci.7","bus":"pcie.0","addr":"0x2.0x6"} -device {"driver":"pcie-root-port","port":23,"chassis":8,"id":"pci.8","bus":"pcie.0","addr":"0x2.0x7"} -device {"driver":"pcie-root-port","port":24,"chassis":9,"id":"pci.9","bus":"pcie.0","multifunction":true,"addr":"0x3"} -device {"driver":"pcie-root-port","port":25,"chassis":10,"id":"pci.10","bus":"pcie.0","addr":"0x3.0x1"} -device {"driver":"pcie-root-port","port":26,"chassis":11,"id":"pci.11","bus":"pcie.0","addr":"0x3.0x2"} -device {"driver":"pcie-root-port","port":27,"chassis":12,"id":"pci.12","bus":"pcie.0","addr":"0x3.0x3"} -device {"driver":"pcie-root-port","port":28,"chassis":13,"id":"pci.13","bus":"pcie.0","addr":"0x3.0x4"} -device {"driver":"pcie-root-port","port":29,"chassis":14,"id":"pci.14","bus":"pcie.0","addr":"0x3.0x5"} -device {"driver":"qemu-xhci","p2":15,"p3":15,"id":"usb","bus":"pci.2","addr":"0x0"} -device {"driver":"virtio-serial-pci","id":"virtio-serial0","bus":"pci.3","addr":"0x0"} -blockdev {"driver":"file","filename":"/spare/home/adavis/.local/share/libvirt/images/rocky10.2.qcow2","node-name":"libvirt-2-storage","auto-read-only":true,"discard":"unmap"} -blockdev {"node-name":"libvirt-2-format","read-only":false,"discard":"unmap","driver":"qcow2","file":"libvirt-2-storage","backing":null} -device {"driver":"virtio-blk-pci","bus":"pci.4","addr":"0x0","drive":"libvirt-2-format","id":"virtio-disk0","bootindex":1} -device {"driver":"ide-cd","bus":"ide.0","id":"sata0-0-0"} -netdev {"type":"user","id":"hostnet0"} -device {"driver":"virtio-net-pci","netdev":"hostnet0","id":"net0","mac":"52:54:00:4a:ca:d1","bus":"pci.1","addr":"0x0"} -chardev pty,id=charserial0 -device {"driver":"isa-serial","chardev":"charserial0","id":"serial0","index":0} -chardev socket,id=charchannel0,fd=27,server=on,wait=off -device {"driver":"virtserialport","bus":"virtio-serial0.0","nr":1,"chardev":"charchannel0","id":"channel0","name":"org.qemu.guest_agent.0"} -chardev spicevmc,id=charchannel1,name=vdagent -device {"driver":"virtserialport","bus":"virtio-serial0.0","nr":2,"chardev":"charchannel1","id":"channel1","name":"com.redhat.spice.0"} -device {"driver":"usb-tablet","id":"input0","bus":"usb.0","port":"1"} -audiodev {"id":"audio1","driver":"spice"} -spice port=5901,addr=127.0.0.1,disable-ticketing=on,image-compression=off,seamless-migration=on -device {"driver":"virtio-vga","id":"video0","max_outputs":1,"bus":"pcie.0","addr":"0x1"} -device {"driver":"ich9-intel-hda","id":"sound0","bus":"pcie.0","addr":"0x1b"} -device {"driver":"hda-duplex","id":"sound0-codec0","bus":"sound0.0","cad":0,"audiodev":"audio1"} -global ICH9-LPC.noreboot=off -watchdog-action reset -chardev spicevmc,id=charredir0,name=usbredir -device {"driver":"usb-redir","chardev":"charredir0","id":"redir0","bus":"usb.0","port":"2"} -chardev spicevmc,id=charredir1,name=usbredir -device {"driver":"usb-redir","chardev":"charredir1","id":"redir1","bus":"usb.0","port":"3"} -device {"driver":"virtio-balloon-pci","id":"balloon0","bus":"pci.5","addr":"0x0"} -object {"qom-type":"rng-random","id":"objrng0","filename":"/dev/urandom"} -device {"driver":"virtio-rng-pci","rng":"objrng0","id":"rng0","bus":"pci.6","addr":"0x0"} -sandbox on,obsolete=deny,elevateprivileges=deny,spawn=deny,resourcecontrol=deny -msg timestamp=on
Incus would have given you a 4 cores system whereas libvirt is giving you a 4 sockets single core system. No idea if that matters, but you could try limits.cpu=sockets=4 to get the same layout.
Other than that, it’s doing a few things differently as far as the q35 machine itself, specifically:
- vmport=off
- dump-guest-core=off
- hpet=off
- acpi=on
Not sure how many of those are relevant vs are the default value anyway (ACPI at least is).
I found out that running QEMU with NUMA not built in, stops the panics: the VM has been up for 2 days. Of course that disables pinning. I’m going to try the following with NUMA built in:
- Booting the host with NUMA=off (it’s not a true NUMA server; it’s using emulation mode).
- Running the VM with limits.cpu.nodes = 0.