Hi folks,
I run kernel build in the guest and use perf kvm to get some VM-Exit result as the following:
Analyze events for all VCPUs:
VM-EXIT Samples Samples% Time% Min Time Max Time A
MSR_WRITE 3613908 57.53% 18.97% 5us 1362us 9.73
HLT 1399747 22.28% 74.90% 5us 432448us 99.24
CR_ACCESS 961203 15.30% 3.28% 4us 188us 6.33
EXTERNAL_INTERRUPT 213821 3.40% 2.25% 4us 4089us 19.54
EXCEPTION_NMI 25152 0.40% 0.12% 4us 71us 9.05
EPT_MISCONFIG 20104 0.32% 0.15% 8us 5628us 13.74
CPUID 19904 0.32% 0.07% 4us 220us 6.90
IO_INSTRUCTION 17097 0.27% 0.20% 13us 1008us 22.08
PAUSE_INSTRUCTION 10737 0.17% 0.05% 4us 53us 8.33
MSR_READ 48 0.00% 0.00% 4us 8us 5.62
Total Samples:6281721, Total events handled time:185457820.41us.
I also do some other experiments with different workload in the guest, I got the same results in terms of
HLT VM-Exit handling time. Does anyone know why the handling time for HLT VM-Exit is so high? Appreciate
You help!
Thanks,
Feng
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