Messages in this thread | | | Subject | Re: [PATCH v4 01/16] perf/x86/intel: Add x86_pmu.pebs_vmx for Ice Lake Servers | From | Liuxiangdong <> | Date | Wed, 14 Apr 2021 22:10:47 +0800 |
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On 2021/4/12 23:25, Andi Kleen wrote: >> The reason why soft lockup happens may be the unmapped EPT pages. So, do we >> have a way to map all gpa >> before we use pebs on Skylake? > Can you configure a VT-d device, that will implicitly pin all pages for the > IOMMU. I *think* that should be enough for testing. > > -Andi
Thanks! But, it doesn't seem to work because host still soft lockup when I configure a SR-IOV direct network card for vm.
Besides, I have tried to configure 1G-hugepages for 2G-mem vm. Each of guest numa nodes has 1G mem. When I use pebs (perf record -e cycles:pp) in guest, there are successful pebs samples on skylake just for a while and then I cannot get pebs sample. Host doesn't soft lockup in this process.
Is this method effective? Are there something wrong on skylake for we can only get a few samples ? Maybe IRQ?
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