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?
