Re: Why so many vm exits caused by ept violation

[Avi Kivity <avi@redhat.com>]

On 11/08/2010 02:15 PM, lidong chen wrote:
> I run my application both on xen and kvm, and I found the performance
> on kvm is worse than xen.
>
> kvm: 2.6.32-60.el6.x86_64 redhat 6 bate 2
> xen: xen3.4.2
>
> then i stat the vm exit reason, and i found the ept violation reason,
> kvm is much more than xen. the static result is :
>
> __ratelimit: 387 callbacks suppressed
> error gpa is 4273995776
> error gpa is 4273995776
> error gpa is 4273995776
> error gpa is 4273995776
> error gpa is 4273995776

fec00000, this is the IOAPIC.

What workload is this?  Are you using virtio?

> error gpa is 782336
> error gpa is 782336
> error gpa is 782336
> error gpa is 782336
> error gpa is 782336
> __ratelimit: 387 callbacks suppressed
> error gpa is 782336
> error gpa is 782336
> error gpa is 782336
> error gpa is 782336
> error gpa is 782336
> error gpa is 782336
> error gpa is 782336
> error gpa is 782336
> error gpa is 782336
> error gpa is 782336
>

bf000, this is the display.  What display mode are you using? is the 
workload display intensive?

Please provide reports using

   $ trace-cmd record -e kvm:kvm_page_fault
   ^C
   $ trace-cmd report


-- 
error compiling committee.c: too many arguments to function