sr-iov also meet this problem, MSIX mask waste a lot of cpu resource.

I test kvm with sriov, which the vf driver could not disable msix.
so the host os waste a lot of cpu.  cpu rate of host os is 90%.

then I test xen with sriov, there ara also a lot of vm exits caused by
MSIX mask.
but the cpu rate of xen and domain0 is less than kvm. cpu rate of xen
and domain0 is 60%.

without sr-iov, the cpu rate of xen and domain0 is higher than kvm.

so i think the problem is kvm waste more cpu resource to deal with MSIX mask.
and we can see how xen deal with MSIX mask.

if this problem sloved, maybe with MSIX enabled, the performace is better.

2010/11/23 Avi Kivity <avi@redhat.com>:
quoted text
> On 11/23/2010 09:27 AM, lidong chen wrote:
>>
>> can you tell me something about this problem.
>> thanks.
>
> Which problem?
>
> --
> I have a truly marvellous patch that fixes the bug which this
> signature is too narrow to contain.
>
>
--
To unsubscribe from this list: send the line "unsubscribe kvm" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html