Re: High vm-exit latencies during kvm boot-up/shutdown

Avi Kivity
2007-10-26T12:21:56Z

Dong, Eddie wrote:
> Jan Kiszka wrote:
>
>> So if you want the higher performance of PCIe you need
>> performance-killing wbindv (not to speak of latency)? That sounds a
>> bit contradictory to me. So this is also true for native PCIe usage?
>>
>>
>
> Mmm, I won't say so. When you want to get RT performance, you
> won't use unknown OS such as Windows. If you use your RT
> linux, the OS (guest) itself should not use wbinvd.
>
>

Well, virtualization lets you use an unknown OS without fear of
compromising host security, so a real-time capable hypervisor (which kvm
is, or very nearly) should be able to let you use an unknown OS without
fear of compromising real-time response times. Right now the only
unresolvable issue I see is wbinvd.

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