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

Dong, Eddie
2007-10-29T08:32:32Z

Avi Kivity wrote:
> 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.
>
Got it, I was mis-understood the problem!
Eddie