Re: [Bug #12465] KVM guests stalling on 2.6.28 (bisected)

Avi Kivity
2009-01-21T14:59:20Z

Kevin Shanahan wrote:
>>> --- hermes-old.wumi.org.au ping statistics ---
>>> 900 packets transmitted, 900 received, 0% packet loss, time 899326ms
>>> rtt min/avg/max/mdev = 0.093/0.157/3.611/0.117 ms
>>>
>>> So, a _huge_ difference. But what does it mean?
>>>
>> It means, a scheduling problem. Can you run the latency tracer (which
>> only works with realtime priority), so we can tell if it is (a) kvm
>> failing to wake up the vcpu properly or (b) the scheduler delaying the
>> vcpu from running.
>>
>
> Sorry, but are you sure that's going to be useful?
>
> If it only works on realtime threads and I'm not seeing the problem when
> running kvm with realtime priority, is this going to tell you what you
> want to know?
>
> Not trying to be difficult, but that just didn't make sense to me.
>

You're right, wasn't thinking properly.

This is a tough one. I'll see if I can think of something. Ingo, any
ideas?

--
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