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

From: Avi Kivity
Date: Wed Jan 21 2009 - 10:00:55 EST

Kevin Shanahan wrote:
--- 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?

error compiling committee.c: too many arguments to function

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