On Monday 23 April 2007, Ingo Molnar wrote: > * Christian Hesse <[email protected]> wrote: > > On Friday 20 April 2007, Ingo Molnar wrote: > > > i'm pleased to announce release -v4 of the CFS patchset. > > > > Hi Ingo, hi Avi, hi all, > > > > I'm trying to use kvm-20 with cfs v4 and get a crash: > > > > eworm@revo:~$ /usr/local/kvm/bin/qemu -snapshot > > /mnt/data/virtual/qemu/winxp.img kvm_run: failed entry, reason 7 > > kvm_run returned -8 > > > > It works (though it is a bit slow) if I start qemu with strace, so for > > me it looks like a race condition? > > hm. Can you work it around with: > > echo 0 > /proc/sys/kernel/sched_granularity_ns > > ? > > If yes then this is a wakeup race: some piece of code relies on the > upstream scheduler preempting the waker task immediately in 99% of the > cases. > > and you might want to test -v5 too which i released earlier today. It > has no bugfix in this area though, so it will likely still trigger this > race - but it will also hopefully be even more pleasant to use than -v4 > ;-) Hi Ingo, This was kvm's fault. It works perfectly now without modifications to the scheduler. If anybody is interested in details please see the kvm mailing list archives. -- Regards, Chris
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- From: Ingo Molnar <[email protected]>
- crash with CFS v4 and qemu/kvm (was: [patch] CFS scheduler, v4)
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- Re: crash with CFS v4 and qemu/kvm (was: [patch] CFS scheduler, v4)
- From: Ingo Molnar <[email protected]>
- [patch] CFS scheduler, v4
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