* 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
;-)
Ingo
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