Re: [Xen-devel] cpuidle causing Dom0 soft lockups

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

On 21/01/2010 10:53, "Jan Beulich" <JBeulich@xxxxxxxxxx> wrote:

> But that's exactly why we use the polling method: That way we don't
> need to wake up all potential waiters, but just the one that's going to
> get the lock next. We now even go further and detect whether the
> lock owner is not currently running, and go polling right away (instead
> of spinning on the lock a few hundred times first).

Ah, these are pv spinlocks?

> I can see your point. But how can you consider shipping with something
> apparently severely broken. As said before - the fact that this manifests
> itself by hanging many-vCPU Dom0 has the very likely implication that
> there are (so far unnoticed) problems with smaller Dom0-s. If I had a
> machine at hand that supports C3, I'd try to do some measurements
> with smaller domains...

Well it's a fallback I guess. If we can't make progress on solving it then I
suppose I agree.

 -- Keir



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