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SubjectRe: [RFC PATCH 0/4] Gang scheduling in CFS
On 12/19/2011 02:06 PM, Nikunj A Dadhania wrote:
> On Mon, 19 Dec 2011 13:59:37 +0200, Avi Kivity <avi@redhat.com> wrote:
> > On 12/19/2011 01:50 PM, Nikunj A Dadhania wrote:
> > > On Mon, 19 Dec 2011 13:44:02 +0200, Avi Kivity <avi@redhat.com> wrote:
> > > > On 12/19/2011 01:23 PM, Ingo Molnar wrote:
> > > > > What's behind this huge speedup? Does ebizzy use user-space
> > > > > spinlocks perhaps? Could we do something on the user-space side
> > > > > to get a similar speedup?
> > > >
> > > > kvm tries to detect spinlocks (by trapping repeated executions of PAUSE)
> > > > and yield to a related vcpu. It's far from perfect however, and relies
> > > > on the spinlock code using PAUSE.
> > > >
> > > Avi, is this soft-PLE kind of thing?
> >
> > No, hard PLE, see the calls to yield_to.
> >
> The above ebizzy result is from a non-PLE machine, will yield_to come
> in to picture here?

No. I have a soft-PLE patchset but I don't think it's any good.

--
error compiling committee.c: too many arguments to function



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