[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Xen-devel] schedulers and topology exposing questions

On Wed, 2016-01-27 at 15:53 +0000, George Dunlap wrote:
> On 27/01/16 15:27, Konrad Rzeszutek Wilk wrote:
> > So Elena started looking at the CPU bound and seeing how Xen
> > behaves then
> > and if we can improve the floating situation as she saw some
> > abnormal
> > behavious.
> OK -- if the focus was on the two cases where the Xen credit1
> scheduler
> (apparently) co-located two cpu-burning vcpus on sibling threads,
> then
> yeah, that's behavior we should probably try to get to the bottom of.
Well, let's see the trace.Â

In any case, I'm up to trying hooking the SMT load balancer in
runq_tickle (which would mean doing it upon every vcpus wakeup).

My gut feeling is that the overhead my outwieght the benefit, and that
it will actually reveal useful only in a minority of the
cases/workloads, but it's maybe worth a try.

<<This happens because I choose it to happen!>> (Raistlin Majere)
Dario Faggioli, Ph.D, http://about.me/dario.faggioli
Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)

Attachment: signature.asc
Description: This is a digitally signed message part

Xen-devel mailing list



Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.