[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. 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. Regards, Dario -- <<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:
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