Messages in this thread | | | From | Wanpeng Li <> | Date | Thu, 4 Jul 2019 08:37:44 +0800 | Subject | Re: [PATCH v4 1/2] KVM: LAPIC: Optimize timer latency consider world switch time |
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On Wed, 3 Jul 2019 at 22:13, Paolo Bonzini <pbonzini@redhat.com> wrote: > > On 03/07/19 02:48, Wanpeng Li wrote: > > Hi Paolo, how about this patchset? Patch 2/2 is easy to take, do you > > have more concern about patch 1/2? > > I don't know. It seems somewhat hard to tune and in cyclictest it only > happens for preemption_timer=N. Are you using preemption_timer=N > together with the LAPIC-timer-on-service-CPU patches?
A 25ns conservative value makes no benefit for cyclictest any more even when preemption_timer=N. Btw, maybe it is the time to merge the LAPIC-timer-on-service-CPU patches now. :)
Regards, Wanpeng Li
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