Re: [PATCH v4 1/2] KVM: LAPIC: Optimize timer latency consider world switch time

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Subject: Re: [PATCH v4 1/2] KVM: LAPIC: Optimize timer latency consider world switch time
From: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Date: Wed, 3 Jul 2019 16:13:29 +0200
Cc: Radim Krčmář <rkrcmar@xxxxxxxxxx>, Sean Christopherson <sean.j.christopherson@xxxxxxxxx>
In-reply-to: <CANRm+Cz9Lc5rA7-2yLLX7wiemM-gdvWvQQdGVrvkYanYO9TwgA@mail.gmail.com>
References: <1560474949-20497-1-git-send-email-wanpengli@tencent.com> <1560474949-20497-2-git-send-email-wanpengli@tencent.com> <CANRm+CzUvTTOuYhsGErSDxdNSmxVr7o8d66DF0KOk4v3Meajmg@mail.gmail.com> <CANRm+Cw0vmqi4s4HhnMqs=hZZixHmU87CGO_ujTGoN_Osjx76g@mail.gmail.com> <CANRm+Cz9Lc5rA7-2yLLX7wiemM-gdvWvQQdGVrvkYanYO9TwgA@mail.gmail.com>
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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?

Paolo

Follow-Ups:
- Re: [PATCH v4 1/2] KVM: LAPIC: Optimize timer latency consider world switch time
  - From: Wanpeng Li

References:
- [PATCH v4 2/2] KVM: LAPIC: remove the trailing newline used in the fmt parameter of TP_printk
  - From: Wanpeng Li
- [PATCH v4 1/2] KVM: LAPIC: Optimize timer latency consider world switch time
  - From: Wanpeng Li
- Re: [PATCH v4 1/2] KVM: LAPIC: Optimize timer latency consider world switch time
  - From: Wanpeng Li
- Re: [PATCH v4 1/2] KVM: LAPIC: Optimize timer latency consider world switch time
  - From: Wanpeng Li
- Re: [PATCH v4 1/2] KVM: LAPIC: Optimize timer latency consider world switch time
  - From: Wanpeng Li

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