Re: [PATCH v5] KVM: halt-polling: poll for the upcoming fire timers

From	yunhong jiang <yunhong.jiang@linux.intel.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH v5] KVM: halt-polling: poll for the upcoming fire timers
Date	2016-05-28 02:30 +0200
Message-ID	<rDAiC-1Y8-37@gated-at.bofh.it> (permalink)
References	<rCx3s-3y6-3@gated-at.bofh.it> <rD0Ia-5eg-25@gated-at.bofh.it> <rDaoa-2BP-21@gated-at.bofh.it> <rDmyZ-1JJ-9@gated-at.bofh.it>
Organization	otc

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On Fri, 27 May 2016 11:49:26 +0200
Paolo Bonzini <pbonzini@redhat.com> wrote:

> 
> 
> On 26/05/2016 22:33, yunhong jiang wrote:
> > On Thu, 26 May 2016 12:26:27 +0200
> > Paolo Bonzini <pbonzini@redhat.com> wrote:
> > 
> >>
> >>
> >> On 25/05/2016 04:47, Wanpeng Li wrote:
> >>> From: Wanpeng Li <wanpeng.li@hotmail.com>
> >>>
> >>> If an emulated lapic timer will fire soon(in the scope of 10us the
> >>> base of dynamic halt-polling, lower-end of message passing
> >>> workload latency TCP_RR's poll time < 10us) we can treat it as a
> >>> short halt, and poll to wait it fire, the fire callback
> >>> apic_timer_fn() will set KVM_REQ_PENDING_TIMER, and this flag
> >>> will be check during busy poll. This can avoid context switch
> >>> overhead and the latency which we wake up vCPU.
> >>
> >> As discussed on IRC, I would like to understand why the adaptive
> > 
> > Glad to know the IRC channel. Is #kvm channel on freenode the IRC
> > you are talking about?
> 
> No, it's #qemu on irc.oftc.net

Thanks for the information.

--jyh

> 
> Thanks,
> 
> Paolo

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[PATCH v5] KVM: halt-polling: poll for the upcoming fire timers Wanpeng Li <kernellwp@gmail.com> - 2016-05-25 04:50 +0200
  Re: [PATCH v5] KVM: halt-polling: poll for the upcoming fire timers Paolo Bonzini <pbonzini@redhat.com> - 2016-05-26 12:30 +0200
    Re: [PATCH v5] KVM: halt-polling: poll for the upcoming fire timers Paolo Bonzini <pbonzini@redhat.com> - 2016-05-26 12:40 +0200
      Re: [PATCH v5] KVM: halt-polling: poll for the upcoming fire timers Wanpeng Li <kernellwp@gmail.com> - 2016-05-26 13:30 +0200
    Re: [PATCH v5] KVM: halt-polling: poll for the upcoming fire timers yunhong jiang <yunhong.jiang@linux.intel.com> - 2016-05-26 22:50 +0200
      Re: [PATCH v5] KVM: halt-polling: poll for the upcoming fire timers Paolo Bonzini <pbonzini@redhat.com> - 2016-05-27 11:50 +0200
        Re: [PATCH v5] KVM: halt-polling: poll for the upcoming fire timers yunhong jiang <yunhong.jiang@linux.intel.com> - 2016-05-28 02:30 +0200

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