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Re: [PATCH 3/4] sched: introduce synchronized idle injection

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From Ingo Molnar <mingo@kernel.org>
Newsgroups linux.kernel
Subject Re: [PATCH 3/4] sched: introduce synchronized idle injection
Date Fri, 27 Nov 2015 10:20:02 +0100
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X-Original-Cc Jacob Pan <jacob.jun.pan@linux.intel.com>, Ingo Molnar <mingo@redhat.com>, Thomas Gleixner <tglx@linutronix.de>, John Stultz <john.stultz@linaro.org>, LKML <linux-kernel@vger.kernel.org>, Arjan van de Ven <arjan@linux.intel.com>, Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>, Len Brown <len.brown@intel.com>, Rafael Wysocki <rafael.j.wysocki@intel.com>, Eduardo Valentin <edubezval@gmail.com>, Paul Turner <pjt@google.com>
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* Peter Zijlstra <peterz@infradead.org> wrote:

> On Wed, Nov 18, 2015 at 09:36:22AM +0100, Ingo Molnar wrote:
> > What will such throttling do to latencies, as observed by user-space tasks? What's 
> > the typical expected frequency of the throttling frequency that you are targeting?
> 
> The default has 5ms (iirc) of forced idle, so depending on what you do,
> noticeable to outright painful.

That's absolutely painful!

Thanks,

	Ingo
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Thread

Re: [PATCH 3/4] sched: introduce synchronized idle injection Ingo Molnar <mingo@kernel.org> - 2015-11-18 09:40 +0100
  Re: [PATCH 3/4] sched: introduce synchronized idle injection Peter Zijlstra <peterz@infradead.org> - 2015-11-18 11:40 +0100
    Re: [PATCH 3/4] sched: introduce synchronized idle injection Morten Rasmussen <morten.rasmussen@arm.com> - 2015-11-18 13:30 +0100
      Re: [PATCH 3/4] sched: introduce synchronized idle injection Peter Zijlstra <peterz@infradead.org> - 2015-11-18 14:00 +0100
        Re: [PATCH 3/4] sched: introduce synchronized idle injection Morten Rasmussen <morten.rasmussen@arm.com> - 2015-11-18 15:10 +0100
          Re: [PATCH 3/4] sched: introduce synchronized idle injection Jacob Pan <jacob.jun.pan@linux.intel.com> - 2015-11-18 16:00 +0100
            Re: [PATCH 3/4] sched: introduce synchronized idle injection Morten Rasmussen <morten.rasmussen@arm.com> - 2015-11-18 16:10 +0100
              Re: [PATCH 3/4] sched: introduce synchronized idle injection Jacob Pan <jacob.jun.pan@linux.intel.com> - 2015-11-18 16:20 +0100
                Re: [PATCH 3/4] sched: introduce synchronized idle injection Thomas Gleixner <tglx@linutronix.de> - 2015-11-18 16:30 +0100
                Re: [PATCH 3/4] sched: introduce synchronized idle injection Jacob Pan <jacob.jun.pan@linux.intel.com> - 2015-11-18 20:00 +0100
                Re: [PATCH 3/4] sched: introduce synchronized idle injection Morten Rasmussen <morten.rasmussen@arm.com> - 2015-11-18 17:10 +0100
    Re: [PATCH 3/4] sched: introduce synchronized idle injection Ingo Molnar <mingo@kernel.org> - 2015-11-27 10:20 +0100
  Re: [PATCH 3/4] sched: introduce synchronized idle injection Jacob Pan <jacob.jun.pan@linux.intel.com> - 2015-11-18 15:20 +0100
    Re: [PATCH 3/4] sched: introduce synchronized idle injection Ingo Molnar <mingo@kernel.org> - 2015-11-27 10:20 +0100
  Re: [PATCH 3/4] sched: introduce synchronized idle injection Arjan van de Ven <arjan@linux.intel.com> - 2015-11-18 15:30 +0100

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