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Re: [regression] cross core scheduling frequency drop bisected to 0c313cb20732

From "Rafael J. Wysocki" <rafael@kernel.org>
Newsgroups linux.kernel
Subject Re: [regression] cross core scheduling frequency drop bisected to 0c313cb20732
Date 2016-04-09 14:40 +0200
Message-ID <rm0lc-4YO-3@gated-at.bofh.it> (permalink)
References <rlx9w-7sb-5@gated-at.bofh.it> <rlyoW-8fi-11@gated-at.bofh.it> <rlyyC-8iG-19@gated-at.bofh.it> <rlLFv-16v-7@gated-at.bofh.it> <rlYW6-3XE-15@gated-at.bofh.it>
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On Sat, Apr 9, 2016 at 1:07 PM, Peter Zijlstra <peterz@infradead.org> wrote:
> On Fri, Apr 08, 2016 at 10:59:59PM +0200, Rafael J. Wysocki wrote:
>> On Friday, April 08, 2016 08:50:54 AM Mike Galbraith wrote:
>> > On Fri, 2016-04-08 at 08:45 +0200, Peter Zijlstra wrote:
>> >
>> > > Cute, I thought you used governor=performance for your runs?
>> >
>> > I do, and those numbers are with it thus set.
>>
>> Well, this is a trade-off.
>>
>> 4.5 introduced a power regression here so this one goes back to the previous
>> state of things.
>
> Just for my elucidation; how can gov=performance have a 'power'
> regression?

Because of what is used as the "default" idle state most of the time.

C1 was used before 4.5 and that changed to polling in 4.5.

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[regression] cross core scheduling frequency drop bisected to  0c313cb20732 Mike Galbraith <umgwanakikbuti@gmail.com> - 2016-04-08 07:30 +0200
  Re: [regression] cross core scheduling frequency drop bisected to  0c313cb20732 Peter Zijlstra <peterz@infradead.org> - 2016-04-08 08:50 +0200
    Re: [regression] cross core scheduling frequency drop bisected to  0c313cb20732 Mike Galbraith <umgwanakikbuti@gmail.com> - 2016-04-08 09:00 +0200
      Re: [regression] cross core scheduling frequency drop bisected to 0c313cb20732 "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-04-08 23:00 +0200
        RE: [regression] cross core scheduling frequency drop bisected to 0c313cb20732 "Doug Smythies" <dsmythies@telus.net> - 2016-04-09 00:20 +0200
          Re: [regression] cross core scheduling frequency drop bisected to  0c313cb20732 Mike Galbraith <umgwanakikbuti@gmail.com> - 2016-04-09 08:50 +0200
          RE: [regression] cross core scheduling frequency drop bisected to 0c313cb20732 "Doug Smythies" <dsmythies@telus.net> - 2016-04-09 09:20 +0200
            Re: [regression] cross core scheduling frequency drop bisected to  0c313cb20732 Mike Galbraith <umgwanakikbuti@gmail.com> - 2016-04-09 09:30 +0200
          Re: [regression] cross core scheduling frequency drop bisected to  0c313cb20732 Peter Zijlstra <peterz@infradead.org> - 2016-04-09 13:10 +0200
        Re: [regression] cross core scheduling frequency drop bisected to  0c313cb20732 Mike Galbraith <umgwanakikbuti@gmail.com> - 2016-04-09 08:50 +0200
          Re: [regression] cross core scheduling frequency drop bisected to 0c313cb20732 "Rafael J. Wysocki" <rafael@kernel.org> - 2016-04-09 14:40 +0200
            Re: [regression] cross core scheduling frequency drop bisected to  0c313cb20732 Mike Galbraith <umgwanakikbuti@gmail.com> - 2016-04-09 17:20 +0200
              Re: [regression] cross core scheduling frequency drop bisected to  0c313cb20732 Mike Galbraith <umgwanakikbuti@gmail.com> - 2016-04-09 18:40 +0200
                Re: [regression] cross core scheduling frequency drop bisected to 0c313cb20732 "Rafael J. Wysocki" <rafael@kernel.org> - 2016-04-10 05:50 +0200
                RE: [regression] cross core scheduling frequency drop bisected to 0c313cb20732 "Doug Smythies" <dsmythies@telus.net> - 2016-04-10 09:20 +0200
                Re: [regression] cross core scheduling frequency drop bisected to  0c313cb20732 Mike Galbraith <umgwanakikbuti@gmail.com> - 2016-04-10 11:40 +0200
                Re: [regression] cross core scheduling frequency drop bisected to  0c313cb20732 Mike Galbraith <umgwanakikbuti@gmail.com> - 2016-04-10 17:00 +0200
        Re: [regression] cross core scheduling frequency drop bisected to  0c313cb20732 Peter Zijlstra <peterz@infradead.org> - 2016-04-09 13:10 +0200
          Re: [regression] cross core scheduling frequency drop bisected to 0c313cb20732 "Rafael J. Wysocki" <rafael@kernel.org> - 2016-04-09 14:40 +0200
            Re: [regression] cross core scheduling frequency drop bisected to  0c313cb20732 Mike Galbraith <umgwanakikbuti@gmail.com> - 2016-04-10 17:50 +0200
              Re: [regression] cross core scheduling frequency drop bisected to  0c313cb20732 Rik van Riel <riel@redhat.com> - 2016-04-10 22:30 +0200
                Re: [regression] cross core scheduling frequency drop bisected to  0c313cb20732 Mike Galbraith <umgwanakikbuti@gmail.com> - 2016-04-11 05:10 +0200
                Re: [regression] cross core scheduling frequency drop bisected to  0c313cb20732 Rik van Riel <riel@redhat.com> - 2016-04-11 14:40 +0200
                Re: [regression] cross core scheduling frequency drop bisected to 0c313cb20732 "Rafael J. Wysocki" <rafael@kernel.org> - 2016-04-11 15:30 +0200
                Re: [regression] cross core scheduling frequency drop bisected to  0c313cb20732 Rik van Riel <riel@redhat.com> - 2016-04-11 15:40 +0200

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