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Re: [PATCH 0/6] sched/fair: Compute capacity invariant load/utilization tracking

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On Mon, Aug 31, 2015 at 11:24:49AM +0200, Peter Zijlstra wrote:

> A quick run here gives:
> 
> IVB-EP (2*20*2):

As noted by someone; that should be 2*10*2, for a total of 40 cpus in
this machine.

> 
> perf stat --null --repeat 10 -- perf bench sched messaging -g 50 -l 5000
> 
> Before:				After:
> 5.484170711 ( +-  0.74% )	5.590001145 ( +-  0.45% )
> 
> Which is an almost 2% slowdown :/
> 
> I've yet to look at what happens.

OK, so it appears this is link order nonsense. When I compared profiles
between the series, the one function that had significant change was
skb_release_data(), which doesn't make much sense.

If I do a 'make clean' in front of each build, I get a repeatable
improvement with this patch set (although how much of that is due to the
patches itself or just because of code movement is as yet undetermined).

I'm of a mind to apply these patches; with two patches on top, which
I'll post shortly.
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Re: [PATCH 0/6] sched/fair: Compute capacity invariant  load/utilization tracking Peter Zijlstra <peterz@infradead.org> - 2015-08-31 11:30 +0200
  Re: [PATCH 0/6] sched/fair: Compute capacity invariant  load/utilization tracking Dietmar Eggemann <dietmar.eggemann@arm.com> - 2015-09-02 12:00 +0200
  Re: [PATCH 0/6] sched/fair: Compute capacity invariant  load/utilization tracking Peter Zijlstra <peterz@infradead.org> - 2015-09-07 14:50 +0200
    Re: [PATCH 0/6] sched/fair: Compute capacity invariant  load/utilization tracking Peter Zijlstra <peterz@infradead.org> - 2015-09-07 15:30 +0200
    Re: [PATCH 0/6] sched/fair: Compute capacity invariant  load/utilization tracking Peter Zijlstra <peterz@infradead.org> - 2015-09-07 15:30 +0200
    Re: [PATCH 0/6] sched/fair: Compute capacity invariant  load/utilization tracking Dietmar Eggemann <dietmar.eggemann@arm.com> - 2015-09-07 16:50 +0200
      [tip:sched/core] sched/fair: Defer calling scaling functions tip-bot for Dietmar Eggemann <tipbot@zytor.com> - 2015-09-13 13:10 +0200

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