linux-kernel - Re: Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks against 4.6 kernel

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Message-ID: <CAE4VaGCm-YOs4Fzv4QmXjxML9FPGUp8cSnwbpcJ5wi6tN0QZpA@mail.gmail.com>
Date:	Fri, 24 Jun 2016 10:20:48 +0200
From:	Jirka Hladky <jhladky@...hat.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
	Kamil Kolakowski <kkolakow@...hat.com>
Subject: Re: Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and
 SPECjvm2008 benchmarks against 4.6 kernel

I had a look and

CONFIG_SCHED_AUTOGROUP=y

is used both in RHEL6 and RHEL7.  We compile the upstream kernels with
config derived from RHEL7 config file.

Jirka

On Fri, Jun 24, 2016 at 10:08 AM, Peter Zijlstra <peterz@...radead.org> wrote:
> On Fri, Jun 24, 2016 at 09:44:41AM +0200, Jirka Hladky wrote:
>> I have double checked default settings and
>>
>> kernel.sched_autogroup_enabled
>>
>> is by default ON both in 4.6 and 4.7 kernel.
>
> Yeah, if you enable that CONFIG its default enabled. In any case, I'll
> go trawl through the cgroup code now. I spend yesterday looking at the
> 'wrong' part things.
>
>