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: <20160624080852.GX30154@twins.programming.kicks-ass.net>
Date:	Fri, 24 Jun 2016 10:08:52 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Jirka Hladky <jhladky@...hat.com>
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

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.