linux-kernel - Re: Kernel v4.7-rc5 - performance degradation upto 40% after disabling and re-enabling a core

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Message-ID: <20160629084637.GV30921@twins.programming.kicks-ass.net>
Date:	Wed, 29 Jun 2016 10:46:37 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Jirka Hladky <jhladky@...hat.com>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	Kamil Kolakowski <kkolakow@...hat.com>,
	Ingo Molnar <mingo@...hat.com>, jplozi@...ce.fr,
	Alexandra Fedorova <sasha@....ubc.ca>,
	Baptiste Lepers <baptiste.lepers@...il.com>
Subject: Re: Kernel v4.7-rc5 - performance degradation upto 40% after
 disabling and re-enabling a core

On Wed, Jun 29, 2016 at 01:15:17AM +0200, Jirka Hladky wrote:
> Hello,
> 
> on NUMA enabled server equipped with 4 Intel E5-4610 v2 CPUs we
> observe following performance degradation:

Do you have cluster on die enabled on that machine? If you disable it,
does it still reproduce?