linux-kernel - Re: [lkp] [x86/build] b2c51106c75: -18.1% will-it-scale.per_process

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Message-ID: <20150805083858.GA21506@gmail.com>
Date:	Wed, 5 Aug 2015 10:38:58 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	kernel test robot <ying.huang@...el.com>
Cc:	Andy Lutomirski <luto@...nel.org>, lkp@...org,
	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Thomas Gleixner <tglx@...utronix.de>,
	Denys Vlasenko <dvlasenk@...hat.com>
Subject: Re: [lkp] [x86/build] b2c51106c75: -18.1%
 will-it-scale.per_process_ops


* kernel test robot <ying.huang@...el.com> wrote:

> FYI, we noticed the below changes on
> 
> git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86/asm
> commit b2c51106c7581866c37ffc77c5d739f3d4b7cbc9 ("x86/build: Fix detection of GCC -mpreferred-stack-boundary support")

Does the performance regression go away reproducibly if you do:

   git revert b2c51106c7581866c37ffc77c5d739f3d4b7cbc9

?

Thanks,

	Ingo
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