linux-kernel - Re: bisected: futex regression >= 3.14 - was - Slowdown due to threads bouncing between HT cores

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Message-ID: <20141026103918.GA5259@sesse.net>
Date:	Sun, 26 Oct 2014 11:39:18 +0100
From:	"Steinar H. Gunderson" <sgunderson@...foot.com>
To:	Mike Galbraith <umgwanakikbuti@...il.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: bisected: futex regression >= 3.14 - was - Slowdown due to
 threads bouncing between HT cores

On Fri, Oct 24, 2014 at 06:38:41PM +0200, Mike Galbraith wrote:
>>> Whew, good, futex.c is hard.  Heads up chess guys <punt>. 
>> I wonder whether the barrier fix which got into 3.17 late fixes that
>> issue as well.
> Yes, it did.

This is only about the lockup, right, not that the threads bounce around a
lot and make things slower?

/* Steinar */
-- 
Homepage: http://www.sesse.net/
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