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

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Date:	Sun, 26 Oct 2014 15:41:34 +0100
From:	Mike Galbraith <umgwanakikbuti@...il.com>
To:	"Steinar H. Gunderson" <sgunderson@...foot.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 Sun, 2014-10-26 at 15:11 +0100, Steinar H. Gunderson wrote: 
> On Sun, Oct 26, 2014 at 02:58:36PM +0100, Mike Galbraith wrote:
> > Can you try the below?
> 
> I can bake it into the kernel the next time I boot, but that is unlikely to
> be anytime soon, I'm afraid. I'm maybe a bit surprised nobody else can
> reproduce my issue; I assume it won't help if I give out shell access
> somehow.

Sure it would, any bug I can get my hands on, I can toss rocks and
sticks at until one of us gives up :)  Trouble is me having time to go
play with your box, and you trusting me to not do naughty things while
there, /me nearly always being in godmode (permission denied allergy),
that would be a problem.

-Mike



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