From: "Steinar H. Gunderson" <sgunderson@bigfoot.com>
To: Mike Galbraith <umgwanakikbuti@gmail.com>
Cc: linux-kernel@vger.kernel.org,
Linus Torvalds <torvalds@linux-foundation.org>,
Peter Zijlstra <peterz@infradead.org>,
Thomas Gleixner <tglx@linutronix.de>
Subject: Re: bisected: futex regression >= 3.14 - was - Slowdown due to threads bouncing between HT cores
Date: Wed, 8 Oct 2014 18:23:13 +0200 [thread overview]
Message-ID: <20141008162313.GA38790@sesse.net> (raw)
In-Reply-To: <1412782664.5179.75.camel@marge.simpson.net>
On Wed, Oct 08, 2014 at 05:37:44PM +0200, Mike Galbraith wrote:
> Seems you opened a can of futex worms...
Awesome.
> I don't see that on the 2 x E5-2697 box I borrowed to take a peek. Once
> I got stockfish to actually run to completion by hunting down and brute
> force reverting the below, I see ~32 million nodes/sec throughput with
> 3.17 whether I use taskset or just let it do its thing.
Interesting. If you open up top, do you see (like me) the load being spread
out across multiple CPUs, or do they actually stay in place like they're
supposed to?
I suppose you run with Threads set to 28, right? (And not, say, 56.)
/* Steinar */
--
Homepage: http://www.sesse.net/
next prev parent reply other threads:[~2014-10-08 16:23 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-03 19:44 Slowdown due to threads bouncing between HT cores Steinar H. Gunderson
2014-10-03 21:11 ` Marc Burkhardt
2014-10-03 21:14 ` Steinar H. Gunderson
2014-10-04 9:22 ` Marc Burkhardt
2014-10-04 13:41 ` Andi Kleen
2014-10-04 14:12 ` Steinar H. Gunderson
2014-10-04 14:50 ` Chuck Ebbert
2014-10-05 11:19 ` Steinar H. Gunderson
2014-10-08 15:37 ` bisected: futex regression >= 3.14 - was - " Mike Galbraith
2014-10-08 16:14 ` Thomas Gleixner
2014-10-08 16:45 ` Steinar H. Gunderson
2014-10-08 17:52 ` Mike Galbraith
2014-10-08 16:23 ` Steinar H. Gunderson [this message]
2014-10-08 17:04 ` Linus Torvalds
2014-10-08 17:05 ` Steinar H. Gunderson
2014-10-08 17:59 ` Mike Galbraith
2014-10-24 15:25 ` Thomas Gleixner
2014-10-24 16:38 ` Mike Galbraith
2014-10-26 10:39 ` Steinar H. Gunderson
2014-10-26 13:16 ` Mike Galbraith
2014-10-26 13:58 ` Mike Galbraith
2014-10-26 14:11 ` Steinar H. Gunderson
2014-10-26 14:41 ` Mike Galbraith
2014-10-27 10:05 ` Mike Galbraith
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