From: Andrew Morton <akpm@osdl.org>
To: Joel Schopp <jschopp@austin.ibm.com>
Cc: olof@lixom.net, mingo@elte.hu, linux-kernel@vger.kernel.org,
torvalds@osdl.org, arjan@infradead.org, nico@cam.org,
jes@trained-monkey.org, viro@ftp.linux.org.uk, oleg@tv-sign.ru,
dhowells@redhat.com, alan@lxorguk.ukuu.org.uk, hch@infradead.org,
ak@suse.de, rmk+lkml@arm.linux.org.uk, anton@samba.org,
linuxppc64-dev@ozlabs.org
Subject: Re: PowerPC fastpaths for mutex subsystem
Date: Sat, 7 Jan 2006 14:37:22 -0800 [thread overview]
Message-ID: <20060107143722.25afd85d.akpm@osdl.org> (raw)
In-Reply-To: <43BFFF1D.7030007@austin.ibm.com>
Joel Schopp <jschopp@austin.ibm.com> wrote:
>
> This is the second pass at optimizing the fastpath for the new mutex subsystem
> on PowerPC. I think it is ready to be included in the series with the other
> mutex patches now. Tested on a 4 core (2 SMT threads/core) Power5 machine with
> gcc 3.3.2.
>
> Test results from synchro-test.ko:
>
> All tests run for default 5 seconds
> Threads semaphores mutexes mutexes+attached
> 1 63,465,364 58,404,630 62,109,571
> 4 58,424,282 35,541,297 37,820,794
> 8 40,731,668 35,541,297 40,281,768
> 16 38,372,769 37,256,298 41,751,764
> 32 38,406,895 36,933,675 38,731,571
> 64 37,232,017 36,222,480 40,766,379
>
Doens't this mean that the sped-up mutexes are still slower than semaphores?
next prev parent reply other threads:[~2006-01-07 22:38 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-01-04 14:41 [patch 00/21] mutex subsystem, -V14 Ingo Molnar
2006-01-04 23:45 ` Joel Schopp
2006-01-05 2:38 ` Nicolas Pitre
2006-01-05 2:51 ` Linus Torvalds
2006-01-05 3:21 ` Nick Piggin
2006-01-05 3:39 ` Anton Blanchard
2006-01-05 18:04 ` Jesse Barnes
2006-01-05 14:40 ` Ingo Molnar
2006-01-05 16:21 ` Linus Torvalds
2006-01-05 22:03 ` Ingo Molnar
2006-01-05 22:17 ` Linus Torvalds
2006-01-05 22:43 ` Ingo Molnar
2006-01-06 3:49 ` Keith Owens
2006-01-06 7:34 ` Denis Vlasenko
2006-01-05 14:35 ` Ingo Molnar
2006-01-05 16:42 ` Joel Schopp
2006-01-05 22:21 ` Ingo Molnar
2006-01-05 23:06 ` Joel Schopp
2006-01-05 23:26 ` Linus Torvalds
2006-01-05 23:36 ` Joel Schopp
2006-01-05 23:42 ` Ingo Molnar
2006-01-06 0:29 ` Olof Johansson
2006-01-07 17:49 ` PowerPC fastpaths for mutex subsystem Joel Schopp
2006-01-07 22:37 ` Andrew Morton [this message]
2006-01-08 7:43 ` Anton Blanchard
2006-01-08 8:00 ` Andrew Morton
2006-01-08 8:23 ` Anton Blanchard
2006-01-09 11:13 ` David Howells
2006-01-08 9:48 ` Ingo Molnar
2006-01-10 22:31 ` Joel Schopp
2006-01-10 23:09 ` Ingo Molnar
2006-01-11 10:52 ` Ingo Molnar
2006-01-11 17:44 ` Joel Schopp
2006-01-08 10:43 ` Ingo Molnar
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