From: Tejun Heo <tj@kernel.org>
To: Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Andrew Morton <akpm@linux-foundation.org>,
Chris Mason <chris.m
Cc: linux-kernel@vger.kernel.org, linux-btrfs@vger.kernel.org
Subject: Re: [PATCH 2/2] mutex: Apply adaptive spinning on mutex_trylock()
Date: Fri, 25 Mar 2011 11:12:38 +0100 [thread overview]
Message-ID: <20110325101238.GC1409@htj.dyndns.org> (raw)
In-Reply-To: <20110324094151.GE12038@htj.dyndns.org>
Hello,
On Thu, Mar 24, 2011 at 10:41:51AM +0100, Tejun Heo wrote:
> USER SYSTEM SIRQ CXTSW THROUGHPUT
> SIMPLE 61107 354977 217 8099529 845.100 MB/sec
> SPIN 63140 364888 214 6840527 879.077 MB/sec
>
> On various runs, the adaptive spinning trylock consistently posts
> higher throughput. The amount of difference varies but it outperforms
> consistently.
I've been running more of these tests and am having doubts about the
consistency. It seems that, even on a fresh filesystem, some random
initial condition seems to have persistent effect on the whole run.
I'll run more tests and report back.
Thanks.
--
tejun
next prev parent reply other threads:[~2011-03-25 10:12 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-23 15:37 [RFC PATCH] mutex: Apply adaptive spinning on mutex_trylock() Tejun Heo
2011-03-23 15:40 ` Tejun Heo
2011-03-23 15:48 ` Linus Torvalds
2011-03-23 15:52 ` Tejun Heo
2011-03-23 19:46 ` Andrey Kuzmin
2011-03-24 8:18 ` Ingo Molnar
2011-03-25 3:24 ` Steven Rostedt
2011-03-25 10:29 ` Ingo Molnar
2011-03-24 9:41 ` [PATCH 1/2] Subject: mutex: Separate out mutex_spin() Tejun Heo
2011-03-24 9:41 ` [PATCH 2/2] mutex: Apply adaptive spinning on mutex_trylock() Tejun Heo
2011-03-25 3:39 ` Steven Rostedt
2011-03-25 4:38 ` Linus Torvalds
2011-03-25 6:53 ` Tejun Heo
2011-03-25 13:10 ` Steven Rostedt
2011-03-25 13:29 ` Steven Rostedt
2011-03-25 11:13 ` Andrey Kuzmin
2011-03-25 13:12 ` Steven Rostedt
2011-03-25 13:50 ` Andrey Kuzmin
2011-03-25 14:05 ` Steven Rostedt
2011-03-25 19:51 ` Ingo Molnar
2011-03-25 10:12 ` Tejun Heo [this message]
2011-03-25 10:31 ` Ingo Molnar
2011-03-29 16:37 ` Tejun Heo
2011-03-29 17:09 ` Tejun Heo
2011-03-29 17:37 ` Peter Zijlstra
2011-03-30 8:17 ` Tejun Heo
2011-03-30 11:29 ` Peter Zijlstra
2011-03-30 11:46 ` Chris Mason
2011-03-30 11:52 ` Peter Zijlstra
2011-03-30 11:59 ` Chris Mason
2011-03-24 9:42 ` [PATCH 1/2] Subject: mutex: Separate out mutex_spin() Tejun Heo
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