linux-kernel - Re: [PATCH 0/6] kill-the-BKL/reiserfs3: performance improvements, faster than Bkl based scheme

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Date:	Sat, 2 May 2009 03:39:07 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	LKML <linux-kernel@...r.kernel.org>, Jeff Mahoney <jeffm@...e.com>,
	ReiserFS Development List <reiserfs-devel@...r.kernel.org>,
	Chris Mason <chris.mason@...cle.com>,
	Alexander Beregalov <a.beregalov@...il.com>,
	Alessio Igor Bogani <abogani@...ware.it>,
	Jonathan Corbet <corbet@....net>,
	Alexander Viro <viro@...iv.linux.org.uk>
Subject: Re: [PATCH 0/6] kill-the-BKL/reiserfs3: performance improvements,
	faster than Bkl based scheme

On Fri, May 01, 2009 at 04:44:16AM +0200, Frederic Weisbecker wrote:
> Hi,
> 
> This reiserfs patchset applies against latest tip:core/kill-the-BKL
> It adds various explicit write lock releases on specific sleeping sections.
> 
> A performance test with dbench on UP with 100 processus during 100 seconds
> gives the following results:
> 
> Locking		  Throughput 
> 
> Bkl:              11.2587 MB/s
> Write lock/Mutex: 12.5713 MB/s


I just tested on SMP with two CPU:

Write Lock/Mutex: Throughput 66.9269 MB/sec 100 procs
Bkl:              Throughput 71.9998 MB/sec 100 procs

So:

UP:  11% faster
SMP:  8% slower


I guess there is still some work to do :)

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