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Date: Sat, 2 May 2009 03:39:07 +0200
From: Frederic Weisbecker <fweisbec@gmail.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: LKML <linux-kernel@vger.kernel.org>, Jeff Mahoney <jeffm@suse.com>,
       ReiserFS Development List <reiserfs-devel@vger.kernel.org>,
       Chris Mason <chris.mason@oracle.com>,
       Alexander Beregalov <a.beregalov@gmail.com>,
       Alessio Igor Bogani <abogani@texware.it>,
       Jonathan Corbet <corbet@lwn.net>,
       Alexander Viro <viro@zeniv.linux.org.uk>
Subject: Re: [PATCH 0/6] kill-the-BKL/reiserfs3: performance improvements,
	faster than Bkl based scheme
Message-ID: <20090502013906.GA5331@nowhere>
References: <1241145862-21700-1-git-send-email-fweisbec@gmail.com>
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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 :)