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From: "Martin J. Bligh" <mbligh@aracnet.com>
To: Andrew Morton <akpm@digeo.com>,
	William Lee Irwin III <wli@holomorphy.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: 2.5.38-mm2 dbench $N times
Date: Tue, 24 Sep 2002 23:03:50 -0700	[thread overview]
Message-ID: <297318451.1032908628@[10.10.2.3]> (raw)
In-Reply-To: <3D9103EB.FC13A744@digeo.com>

>> Not sure. This is boot bay SCSI crud, but single-disk FC looks
>> *worse* for no obvious reason. Multiple disk tests do much better
>> (about matching the el-scruffo PC numbers above).
> 
> dbench 16 on that sort of machine is a memory bandwidth test.
> And a dcache lock exerciser.  It basically doesn't touch the
> disk.  Something very bad is happening.

Does dbench have any sort of CPU locality between who read it 
into pagecache, and who read it out again? If not, you stand
7/8 chance of being on the wrong node, and getting 1/20 of the
mem bandwidth ....

M.


  parent reply	other threads:[~2002-09-25  6:00 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2002-09-24 13:20 William Lee Irwin III
2002-09-24 17:47 ` Andrew Morton
2002-09-25  0:18   ` William Lee Irwin III
2002-09-25  0:25     ` William Lee Irwin III
2002-09-25  0:31     ` Andrew Morton
2002-09-25  0:39       ` William Lee Irwin III
2002-09-25  0:46         ` Andrew Morton
2002-09-25  1:08       ` Dave Hansen
2002-09-25  1:17         ` William Lee Irwin III
2002-09-25  6:03       ` Martin J. Bligh [this message]
2002-09-25 18:51         ` Andrew Theurer
2002-09-25 20:57           ` Martin J. Bligh
2002-09-25 21:05             ` Andrew Theurer
2002-09-25 23:57           ` William Lee Irwin III

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