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.
next prev 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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