Date: Thu, 18 Apr 2002 18:18:43 +1000
From: Anton Blanchard <anton@samba.org>
To: linux-kernel@vger.kernel.org
Cc: akpm@zip.com.au, hannal@us.ibm.com
Subject: 12 way dbench analysis: 2.5.9, dalloc and fastwalkdcache 
Message-ID: <20020418081843.GE4209@krispykreme>
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Hi,

Its about time I took to the kernel with the dbench stick. The following
results were done on a 12 way ppc64 machine with 250MHz cpus. I tested
2.5.9, 2.5.9 with Andrew Morton's dalloc work and Hanna Linder's fast
walk dcache patch. The results can be found at:

http://samba.org/~anton/linux/2.5.9/

A few things to note:

1. On 2.5.9, lru_list_lock contention starts to cut in at 4 cpus.
Andrew's dalloc work gets rid of this bottleneck completely. Its fantastic
stuff!

2. The dcache lock starts to cut in at 6 cpus, and Hanna's patch reduces
the contention a lot.

Things look pretty good right out to 12 way with these patches, I'll try
and get some runs on a larger SMP next.

Anton
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