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Date: Wed, 25 Jul 2007 16:35:07 -0400
From: Howard Goldstein <hg@queue.to>
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Subject: [resolved, naively] Re: geom vs ich through ar device - benchmarks?
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Howard Goldstein wrote:
> Has anyone done any benchmarks in desktop or server environment
> comparing geom with an ICH controller through the ar device in RAID1
> service?  Teh google, it seems to pick up grammar school math
> assignments lots of what may be relevant hits for fortunate speakers of
> German :(

In case it may help someone else I've some benchmarks to share.  These
are trivial and naive benchmarks since they test only one case which
probably is the worst case for geom.

Testbed: Pair of WDC3200AAKS 320gb SATA, freshly newfsd 10gb filesystem
mounted with softupdates, remounted after each test
P4 @ 3ghz on a P4P800 in 6.2-STABLE, single user mode, ICH5R controller
detects these SATA-II drives inexplicably as SATA-I

Naive test:  dd if=/dev/zero of=/fsundertest/tstfile bs=1m count=1000
*not including buffered stuff unwritten, the test simply reported dd's
idea of the transfer time*, and then the other way where it doesn't matter

 In firmware's RAID1                       Using the awesome gmirror
write 1gb: 13.275                             13.7
rd         12.9                               13.8

Of course after this I used gmirror...