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[Rob Mueller]

> Reiser also has a nolog option, which I didn't try.  There are quite a
> few more knobs to tweak for all the filesystems.

Try mounting with:

noatime,nodiratime,notail,data=journal

That's what we use and consistently get the best performance with. I've 
posted previous experiences and thoughts with filesystems here:

http://www.irbs.net/internet/info-cyrus/0412/0042.html
http://lists.andrew.cmu.edu/pipermail/info-cyrus/2006-October/024119.html

Rob