slow random raid5 access?

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I'm have a new md raid5 array, and have been trying to break it in and tweak 
it a little. But random read or write are rather slow when using small record 
sizes:

http://pastebin.ca/1441414

Is that normal? And is there a way to speed it up without significantly 
slowing down sequential access?

-- 
Thomas Fjellstrom
tfjellstrom@xxxxxxx
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