comparing FreeBSD to linux

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I have evaluated which is better in terms cpu load when dealing with raid.
FreeBSD vinum's or linux raid.
When i issued a huge amount of io's read to linux raid i got 93% cpu
load ( 7% idle),
while i having 10% cpu load  ( 90% idle ) in the freebsd.

I need to switch to linux from freebsd. I am using in linux 2.6.6 kernel .
is problem is a known issue in linux , is it fixed ?

--
Raz
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