slow raid5 performance kernel 2.6 vs 2.4

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Hi,

system :

P4 2.4GHz HT, 1GB DDR
8*  S-ATA 250GB Hitachi on 2 Si3114 controllers

bonnie performance with 2.4 :
block input 126MB/sec

with 2.6 :
block input 90MB/sec

saw another posting about slow read performance with raid5 and 2.6
any ideas yet how to fix this ?


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