Could you try again with 2.4.4pre4 plus the below patch?
ftp://ftp.us.kernel.org/pub/linux/kernel/people/andrea/patches/v2.4/2.4.4pre2/rawio-3
You should experience also a quite noticeable improvement on both CPU usage and
disk I/O (also depends on the max size of a I/O request for your hardware disk
controller).
Andrea
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