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    SubjectRAID-0 read perf. decrease after 2.4.20

    Hello All!

    Has anyone else experienced a drastic drop in read performance on software
    RAID-0 with post 2.4.20 kernels? We have a few Athlon XP's here at our
    lab with double IDE disks on different channels set up as RAID-0. Some
    bonnie++ benchmark results with various kernels, on the same machine
    (Athlon XP 2400+, 2 GHz, 1.5 GB RAM, VIA chipset, 2*Maxtor 120 GB
    write read
    2.4.20-ac1: 88,000 135,000 K/sec
    2.4.21-pre7: 93,000 75,000
    2.4.22-ac4: 94,000 82,000

    So the write speed has gone up a bit, but the read speed performance has
    plunged. Any ideas on what happened between 2.4.20 and 2.4.21 and what to
    do about it? I'm eagerly awaiting suggestions, good read speed is quite
    critical for many of our calculations :-) I will of course provide more
    details if necessary.

    Have a nice day,
    Mikael J.
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