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    SubjectRe: poor SATA performance under 2.6.11 (with < 2.6.11 is OK)?
    Tomasz Torcz wrote:
    > On Thu, Apr 14, 2005 at 06:23:30PM +0200, Tomasz Chmielewski wrote:
    >
    >>I have a Silicon Image SIL3112A SATA PCI controller + 2x 200GB, 8MB
    >>Barracuda drives.
    >
    >
    > Bad combination.

    OK, from the link you gave I can see that there might be some problems
    with SIL3112 controller + seagate disks...


    >>The performance under 2.6 kernels is *very* poor (Timing buffered disk
    >>reads never more than 20 MB/sec); under 2.4 it runs quite fine (Timing
    >>buffered disk reads around 60 MB/sec).
    >
    >
    > 2.4 risk data corruption. 2.6 sata_sil.c contains blacklist for some
    > driver-controller combination.
    >
    > See: http://home-tj.org/m15w/

    ...but this link just doesn't explain why performance is sooo bad with
    2.6.11.x kernels (Timing buffered disk reads at 10-20 MB/sec), and is
    just OK with older 2.6 kernels (Timing buffered disk reads even at about
    100 MB/sec with 2.6.8.1).

    any clue?

    or should I wait for 2.6.11.7 (?), where it should be corrected?


    Tomek


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