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    SubjectRe: Silicon Image 3112A SATA trouble
    Jens Axboe wrote:
    > On Sun, Nov 30 2003, Bartlomiej Zolnierkiewicz wrote:
    >>Hmm. actually I was under influence that we have generic ioctls in 2.6.x,
    >>but I can find only BLKSECTGET, BLKSECTSET was somehow lost. Jens?
    >
    >
    > Probably because it's very dangerous to expose, echo something too big
    > and watch your data disappear.


    IMO, agreed.

    Max KB per request really should be set by the driver, as it's a
    hardware-specific thing that (as we see :)) is often errata-dependent.

    Tangent: My non-pessimistic fix will involve submitting a single sector
    DMA r/w taskfile manually, then proceeding with the remaining sectors in
    another r/w taskfile. This doubles the interrupts on the affected
    chipset/drive combos, but still allows large requests. I'm not terribly
    fond of partial completions, as I feel they add complexity, particularly
    so in my case: I can simply use the same error paths for both the
    single-sector taskfile and the "everything else" taskfile, regardless of
    which taskfile throws the error.

    (thinking out loud) Though best for simplicity, I am curious if a
    succession of "tiny/huge" transaction pairs are efficient? I am hoping
    that the drive's cache, coupled with the fact that each pair of
    taskfiles is sequentially contiguous, will not hurt speed too much over
    a non-errata configuration...

    Jeff



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