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    SubjectRe: [PATCH] 2.5.3-pre1 ata-253p1-2
    On Fri, Jan 18 2002, Anton Altaparmakov wrote:
    > >> You have to give Jens the credit for gluing it togather, because there
    > >was
    > >> no way I would have figured out the suttle issues of BIO. There are
    > >> serveral additions need to fix all the archs so hope to have something
    > >> today.
    > >
    > >Well, good work to both of you. It is an excellent driver. Please
    > >submit it for pre2.
    > I second that. 2.5.3-pre1 + 2nd patch from Jens + daft compile fixes is
    > running fine on my Athlon/VIA chipset both UDMA100 and PIO4 on my 60GXP
    > drive! Brilliant work guys!


    > There is only one odd thing and that is that PIO transfers are slower in
    > 2.5.3-pre1 + 2nd patch from Jens + daft compile fixes compared to in
    > 2.5.2-pre11-vanilla.
    > PIO mode, hdparm -t /dev/hda:
    > on 2.5.3-pre1 + 2nd Jens patch: 4.62MB/s
    > on 2.5.2-pre11 vanilla: 7.36MB/s
    > DMA transfers are the same with both kernels, peaking at 38-39MB/s which is
    > I believe the theoretical upper limit for the 60GXP so there was not much
    > room for visible improvement (2.5.3-pre1 is slightly faster in that it gave
    > in three tests 38.79MB/s while 2.5.2-pre11 gave in three tests 38.32MB/s,
    > so if you believe those ACB is .4 MB/s faster).
    > I don't care that PIO has become slower, all modern devices are happy with
    > UDMA, and so am I. (-: But I thought I should mention it.

    Interesting, I dunno where this performance decrease comes from right
    now. But I'm sure we can make it go at least as fast as 2.5.2-pre11, the
    primary concern right now was solid PIO + mult mode again, and I think
    we've achieved that.

    > Note that 2.5.3-pre1 now survives find . -type f -exec md5sum "{}" \; both
    > in PIO and UDMA mode so it can really be considered stable on UP system.

    Great, thanks for testing.

    Jens Axboe

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