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    SubjectRe: [git patches] IDE update
    On Tue, Jul 05 2005, Ondrej Zary wrote:
    > Jens Axboe wrote:
    > >On Tue, Jul 05 2005, Ondrej Zary wrote:
    > >
    > >>André Tomt wrote:
    > >>
    > >>>Al Boldi wrote:
    > >>>
    > >>>
    > >>>>Bartlomiej Zolnierkiewicz wrote: {
    > >>>>
    > >>>>
    > >>>>>>>On 7/4/05, Al Boldi <a1426z@gawab.com> wrote:
    > >>>>>>>Hdparm -tT gives 38mb/s in 2.4.31
    > >>>>>>>Cat /dev/hda > /dev/null gives 2% user 33% sys 65% idle
    > >>>>>>>
    > >>>>>>>Hdparm -tT gives 28mb/s in 2.6.12
    > >>>>>>>Cat /dev/hda > /dev/null gives 2% user 25% sys 0% idle 73% IOWAIT
    > >>>
    > >>>
    > >>>The "hdparm doesn't get as high scores as in 2.4" is a old discussed to
    > >>>death "problem" on LKML. So far nobody has been able to show it affects
    > >>>anything but that pretty useless quasi-benchmark.
    > >>>
    > >>
    > >>No, it's not a problem with hdparm. hdparm only shows that there is
    > >>_really_ a problem:
    > >>
    > >>2.6.12
    > >>root@pentium:/home/rainbow# time dd if=/dev/hda of=/dev/null bs=512
    > >>count=1048576
    > >>1048576+0 records in
    > >>1048576+0 records out
    > >>
    > >>real 0m32.339s
    > >>user 0m1.500s
    > >>sys 0m14.560s
    > >>
    > >>2.4.26
    > >>root@pentium:/home/rainbow# time dd if=/dev/hda of=/dev/null bs=512
    > >>count=1048576
    > >>1048576+0 records in
    > >>1048576+0 records out
    > >>
    > >>real 0m23.858s
    > >>user 0m1.750s
    > >>sys 0m15.180s
    > >
    > >
    > >Perhaps some read-ahead bug. What happens if you use bs=128k for
    > >instance?
    > >
    > Nothing - it's still the same.
    >
    > root@pentium:/home/rainbow# time dd if=/dev/hda of=/dev/null bs=128k
    > count=4096
    > 4096+0 records in
    > 4096+0 records out
    >
    > real 0m32.832s
    > user 0m0.040s
    > sys 0m15.670s

    Can you post full dmesg of 2.4 and 2.6 kernel boot? What does hdparm
    -I/-i say for both kernels?

    --
    Jens Axboe

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