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    SubjectRe: Absolutely horrid IDE performance...
    Brian Macy wrote:
    ..
    > On /dev/hda:
    > hdparm gives 6.68meg/sec
    ..
    > On /dev/sda (a junker Seagate WSCSI on the Mylex controller:
    > hdparm varies greatly between 2.5meg/sec and 4.5meg/sec
    > time dd... gives 4.6meg/sec
    >
    > Can anyone explain the discrepancy? I can't see why there would be such a
    > huge difference. From what I've experienced with 95/NT machines, the IBM
    > UDMA drives are very fast. Linux even shows the system time required to be
    > reasonable between SCSI/IDE... it just seems like the drive is just running
    > slow (I thought it might be CPU overhead).

    Nope. CPU overhead is less for IDE than for SCSI.

    Upgrade to hdparm-3.5 so that you can display the
    drive's current UDMA mode. The BIOS may have selected mode0
    instead of the faster mode2.

    Ooops.. wait a minute.. you said:

    >ide: i82371 PIIX (Triton) on PCI bus 0 function 57

    The Intel PIIX chip does not support UDMA.

    Are you not running a 2.1.xxx kernel??? You should be!
    --
    mlord@pobox.com

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