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    SubjectRe: Absolutely horrid IDE performance...
    On Thu, 26 Nov 1998, Mark Lord wrote:

    > Nate Thompson wrote:

    > The PIIX4 chip supports UDMA, but not the PIIX or PIIX3
    > (there are multiple versions of Intel "PIIX" chips,
    > and the first version, i82371FB, is called the "PIIX").

    The IDE chip on my older PC-Parnter 520N VX motherboard supports standard
    busmastering.. but not UDMA..

    seen here:

    ide: i82371 PIIX (Triton) on PCI bus 0 function 57
    ide0: BM-DMA at 0xffa0-0xffa7
    ide1: BM-DMA at 0xffa8-0xffaf
    hda: QUANTUM BIGFOOT_CY4320A, 4134MB w/67kB Cache, CHS=527/255/63, DMA
    hdc: Conner Peripherals 170MB - CP30174E, 161MB w/32kB Cache,

    /proc/pci shows the IDE bus on this board as:

    Bus 0, device 7, function 1:
    IDE interface: Intel 82371SB PIIX3 IDE (rev 0).
    Medium devsel. Fast back-to-back capable. Master Capable.
    I/O at 0xffa0.

    The QUANTUM drive will support UDMA but not with my motherboard..
    I do however get 6meg or there abouts out of it..
    (which is pretty good for a Quantum Bigfoot)

    the BIOS is set for PIO mode 4, BusMastering enabled, 32bit access and
    Large block transfer.

    [22:06:12] root:~# hdparm -Tt /dev/hda

    Timing buffer-cache reads: 128 MB in 3.48 seconds =36.78 MB/sec
    Timing buffered disk reads: 64 MB in 9.31 seconds = 6.87 MB/se

    and this is on a P166 with 64meg EDO ram..
    so if you have a faster machine, with a newer motherboard and are getting
    less that that really, your drive is either slow, or the IDE controller on
    it is a little old..

    Regards, Jim.

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