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    SubjectRe: IDE-DMA strangeness (another one)
    On Tue, 1 Dec 1998, Alex Buell wrote:
    > On Tue, 1 Dec 1998, Rik van Riel wrote:
    > > With this move I saw in improvement (hdparm -t) from 3
    > > to 8.4 (!) MB/second... Now I wonder what kind of bug
    > > in the Linux I/O subsystem could hold performance back
    > > _that_ badly.
    > Makes a lot of sense if your old IDE disk was PIO only and the newer
    > IDE uses DMA.

    All IDE devices in my box are DMA2 capable.

    > My machine exhibited the same speedup when I swapped around my old
    > PIO IDE and my spankin' new UMDA IDE hard disks. (It's stuck in DMA
    > though as PIIX3 chipset doesn't support UDMA - guess I'll have to
    > buy a Promise UDMA33 controller someday!)

    I'm working with an (apparently buggy) PIIX mobo. It's
    certainly fast enough not to be saturated by the HDs
    or the CD.


    Rik -- now completely used to dvorak kbd layout...
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