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    SubjectRe: UDMA Support for ALI1543?
    On Wed, 24 Feb 1999, Andrzej Krzysztofowicz wrote:

    > > > Look at Andre's homepage:
    > > >
    > > > http://www.dyer.vanderbilt.edu/server/udma/
    > >
    > > I took a look at it and grabbed the patch, but I didn't see any reference
    > > to the ALI 15xx series chips. The patch only appears to address ALI 14xx
    > > series chips.
    >
    > The patch does nothing with ALI 14xx. It supports ALI 15xx called Aladdin.
    > ALI 14xx is old and even does not support UDMA
    > However the patch does almost nothing for you if your BIOS does set your
    > chipset properly basing on CMOS settings...

    I patched w/ 2.2.2-ac1 and your 2.2.2-uniorm ide patch and rebuilt the
    kernel. When I boot, I get the following in dmesg;

    ALI15X3: IDE controller on PCI bus 00 dev 78
    ALI15X3: not 100% native mode: will probe irqs later
    ALI15X3: enabled read of IDE channels state (en/dis-abled) Succeeded.
    ide0: BM-DMA at 0xf000-0xf007, BIOS settings: hda:DMA, hdb:pio
    ide1: BM-DMA at 0xf008-0xf00f, BIOS settings: hdc:pio, hdd:pio
    hda: Maxtor 90576D4, ATA DISK drive
    hdb: TOSHIBA CD-ROM XM-6402B, ATAPI CDROM drive
    hdc: WDC AC21600H, ATA DISK drive
    ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
    ide1 at 0x170-0x177,0x376 on irq 15
    hda: Maxtor 90576D4, 5495MB w/256kB Cache, CHS=700/255/63, (U)DMA
    hdc: WDC AC21600H, 1549MB w/128kB Cache, CHS=3148/16/63, DMA
    hdb: ATAPI 32X CD-ROM drive, 256kB Cache
    Uniform CDROM driver Revision: 2.52

    Here's my results using hdparm.

    2.2.1-ac6 (Standard IDE Driver)

    Timing buffered disk reads: 64 MB in 9.44 seconds = 6.78 MB/sec
    Timing buffered disk reads: 64 MB in 9.43 seconds = 6.79 MB/sec
    Timing buffered disk reads: 64 MB in 9.44 seconds = 6.78 MB/sec
    Timing buffered disk reads: 64 MB in 9.51 seconds = 6.73 MB/sec
    Timing buffered disk reads: 64 MB in 9.39 seconds = 6.82 MB/sec

    2.2.2-ac1-uniform-ide

    Timing buffered disk reads: 64 MB in 8.09 seconds = 7.91 MB/sec
    Timing buffered disk reads: 64 MB in 8.13 seconds = 7.87 MB/sec
    Timing buffered disk reads: 64 MB in 8.12 seconds = 7.88 MB/sec
    Timing buffered disk reads: 64 MB in 8.33 seconds = 7.68 MB/sec
    Timing buffered disk reads: 64 MB in 10.19 seconds = 6.28 MB/sec

    So.. there is most definitly an improvement. Got any suggestions for a
    better disk speed suite than "hdparm"?


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