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    SubjectRe: [patch 2.6.22-rc6] ATA: add a PCI ID for Intel Santa Rosa PATA controller
    Date
    On Friday, 6. July 2007, Gaston, Jason D wrote:
    > >> > On the other hand, we can leave it, because of a
    > >"off-by-one error" in ata_piix.c,
    > >> > do_pata_set_dmamode, line ~770:
    > >> > [...]
    > >>
    > >
    > >Thanks,
    > > Chr.
    > >
    > >
    >
    > I quickly tried this patch on an ICH7-R system with an ATA133 Maxtor HD
    > and it did not seem to do anything bad. I see no difference in function
    > or performance with the patch.
    >
    > Jason
    >

    Thanks for testing, but you forgot some numbers. ;)
    (bonnie++? hdparm -i && hdparm -t...)

    Because, I don't think that Maxtor HD's mechanics is faster than 100MB/s..
    The only thing that can keep up with > 100MB/s are the few MB of Cache on every HDD...
    (so, does anyone have a good idea to check the HDD's cache performance?
    hdparm -t reads too much data)

    I came up with something like:
    "dd if=/dev/sdX of=/dev/null bs=4M count=1 iflag=direct"

    and run it 10 times in a row.

    here's a test run with a SATA I WD2500YD-01N ( hdparm -t performance: ~57MB/s)
    4194304 bytes (4.2 MB) copied, 0.0897687 seconds, 46.7 MB/s
    4194304 bytes (4.2 MB) copied, 0.0776731 seconds, 54.0 MB/s
    4194304 bytes (4.2 MB) copied, 0.0711224 seconds, 59.0 MB/s
    4194304 bytes (4.2 MB) copied, 0.0679675 seconds, 61.7 MB/s
    4194304 bytes (4.2 MB) copied, 0.0603272 seconds, 69.5 MB/s
    4194304 bytes (4.2 MB) copied, 0.0543068 seconds, 77.2 MB/s
    4194304 bytes (4.2 MB) copied, 0.0522881 seconds, 80.2 MB/s
    4194304 bytes (4.2 MB) copied, 0.0520612 seconds, 80.6 MB/s
    4194304 bytes (4.2 MB) copied, 0.0444805 seconds, 94.3 MB/s
    4194304 bytes (4.2 MB) copied, 0.0338407 seconds, 124 MB/s
    4194304 bytes (4.2 MB) copied, 0.0333174 seconds, 126 MB/s

    Thanks,
    Chr
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