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    SubjectRe: Poor IDE performance with VIA MVP3
    On Mon, Nov 05, 2001 at 11:42:43AM -0600, Ryan Hayle wrote:
    > On Mon, 05 Nov, 2001 at 04:12:00PM +0000, vda wrote:
    > > Are you saying that hdparm -T -t is yielding wildly varying results?
    > > Looks similar to failing hd symptoms or bug in IDE layer causing retries
    > > after error/timeout. What's in the logs?
    > hdparm -T (buffer-cache reads) gives good numbers, 43v69 M/sec just
    > now. But that's only mesuring reading from the drive's 2M cache (I
    > believe?). It is the hdparm -t test (buffered disk reads) that is the
    > problem. As I said, I don't receive any errors or retries
    > whatsoever. Everything seems to be working perfectly, just very, very
    > slow...
    > > Well, I had problems with drives refusing to do [u]dma.
    > > On my home machine I found out that compiling kernel with support for VIA
    > > chipset allowed udma to work ok (hdparm -T -t = ~20mb/s). Without that
    > > support, my hd was stuck in pio, ~6mb/s.
    > That's the thing--it claims to be in UDMA mode, and again I get no
    > errors. Even when I do 'hdparm -d1 -X66 /dev/hda", everything works fine,
    > without errors, only the speed problems persist. Oh, and I have compiled
    > my kernel with VIA IDE support, it makes no difference in the performance.
    > It's sounding more and more like this isn't a driver/chipset problem, but
    > something wrong with the HD itself. Thanks for your insight.

    This has been a long-standing problem with my system as well. I
    have an MS-5187 VIA MVP4 board and ST320413A UltraATA/100 drive.

    Timing buffer-cache reads: 128 MB in 4.40 seconds = 29.09 MB/sec
    Timing buffered disk reads: 64 MB in 13.06 seconds = 4.90 MB/sec

    Model=ST320413A, FwRev=3.39, SerialNo=7ED05MNS
    Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs RotSpdTol>.5% }
    RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=0
    BuffType=unknown, BuffSize=512kB, MaxMultSect=16, MultSect=off
    CurCHS=16383/16/63, CurSects=-66060037, LBA=yes, LBAsects=39102336
    IORDY=on/off, tPIO={min:240,w/IORDY:120}, tDMA={min:120,rec:120}
    PIO modes: pio0 pio1 pio2 pio3 pio4
    DMA modes: mdma0 mdma1 mdma2 udma0 udma1 udma2 udma3 *udma4 udma5
    Drive Supports : Reserved : ATA-1 ATA-2 ATA-3 ATA-4

    I remember trying out the drive on a Soltek 75KAV and got better
    buffered disk results, ~25.0 MB/sec.

    .--. Michael J. Maravillo office://+63.2.894.3592/
    ( () ) Q Linux Solutions, Inc. mobile://+63.917.897.0919/
    `--\\ A Philippine Open Source Solutions Co.
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