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SubjectRe: Poor IDE performance with VIA MVP3
On Monday 05 November 2001 19:54, Mike Maravillo wrote:

> > 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
> AdvancedPM=no
> 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.

In my experience, if kernel has no support for your particular IDE
chip compiled in, you will likely be unable to get [u]dma working.

However, I have one hd which refuses to do dma even with proper support
compiled in (I have PIIX IDE). All I can do is
# hdparm -c1 -A1 -W1 /dev/hda
and get 8mb/s in
# hdparm -T -t /dev/hda
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