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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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