On Tue, 21 Mar 2000, Simon Kirby wrote:
> On Tue, Mar 21, 2000 at 12:16:22PM -0800, Andre Hedrick wrote:
>
> > On Tue, 21 Mar 2000, Simon Kirby wrote:
> >
> > > - hdparm -u 1 vs hdparm -u 0 on all drives does not seem to make a
> > > difference.
> > >
> > > - hdparm -d 0 vs hdparm -d 1 on all drives tends to make the problem
> > > happen even more often (guessing 5 times as often). Tested with
> > > both -u 1 and -u 0.
> >
> > What is the rest of the hardware list?
> > You are fingering the difference between DMAING and PIO.
> > If you are trying to DMA with out autodma........you can and usually will
> > be "SHAFTED"!
>
> What do you mean by trying to DMA without autodma?
>
> I'm using an ASUS P2B-DS (PIIX4 tuning and all enabled in kernel config)
> with two Celerons. 128MB ECC SDRAM. Three WD hard drives are attached:
>
> hda: WDC WD273BA, 26105MB w/1961kB Cache, CHS=3328/255/63, UDMA(33)
> hdb: WDC WD273BA, 26105MB w/1961kB Cache, CHS=3328/255/63, UDMA(33)
> hdc: WDC AC28400R, 8063MB w/512kB Cache, CHS=16383/16/63, UDMA(33)
>
> The first two are UDMA/66 drives, but everything is plugged into the
> UDMA/33 on-board controller.
OH MY !!!!............
You know that WDC blows of the UDMA CRC and you are pumping data at
ATA-3/4/5 trasfer rates with ATA-2 correction/dectection, which equals
NONE!!!!!!!!
Please send me a copy of 'lspci -bxxxs 00:07.1 > piix4.pci'
> Not using "hdparm" at all after boot still shows the the same problems.
>
> The case where the problem shows up more with PIO mode looks just like
> the previous problem with the elevator changes -- the timing and/or
> slower I/O made it show up more easily... I don't think it has anything
> to do with incorrect settings (although I may be wrong)...
>
> Simon-
>
> [ Stormix Technologies Inc. ][ NetNation Communcations Inc. ]
> [ sim@stormix.com ][ sim@netnation.com ]
> [ Opinions expressed are not necessarily those of my employers. ]
>
Andre Hedrick
The Linux ATA/IDE guy
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