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SubjectRe: dma problems with Serverworks CSB5 chipset
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Just want to report that after changing the disks to two Maxtor 6Y160P0
drives it works fine so the problem must be something in the combination
of CSB5 + WD400BB.

On Sun, 2004-08-08 at 20:09, Torbjörn Olander wrote:
> I'm having the same problems here with linux 2.6.8-rc2 kernel here with
> an Intel SAI2 dual SMP P3 motherboard with Serverworks Serverset III LE
> chipset and CSB5 southbridge.
>
> I run one WDC WD400BB-00DEA0 as master on each channel with SW RAID1 for
> system. To even get DMA working I had to add
> append="ide0=ata66 ide1=ata66"
> in my lilo config. The system works fine with low load on the disks, but
> if I copy greater amounts of data from a local SW RAID5 array I get the
> same DMA timeout error and often it locks up completely.
>
> If i disable DMA with hdparm the system works fine.
>
> /proc/ide/svwks output:
> (DMA disabled with hdparm)
>
> ServerWorks OSB4/CSB5/CSB6
>
> ServerWorks CSB5 Chipset (rev 93)
> ------------------------------- General Status
> ---------------------------------
> --------------- Primary Channel ---------------- Secondary Channel
> -------------
> enabled enabled
> --------------- drive0 --------- drive1 -------- drive0 ----------
> drive1 ------
> DMA enabled: no no no no
> UDMA enabled: yes no yes no
> UDMA enabled: 2 0 2 0
> DMA enabled: 2 2 2 2
> PIO enabled: 4 0 4 0
>
>
>
> On Tue, 2004-08-03 at 19:31, Alan Cox wrote:
> > On Maw, 2004-08-03 at 19:08, Marcelo Tosatti wrote:
> > > ServerWorks OSB4/5 chipsets are known to not work reliably with the Linux
> > > IDE code. AFAIK its a hardware problem which we dont correctly work around.
> > >
> > > Have you tried disabling DMA?
> > >
> > > Bart and Alan are IDE experts, they can probably give you more useful
> > > information.
> >
> > CSB5 is reliable, rock solidly so in my experience. OSB4 was the older
> > interface with problems. Are these systems SMP, what disks are you using
> > and in what IDE mode ?
> >
> > -
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--
Med vänliga hälsningar / Best regards
Torbjörn Olander
tosse@wlug.westbo.se

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