Re: 2.9test9-mm1 and DAO ATAPI cd-burning corrupt

Jens Axboe
2003-11-06T14:02:59Z

On Fri, Nov 07 2003, Nick Piggin wrote:
>
>
> Jens Axboe wrote:
>
> >On Thu, Nov 06 2003, Prakash K. Cheemplavam wrote:
> >
> >>>>>Heh indeed, maybe because the archs I use are still at 100. Looks
> >>>>>suspiciously like it's loosing timer interrupts, which would indeed
> >>>>>point to PIO.
> >>>>>
> >>>>>
> >>>>bash-2.05b# hdparm -I /dev/hdc
> >>>>
> >>>
> >>>-i please
> >>>
> >>bash-2.05b# hdparm -i /dev/hdc
> >>
> >>/dev/hdc:
> >>
> >>Model=LITE-ON LTR-16102B, FwRev=OS0K, SerialNo=
> >>Config={ Fixed Removeable DTR<=5Mbs DTR>10Mbs nonMagnetic }
> >>RawCHS=0/0/0, TrkSize=0, SectSize=0, ECCbytes=0
> >>BuffType=unknown, BuffSize=0kB, MaxMultSect=0
> >>(maybe): CurCHS=0/0/0, CurSects=0, LBA=yes, LBAsects=0
> >>IORDY=yes, tPIO={min:227,w/IORDY:120}, tDMA={min:120,rec:120}
> >>PIO modes: pio0 pio1 pio2 pio3 pio4
> >>DMA modes: mdma0 mdma1 *mdma2
> >>AdvancedPM=no
> >>
> >>* signifies the current active mode
> >>
> >>The same: dma is active.
> >>
> >
> >Indeed, so you are ysing multiword mode 2. Can you try and do a dd from
> >the drive, while doing a vmstat 1? Also, does that show the jerky
> >behaviour?
> >
>
> AFAIK, Prakash cannot reproduce this bad behaviour with mm1, only mm2 (is
> this right, Prakash?). So its something there (don't forget Andrew merges
> the latest bk with his releases too).

I'm not aware of anything in that area that could explain the change.

--
Jens Axboe