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

[Nick Piggin <piggin@cyberone.com.au>]

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).