Alan Cox wrote:
>
> > Does that make DMA bad for disk IOs ? ;)
>
> No. You misunderstand my interest. Im not interested in whether DMA, polled
> I/O, or FIQ is the right way to do disk I/O. Im trying to find a pattern
> to the reports of people who get disk corruption in 2.1.10x and dont in
> 2.0.x (I've eliminated several reports that also had 2.0.x problems already
> and one person found the DMA problem was a CPU fan ;))
>
> Im entirely interested in the following if people would like to mail me
> reports (off list and I'll summarise)
>
> Mail me only if they see disk corruption problems. The same procedure under
> 2.0.x doesnt cause problems (btw please for IDE test 2.0.34/35 with UDMA
> support too).
>
> o Disk controller type (IDE/SCSI) :
> o Disk Hardware :
> o Other devices on cable/chain :
> o Does 2.0.33 also corrupt :
> o Does 2.0.34/35 corrupt :
> o Are you using RAID (md driver software) :
> o What processor :
> o What chipset :
>
> > We must be aware that buses that donnot implement either parity or
> > CRC may lead to _silent_ data corruption.
>
> SCSI has parity and IDE has CRC. The IDE CRC was even done right - to a non
> aware host the IDE CRC error appears to be a soft drive error. Only a UDMA
> host realises its actually a cable CRC - so it fails safe
>
> Alan
>
> -
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.rutgers.edu
> Please read the FAQ at http://www.altern.org/andrebalsa/doc/lkml-faq.html
--
--- Windows 98 supports real multitasking - it can boot and crash simultaneously. *** ************************************* * Joseph Anthony * * jga@cowboy.net * * * * Http://www.cowboy.net/~jga * * ------------------------------- * * * * System Administrator Cowboy.net * * www.cowboy.net * *************************************- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.rutgers.edu Please read the FAQ at http://www.altern.org/andrebalsa/doc/lkml-faq.html