Alan Cox wrote:
>
> > Used for a while, copied about 7gigs onto it. Then got lots of BadCRC
> > errors when reading from disk (from dma_intr). Decided to disable DMA
> > as a result of this...
>
> Cable errors. Disabling DMA also disabled error checking and correction
Jeez. Crappity, crappity, crap. Embarrassing mistake of the year.
I managed to convince myself that the cable couldn't possibly be
responsible, because we got corruption even when using UDMA-33 (which
protects from cable faults). Somewhere in my logic I obviously lost the
plot, and forgot that I switched DMA off *before* seeing corruption.
Sigh. Ah, I think I see a nice brown bag, in a nice deep hole.
Thank you for gently pointing out the error of my ways ;-)
Neil
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
This archive was generated by hypermail 2b29 : Thu Jun 07 2001 - 21:00:30 EST