> request, when we hit a dma timout. In this case, what we really want to
> do is retry the request in pio mode and revert to normal dma operations
> later again.
really? do we know the nature of the DMA engine problem well enough?
is there a reason to believe that it'll work better "later"?
I guess I was surprised at resorting to PIO - couldn't we just
break the request up into smaller chunks, still using DMA?
I seem to recall Andre saying that the problem arises when the
ide DMA engine looses PCI arbitration during a burst. shorter
bursts would seem like the best workaround if this is the problem...
resorting to PIO would be such a shame, not only because it eats
CPU so badly, but also because it has no checksum like UDMA...
thanks, mark hahn.
-
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 May 31 2001 - 21:00:37 EST