Messages in this thread | | | Date | Mon, 28 May 2001 15:39:00 -0400 (EDT) | From | Mark Hahn <> | Subject | Re: [patch]: ide dma timeout retry in pio |
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> 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.
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