Re: [patch]: ide dma timeout retry in pio

From: Alan Cox (alan@lxorguk.ukuu.org.uk)
Date: Mon May 28 2001 - 16:12:31 EST


> really? do we know the nature of the DMA engine problem well enough?

I can categorise some of them:

1. Hardware that just doesnt support it.
2. Timeouts that are false positives caused by disks having problems
        and being very slow to recover
3. Bad cabling
4. Stalls caused by heavy PCI traffic

> is there a reason to believe that it'll work better "later"?

#1 will go fail, fail, fail -> PIO now (or should do Im about to try it)
#2 and #4 will be transient
#3 could go either way
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This archive was generated by hypermail 2b29 : Thu May 31 2001 - 21:00:37 EST