Denys Fedoryshchenko wrote:
quoted text
> Thanks, it works like that.
> 
> Seems in libata there is no fall-back to non-DMA mode, if DMA didn't work.

There is, it's just too conservative about that.  With improvements
pending for 2.6.24, it should be quite snappy at falling back to PIO if
configured transfer mode doesn't seem to work at all (consecutive IO
command failures after transfer mode configuration change).

-- 
tejun
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