On 07/02/2006, at 2:22 AM, Alan Cox wrote:
On Tue, Feb 07, 2006 at 01:57:53AM +1100, Steven Haigh wrote:
What I have noticed however, is that when the drive is reattached/
redetected, DMA mode is disabled. If cannot be re-enabled by using
'hdparm -d1 /dev/hdc' - so the drive only runs in PIO mode. This
means performance really sucks.
Does anyone know enough about why this happens to try to hack a
workaround for this? It would be awesome to get DMA running again
after a hot-swap-in.
After testing this, I've lodged it as BZ #180161.
Not supported. And the framework needed to support it is no longer
present either. The libata layer is getting the needed code developed
for hot plug so should hopefully acquire support over time
Ahhh ok - this seems to make a lot of sense. My main wonder was if
the kernel could detect if DMA was available and use it upon re-
enabling the IDE controller (ie in the same code that re-enables the
controller) - but it looks like you've answered that. I guess I'll
see what the future of libata brings ;)
--
Steven Haigh
Email: netwiz@xxxxxxxxx
Web: http://www.crc.id.au
Phone: (03) 9017 0597 - 0412 935 897
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