Alan Cox wrote:
On Fri, 22 Jun 2007 11:01:09 -0400
Mark Lord <liml@xxxxxx> wrote:
Alan Cox wrote:
Allow
libata.pata_dma=0
to disable DMA (default is 1)
SATA is unaffected as disabling DMA for SATA makes no sense at all.
Signed-off-by: Alan Cox <alan@xxxxxxxxxx>
Alan,
Should we really be piling up like this on global boot/module options
rather than run-time flags on individual channels/devices ?
I can imagine systems with internal notebook drives that want dma=1,
plus Cardbus CF devices that require dma=0.
With a single global flag, how does one do that?
We need proper tuning as well but there is huge value (with distro hat
on especially) in a single "try this to get it installed and then we can
debug it" button. Same with the old IDE. Trying to guide users through
selecting specific channels/devices is going to be painful. I want
something that I can tell people to get them 'off the ground' and work
with them to sort the rest.
Oh for sure. I'm just thinking that some form of on-the-fly tunable
would be of even greater value here, in addition to the boot/load default flag.
I think a /sys/ "dma" attribute (pick a name) might be most appropriate,
or we just just implement HDIO_[GS]ET_DMA as a simpler/lazier mechanism.
Cheers
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