linux-kernel - Re: Forcing modes in libata (was: SATA buffered read VERY slow)

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Date:	Sun, 6 Jan 2008 08:03:31 +0300
From:	Al Boldi <a1426z@...ab.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Forcing modes in libata (was: SATA buffered read VERY slow)

Alan Cox wrote:
> Al Boldi <a1426z@...ab.com> wrote:
> > What's hindering the ability to force a mode in libata, as is possible
> > with the normal ide-driver?
>
> We want it to be correct and race free. That means we have to synchronize
> all the devices on the controller, quiesce them and recompute the speeds
> for each device then turn them all back on and resume command processing.
>
> It is quite hairy although Tejun's EH work has provided the framework for
> all of this.
>
> For now you can boot with libata.dma=1 to select DMA on disks but not CD

Great, but why isn't this in the documentation?


Thanks!

--
Al

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