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

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Date:	Sat, 5 Jan 2008 16:41:03 +0300
From:	Al Boldi <a1426z@...ab.com>
To:	linux-kernel@...r.kernel.org
Subject: Forcing modes in libata (was: SATA buffered read VERY slow)

Alan Cox wrote:
> hdparm supports identify to read modes on drives with libata. The one
> thing you cannot do is force modes right now.

I have some AOpen 52x/32x CD-RWriter, that advertises itself as DMA capable, 
but has a hard time sustaining such access.  The only way to make access to 
this drive safe is by reducing it to PIO-3 even on XP,  which makes libata 
somewhat unusable on this drive, especially for writing.

What's hindering the ability to force a mode in libata, as is possible with 
the normal ide-driver?

Thanks!

--
Al

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