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Re: support for SATA port multipliers

On Wed, Feb 01, 2012 at 10:33:13PM -0500, Thor Lancelot Simon wrote:
> On Wed, Feb 01, 2012 at 08:09:18PM -0700, Brook Milligan wrote:
> > It appears that the siisata driver currently does not support
> > attachment to port multiplier boards even though the underlying
> > hardware does in fact support that configuration.
> All SATA hardware should support that configuration, but there is
> no support for it at all in our ATA code.
> Perhaps more urgent, though, if someone wants to hack the SATA
> code out of the sheer goodness of his or her heart, is tagged
> queueing support!

I think both are equally urgent. As most SATA drives comes with a
large write-back cache enabled by default, I'm not sure NCQ will give
a lot of performances improvements in the common case.

Manuel Bouyer <>
     NetBSD: 26 ans d'experience feront toujours la difference

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