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Date: Tue, 2 Dec 2003 13:49:14 -0500
From: Jeff Garzik <jgarzik@pobox.com>
To: Greg Stark <gsstark@mit.edu>, Erik Steffl <steffl@bigfoot.com>,
       linux-kernel@vger.kernel.org
Subject: Re: libata in 2.4.24?
Message-ID: <20031202184914.GA7839@gtf.org>
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On Tue, Dec 02, 2003 at 10:46:48AM -0800, Mike Fedyk wrote:
> On Tue, Dec 02, 2003 at 01:04:58PM -0500, Jeff Garzik wrote:
> > On Tue, Dec 02, 2003 at 09:40:48AM -0800, Mike Fedyk wrote:
> > > There are PATA drives that do TCQ too, but you have to look for that feature
> > > specifically.  IDE TCQ is in 2.6, but is still experemental.  I think Jens
> > > Axboe was the one working on it IIRC.  He would have more details.
> > 
> > Let us distinguish three types of TCQ:
> > 1) PATA drive-side TCQ (now called "legacy TCQ")
> > 2) Controller-side TCQ
> > 3) SATA drive/controller-side TCQ ("first party DMA")
> > 
> > libata will never support #1, which is what 2.6 supports in experimental
> > option.
> 
> An experemental option with the ide layer, not libata, right?

Correct.


> > libata will support #2 very soon, and will support #3 when hardware is
> > available.
> > 
> 
> If you have Controller-side TCQ, then will it work with any IDE PATA/SATA
> drive?

Yes.

	Jeff