Re: libata in 2.4.24?

Jeff Garzik
2003-12-02T18:53:13Z

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