From: Jens Axboe <axboe@suse.de>
To: Jeff Garzik <jgarzik@pobox.com>
Cc: Bartlomiej Zolnierkiewicz <B.Zolnierkiewicz@elka.pw.edu.pl>,
Jan-Benedict Glaw <jbglaw@lug-owl.de>,
linux-kernel@vger.kernel.org
Subject: Re: Testing IDE-TCQ and Taskfile - doesn't work nicely:)
Date: Tue, 24 Jun 2003 16:47:30 +0200 [thread overview]
Message-ID: <20030624144730.GW7383@suse.de> (raw)
In-Reply-To: <3EF86019.3090608@pobox.com>
On Tue, Jun 24 2003, Jeff Garzik wrote:
> Bartlomiej Zolnierkiewicz wrote:
> >TCQ shouldn't be enabled on hdc, you have two drives on second ide
> >channel and current TCQ driver design allows only one drive per channel,
> >so proper fix is to not enable TCQ :-).
>
>
> IMO the best rule is "enable TCQ if and only if 100% of the channel
> supports TCQ".
>
> So, two drives on the same channel can do TCQ, if and only if they both
> support TCQ. That's a big benefit of bus release, after all,
> simultaneously servicing multiple drives. The device-select and service
> interrupt semantics are annoying but doable.
ide-tcq is even more restrictive now, it only enables TCQ if the drive
is alone on the channel. Feel free to write the device select code if
you want, I'm not mucking more with the bastard that is ide tcq.
--
Jens Axboe
next prev parent reply other threads:[~2003-06-24 14:33 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-06-23 19:45 Testing IDE-TCQ and Taskfile - doesn't work nicely:) Jan-Benedict Glaw
2003-06-23 21:18 ` Bartlomiej Zolnierkiewicz
2003-06-23 22:19 ` Jan-Benedict Glaw
2003-06-23 23:50 ` Jan-Benedict Glaw
2003-06-24 0:53 ` Bartlomiej Zolnierkiewicz
2003-06-24 6:31 ` Jan-Benedict Glaw
2003-06-24 13:44 ` Bartlomiej Zolnierkiewicz
2003-06-24 22:40 ` Jan-Benedict Glaw
2003-06-24 23:08 ` Bartlomiej Zolnierkiewicz
2003-06-25 18:22 ` SOLVED - " Jan-Benedict Glaw
2003-06-25 18:44 ` Bartlomiej Zolnierkiewicz
2003-06-25 19:05 ` Jan-Benedict Glaw
2003-06-25 19:30 ` Bartlomiej Zolnierkiewicz
2003-06-26 3:21 ` Zwane Mwaikambo
2003-06-26 5:58 ` Jan-Benedict Glaw
2003-06-24 8:06 ` Jens Axboe
2003-06-24 14:28 ` Jeff Garzik
2003-06-24 14:47 ` Jens Axboe [this message]
2003-06-24 15:39 ` Jeff Garzik
2003-06-29 2:17 ` Andre Hedrick
2003-06-29 8:14 ` Jan-Benedict Glaw
2003-06-29 9:30 ` Andre Hedrick
2003-06-29 10:45 ` Jan-Benedict Glaw
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