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From: Jeff Garzik <jgarzik@pobox.com>
To: Bartlomiej Zolnierkiewicz <B.Zolnierkiewicz@elka.pw.edu.pl>
Cc: Jan-Benedict Glaw <jbglaw@lug-owl.de>,
	axboe@suse.de, linux-kernel@vger.kernel.org
Subject: Re: Testing IDE-TCQ and Taskfile - doesn't work nicely:)
Date: Tue, 24 Jun 2003 10:28:41 -0400	[thread overview]
Message-ID: <3EF86019.3090608@pobox.com> (raw)
In-Reply-To: <Pine.SOL.4.30.0306232315480.8078-200000@mion.elka.pw.edu.pl>

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.

	Jeff




  parent reply	other threads:[~2003-06-24 14:14 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 [this message]
2003-06-24 14:47     ` Jens Axboe
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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