From: Jens Axboe <axboe@suse.de>
To: martin@dalecki.de
Cc: Petr Vandrovec <VANDROVE@vc.cvut.cz>, linux-kernel@vger.kernel.org
Subject: Re: IDE from current bk tree, UDMA and two channels...
Date: Thu, 1 Aug 2002 12:05:53 +0200 [thread overview]
Message-ID: <20020801100553.GA13494@suse.de> (raw)
In-Reply-To: <3D4905DB.70305@evision.ag>
On Thu, Aug 01 2002, Marcin Dalecki wrote:
> >hey that sucks :-)
>
> Since IDE 111 not any more...
Yeah I just saw that 110 was the 'broken' solution, 111 made it right.
Good.
> >seriously, the better way to do this would be to change the q->queuedata
> >to be a pointer to drive instead of the channel.
>
> ... becouse this is already *done* there :-).
:-)
> >that would work, but I think it would seriously starve the other device
> >on the same channel.
>
> We starve anyway, becouse the kernel isn't real time and we can't
> guarantee "sleeping" for some maximum time and comming back.
> We don't reschedule the kernel during this kind of "sleeping".
> And we can't know that a command on the "mate" will not take
> extraordinary amounts of time. It's only a problem if mixing travan
> tapes with disks on a channel.
I'm thinking about the alternation of the devices so one device can't
starve the other device off the channel.
--
Jens Axboe
next prev parent reply other threads:[~2002-08-01 10:02 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-07-30 19:26 IDE from current bk tree, UDMA and two channels Petr Vandrovec
2002-07-31 20:01 ` Marcin Dalecki
2002-08-01 9:56 ` Jens Axboe
2002-08-01 9:56 ` Marcin Dalecki
2002-08-01 10:05 ` Jens Axboe [this message]
2002-08-01 10:33 ` Marcin Dalecki
2002-08-01 10:45 ` Jens Axboe
-- strict thread matches above, loose matches on Subject: below --
2002-08-01 23:13 Petr Vandrovec
2002-08-02 13:07 ` Alan Cox
2002-08-01 23:00 Petr Vandrovec
2002-08-01 23:05 ` Alexander Viro
2002-08-01 22:53 Petr Vandrovec
2002-08-01 23:02 ` Alexander Viro
2002-08-01 23:54 ` Linus Torvalds
[not found] <200208012219.g71MJV109133@penguin.transmeta.com>
2002-08-01 22:45 ` Alexander Viro
2002-08-02 9:10 ` Marcin Dalecki
2002-08-01 22:42 Petr Vandrovec
2002-08-01 22:52 ` Alexander Viro
2002-08-02 9:11 ` Marcin Dalecki
2002-08-01 22:34 Petr Vandrovec
2002-08-01 17:07 Petr Vandrovec
2002-08-01 22:00 ` Petr Vandrovec
2002-08-01 22:13 ` Marcin Dalecki
2002-08-01 22:39 ` Alexander Viro
2002-07-30 18:19 Petr Vandrovec
2002-07-31 19:48 ` Marcin Dalecki
2002-07-30 16:15 Petr Vandrovec
2002-07-30 14:03 Petr Vandrovec
2002-07-30 14:25 ` Marcin Dalecki
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