From: David Brownell <david-b@pacbell.net>
To: Mikulas Patocka <mikulas@artax.karlin.mff.cuni.cz>
Cc: Rene Herman <rene.herman@keyaccess.nl>,
Pavel Machek <pavel@ucw.cz>,
Bartlomiej Zolnierkiewicz <B.Zolnierkiewicz@elka.pw.edu.pl>,
Linux Kernel <linux-kernel@vger.kernel.org>,
Mark Lord <lkml@rtr.ca>,
David Brownell <dbrownell@users.sourceforge.net>
Subject: Re: External USB2 HDD affects speed hda
Date: Wed, 1 Jun 2005 19:17:14 -0700 [thread overview]
Message-ID: <200506011917.14678.david-b@pacbell.net> (raw)
In-Reply-To: <Pine.LNX.4.58.0506020316240.28167@artax.karlin.mff.cuni.cz>
On Wednesday 01 June 2005 6:23 pm, Mikulas Patocka wrote:
>
> Didn't you just forget to set H-bit in exactly one queue head? If there's
> no entry with H-bit set, controller will loop over list of empty heads
> again and again.
Two things:
- Why do you ask that? There's only one QH that _ever_ has that bit set.
And it's never removed from the async ring.
- The question should be why the schedule is getting turned on in the
first place, given there's no work for it to do.
Until I have some time available to actually look at this, all I can do
is answer questions and say "hmm, that's strange" given wierd facts. The
wierdness here is why that "Async" status bit is ever getting set when
there's no work for it to do.
- Dave
next prev parent reply other threads:[~2005-06-02 2:17 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-05-30 23:21 Rene Herman
2005-06-01 8:18 ` Pavel Machek
2005-06-01 18:25 ` Rene Herman
2005-06-01 19:40 ` David Brownell
2005-06-01 22:14 ` Rene Herman
2005-06-01 22:33 ` Rene Herman
2005-06-01 23:43 ` David Brownell
2005-06-02 1:23 ` Mikulas Patocka
2005-06-02 2:17 ` David Brownell [this message]
2005-06-02 13:19 ` Rene Herman
2005-08-05 22:34 ` Rene Herman
2005-09-17 2:36 ` David Brownell
2005-09-17 14:45 ` Rene Herman
2005-12-12 23:24 ` Rene Herman
2005-06-02 13:57 ` Lennart Sorensen
2005-06-02 13:11 ` Rene Herman
2005-06-02 20:37 ` Lennart Sorensen
2005-06-02 22:49 ` Grant Coady
2005-06-02 23:56 ` Rene Herman
2005-06-03 0:54 ` David Brownell
2005-06-01 11:48 ` Mark Lord
2005-06-01 18:30 ` Rene Herman
2005-06-01 19:15 ` Petr Vandrovec
2005-06-01 19:45 ` Rene Herman
2005-06-01 20:37 ` David Brownell
2005-06-01 22:24 ` Rene Herman
2005-06-01 23:40 ` David Brownell
2005-12-21 7:08 Helmut Toplitzer
2005-12-21 8:10 ` Rene Herman
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=200506011917.14678.david-b@pacbell.net \
--to=david-b@pacbell.net \
--cc=B.Zolnierkiewicz@elka.pw.edu.pl \
--cc=dbrownell@users.sourceforge.net \
--cc=linux-kernel@vger.kernel.org \
--cc=lkml@rtr.ca \
--cc=mikulas@artax.karlin.mff.cuni.cz \
--cc=pavel@ucw.cz \
--cc=rene.herman@keyaccess.nl \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
Powered by JetHome