From: Rene Herman <rene.herman@keyaccess.nl>
To: David Brownell <david-b@pacbell.net>
Cc: linux-kernel@vger.kernel.org
Subject: Re: External USB2 HDD affects speed hda
Date: Sat, 17 Sep 2005 16:45:05 +0200 [thread overview]
Message-ID: <432C2BF1.1040100@keyaccess.nl> (raw)
In-Reply-To: <20050917023639.B49481FF9E@adsl-69-107-32-110.dsl.pltn13.pacbell.net>
David Brownell wrote:
>>Hi David. Has there been any progress on this issue?
>>
>>(thread at http://marc.theaimsgroup.com/?t=111749614000002&r=1&w=2)
>
>
> Taking a look at that, I found one case that _might_ explain it. That
> scenario could crop more (or less) based on loads and timings, and I've
> suspected that the VIA chips have significantly different timings for
> certain things. This patch handles that case differently, just expecting
> the unlink completion code (later) to restart the schedule.
>
> I sanity tested this, but that's all.
[ snip ]
> - if (!head->qh_next.qh) {
> + if (!head->qh_next.qh && !ehci->reclaim) {
Thanks, but unfortunately no change. That is, still have that "Async"
status flag toggling on and off in /sys/class/usb_host/usb?/registers
(and the ~ 8MB/s drop in IDE throughput).
Rene.
next prev parent reply other threads:[~2005-09-17 14:46 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-05-30 23:21 External USB2 HDD affects speed hda 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
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 [this message]
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
-- strict thread matches above, loose matches on Subject: below --
2005-12-21 7:08 Helmut Toplitzer
2005-12-21 8:10 ` Rene Herman
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