linux-kernel - Re: [regression] openSUSE 12.2 stable kernel 3.7.8-1 big USB 2.0 slowdown

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Date:	Mon, 18 Feb 2013 21:56:51 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Jiri Slaby <jslaby@...e.cz>
cc:	Anja Nützel <Anja@...tzel-hh.de>,
	Jeff Mahoney <jeffm@...e.com>, <mmarek@...e.cz>,
	Dieter Nützel <Dieter@...tzel-hh.de>,
	stable <stable@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [regression] openSUSE 12.2 stable kernel 3.7.8-1 big USB 2.0
 slowdown

On Mon, 18 Feb 2013, Jiri Slaby wrote:

> On 02/18/2013 06:25 AM, Anja Nützel wrote:
> > Maybe it startet with 3.7.7.
> > I could copy several MB onto my USB 2.0 sticks with 3.7.6. (I think).
> > Even with full speed.
> > 
> > With openSUSE 12.2 DVD (kernel 3.4.x) it works OK, too.
> > 
> > Now it degrates to 12 mbits (full-speed USB only).
> 
> This is an upstream 3.7.7 stable regression, I think. Some of these
> patches perhaps:
> d7da098 USB: EHCI: fix for leaking isochronous data
> caa891a USB: storage: optimize to match the Huawei USB storage devices
> and support new switch command
> 08b4bfd USB: storage: Define a new macro for USB storage match rules
> 390077b usb: Using correct way to clear usb3.0 device's remote wakeup
> feature.
> 93dffb7 USB: EHCI: fix bug in scheduling periodic split transfers
> bf79379 USB: EHCI: fix timer bug affecting port resume
> d01875f USB: EHCI: unlink one async QH at a time
> 269ef9f USB: EHCI: remove ASS/PSS polling timeout
> 
> Alan, any ideas?

A lot of people have reported problems caused by the last one 
(269ef9f).  I haven't had time to investigate yet (just got back from 
vacation).

Alan Stern

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