linux-kernel - Re: [3.9-rc1] irq 16: nobody cared (was [3.9-rc1] very poor interrupt responses)

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Date:	Fri, 8 Mar 2013 21:19:44 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Peter Hurley <peter@...leysoftware.com>
cc:	Shawn Starr <shawn.starr@...ers.com>,
	Thomas Meyer <thomas@...3r.de>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	USB list <linux-usb@...r.kernel.org>
Subject: Re: [3.9-rc1] irq 16: nobody cared  (was [3.9-rc1] very poor interrupt
 responses)

On Fri, 8 Mar 2013, Peter Hurley wrote:

> [ +linux-usb ]
> 
> On Fri, 2013-03-08 at 14:12 -0500, Shawn Starr wrote:
> > Hello folks,
> > 
> > I am noticing since rc0 and now rc1, very poor interrupt handling. Keyboard response, mouse movements, display refreshing etc. General input/display sluggishness. Did something break IRQ handling somewhere? I need to validate if this happens with X not running also if it is i915 related somehow. The behavor is noticed in a console login however.
> > 
> > Device: Lenovo W500 laptop
> 
> Hi Shawn,
> 
> Unhandled interrupts is the problem.
> 
> Is the device below being id'd properly?
> If you remove this device, does the problem go away?

Does either of the kernels in question have commit 0f815a0a700b (USB:
UHCI: fix IRQ race during initialization)?  That commit was added to
fix precisely this sort of thing.

Alan Stern

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