linux-kernel - Re: Lossy interrupts on x86

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Message-Id: <200709201222.55278.jbarnes@virtuousgeek.org>
Date:	Thu, 20 Sep 2007 12:22:55 -0700
From:	Jesse Barnes <jbarnes@...tuousgeek.org>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Randy Dunlap <randy.dunlap@...cle.com>,
	linux-kernel@...r.kernel.org
Subject: Re: Lossy interrupts on x86_64

On Monday, September 17, 2007, Thomas Gleixner wrote:
> On Mon, 2007-09-17 at 12:13 -0700, Jesse Barnes wrote:
> > On Wednesday, September 12, 2007, Thomas Gleixner wrote:
> > > does it make any difference when you boot the box with:
> > >
> > > nohz=off
> > >
> > > on the kernel command line ?
> >
> > Yeah, that makes a difference:  the box hangs when I start
> > receiving vblank interrupts instead.  However it's not a hard hang,
> > I think X just becomes unresponsive.  I can still hit the power
> > button on the laptop and the machine shuts down gracefully, but
> > ctl-alt-delete and ctl-alt-backspace don't work.  So X is probably
> > still up and in charge of input but may not be getting any more
> > timeslices or something.
>
> Eeek, that sounds scary. Can you add "highres=off" as well ?

FWIW I just tried your linux-2.6-hires tree with the attached config and 
still see the problem.  It doesn't look like NO_HZ is even an option in 
that tree...

Jesse

View attachment ".config" of type "text/plain" (69483 bytes)