linux-kernel - Re: Lossy interrupts on x86

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Message-Id: <200709171213.21511.jbarnes@virtuousgeek.org>
Date:	Mon, 17 Sep 2007 12:13:21 -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 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.

So to summarize:

2.6.23-rc5:  works
2.6.23-0.171.rc5.git1.fc8 w/o boot options:  lossy interrupts
2.6.23-0.171.rc5.git1.fc8 nohz=off:  hang when starting 3d apps using
                                     vblank interrupts

Sorry it took so long for me to get back to you, I've been out of range 
for a few days...

Thanks,
Jesse
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