linux-kernel - Re: Lossy interrupts on x86

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

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
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/