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From: Vasily Khoruzhick <anarsoul@gmail.com>
To: Stefan Biereigel <security@biereigel-wb.de>
Subject: Re: Interrupt latency on some 945GM platforms
Date: Tue, 28 Sep 2010 00:18:01 +0300
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Cc: linux-kernel@vger.kernel.org, Thomas Gleixner <tglx@linutronix.de>,
        Sitsofe Wheeler <sitsofe@yahoo.com>,
        Venkatesh Pallipadi <venki@google.com>,
        intel-gfx@lists.freedesktop.org, Len Brown <lenb@kernel.org>,
        Jesse Barnes <jbarnes@virtuousgeek.org>
References: <201009132336.17310.anarsoul@gmail.com> <20100924125153.4fdf0c1b@jbarnes-desktop> <4C9F262F.7030709@biereigel-wb.de>
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On 26 of September 2010 13:53:35 Stefan Biereigel wrote:

> Hello Everyone,
> just to add on to reports of this problem, there was a Thread here in
> LKML some months ago targeting the same problem (but not really
> attacking it at the Chipset driver). As I have one of those Laptops with
> a 945GM-Chipset and am stuck with the same Problem (disabled tickless
> now as a workaround and set ticks to 1000) I could maybe do some testing
> of patches.
> So what I can summarize is what the others did before: Disabling CPU1
> helps, adding nohz=off helps, changing the Clocksource afterwards helps,
> binding the Interrupt does NOT help.
> So here's the Link to the old Discussion with follow-ups, maybe you can
> get some furter information from there.
> http://linux.derkeiler.com/Mailing-Lists/Kernel/2010-05/msg03696.html
> We targeted the BIOS itself as everyone in this thread happened to own
> an Phoenix BIOS with some special version string.
> best, Stefan

Yep, my laptop has Phoenix BIOS too. Btw, this BIOS has buggy DSDT (thermal 
and battery don't work reliably without patching DSDT). But I tested with and 
without patched DSDT - so my custom DSDT is not cause of bug in my case.