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Message-ID: <4CA02F96.2000508@biereigel-wb.de>
Date: Mon, 27 Sep 2010 07:45:58 +0200
From: Stefan Biereigel <security@biereigel-wb.de>
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To: Shaohua Li <shaohua.li@intel.com>
CC: linux-kernel@vger.kernel.org, Vasily Khoruzhick <anarsoul@gmail.com>,
        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>
Subject: Re: Interrupt latency on some 945GM platforms
References: <201009132336.17310.anarsoul@gmail.com>	<201009162306.59508.anarsoul@gmail.com>	<20100924123901.243c85e1@jbarnes-desktop>	<201009242248.36554.anarsoul@gmail.com>	<20100924125153.4fdf0c1b@jbarnes-desktop>	<4C9F262F.7030709@biereigel-wb.de> <AANLkTinZ-A-D=yEsN00dGB=fpTgV72BgrEra9UpkmVHX@mail.gmail.com>
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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
>>     
> does disable msi help with 'pci=nomsi'?
>   
No, here it doesn't.