linux-kernel - Re: Interrupt latency on some 945GM platforms

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Message-ID: <4CA02F96.2000508@biereigel-wb.de>
Date:	Mon, 27 Sep 2010 07:45:58 +0200
From:	Stefan Biereigel <security@...reigel-wb.de>
To:	Shaohua Li <shaohua.li@...el.com>
CC:	linux-kernel@...r.kernel.org,
	Vasily Khoruzhick <anarsoul@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Sitsofe Wheeler <sitsofe@...oo.com>,
	Venkatesh Pallipadi <venki@...gle.com>,
	intel-gfx@...ts.freedesktop.org, Len Brown <lenb@...nel.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>
Subject: Re: Interrupt latency on some 945GM platforms

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.
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