From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ingo Molnar <mingo@elte.hu>
Subject: Re: v2.6.19-rt6, yum/rpm
Date: Thu, 7 Dec 2006 22:44:34 +0100
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References: <20061205171114.GA25926@elte.hu> <1165524358.9244.33.camel@cmn3.stanford.edu> <20061207205819.GA21953@elte.hu> <1165526445.27217.59.camel@laptopd505.fenrus.org>
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Cc: Fernando Lopez-Lezcano <nando@ccrma.Stanford.EDU>,
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	Mike Galbraith <efault@gmx.de>,
	Clark Williams <williams@redhat.com>,
	Sergei Shtylyov <sshtylyov@ru.mvista.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Giandomenico De Tullio <ghisha@email.it>
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To: Arjan van de Ven <arjan@infradead.org>
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* Arjan van de Ven <arjan@infradead.org> wrote:

> > i think it's the UP vs. SMP difference. We are chasing some SMP 
> > latencies right now that trigger on boxes that have deeper C sleep 
> > states. idle=poll seems to work around those problems.
> 
> well C-states do cause latencies... as advertized in the 
> /proc/acpi/processor/CPU0/power file.

no, this is a plain logic bug somewhere, not a hardware latency. 
Sometimes the latency is in the seconds range, etc.

	Ingo