linux-kernel - Re: v2.6.19-rt6, yum/rpm

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Date:	Thu, 7 Dec 2006 22:44:34 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	Fernando Lopez-Lezcano <nando@...ma.Stanford.EDU>,
	linux-kernel@...r.kernel.org, linux-rt-users@...r.kernel.org,
	Mike Galbraith <efault@....de>,
	Clark Williams <williams@...hat.com>,
	Sergei Shtylyov <sshtylyov@...mvista.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Giandomenico De Tullio <ghisha@...il.it>
Subject: Re: v2.6.19-rt6, yum/rpm


* Arjan van de Ven <arjan@...radead.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
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