linux-kernel - Re: Problem? intel_iommu=off; perf top shows acpi_os_read

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Message-ID: <20091129124731.7d0c9b45@infradead.org>
Date:	Sun, 29 Nov 2009 12:47:31 -0800
From:	Arjan van de Ven <arjan@...radead.org>
To:	Michael Breuer <mbreuer@...jas.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Thomas Gleixner <tglx@...utronix.de>,
	Len Brown <lenb@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: Re: Problem? intel_iommu=off; perf top shows acpi_os_read_port as
 extremely busy

On Sat, 28 Nov 2009 13:10:21 -0500
Michael Breuer <mbreuer@...jas.com> wrote:

> Ok - my only question then is why things appear so different with 
> intel_iommu enabled.

something else is even more expensive then :0


-- 
Arjan van de Ven 	Intel Open Source Technology Centre
For development, discussion and tips for power savings, 
visit http://www.lesswatts.org
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