linux-kernel - Re: [RFC] - Mapping ACPI tables as CACHED

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Message-id: <alpine.LFD.2.00.1007221150360.3164@localhost.localdomain>
Date:	Thu, 22 Jul 2010 11:52:02 -0400 (EDT)
From:	Len Brown <lenb@...nel.org>
To:	Jack Steiner <steiner@....com>
Cc:	mingo@...e.hu, tglx@...utronix.de, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC] - Mapping ACPI tables as CACHED

> The following experimental patch changes the kernel mapping for ACPI tables
> to CACHED. This eliminates the page attibute conflict & allows users to map
> the tables CACHEABLE. This significantly speeds up boot:
> 
> 	38 minutes without the patch
> 	27 minutes with the patch
> 		~30% improvement
> 
> Time to run ACPIDUMP on a large system:
> 	527 seconds without the patch
> 	  8 seconds with the patch

Interesting.

Can you detect a performance differene on a 1-node machine
that doesn't magnify the penalty of the remote uncached access?

thanks,
-Len Brown, Intel Open Source Technology Cetner

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