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From: Len Brown <lenb@kernel.org>
To: Jack Steiner <steiner@sgi.com>
Cc: mingo@elte.hu, tglx@linutronix.de, linux-acpi@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: Re: [RFC] - Mapping ACPI tables as CACHED
Date: Thu, 22 Jul 2010 11:52:02 -0400 (EDT)	[thread overview]
Message-ID: <alpine.LFD.2.00.1007221150360.3164@localhost.localdomain> (raw)
In-Reply-To: <20100722152220.GA18290@sgi.com>

> 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


  reply	other threads:[~2010-07-22 15:52 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-07-22 15:22 [RFC] - Mapping ACPI tables as CACHED Jack Steiner
2010-07-22 15:52 ` Len Brown [this message]
2010-07-23 16:38   ` Jack Steiner
2010-07-23  1:46 ` ykzhao
2010-07-23  7:23   ` Ingo Molnar
2010-07-23 14:26     ` ykzhao
2010-08-17 14:45       ` Jack Steiner
2010-08-17 15:51       ` H. Peter Anvin
2010-08-17 14:42     ` Jack Steiner
2010-08-17 14:39   ` Jack Steiner
2010-07-24  0:14 ` Henrique de Moraes Holschuh
2010-07-24  0:45   ` Matthew Garrett
2010-07-24 12:26     ` Henrique de Moraes Holschuh
2010-08-17 14:49   ` Jack Steiner
2010-08-17 16:02     ` Linus Torvalds
2010-08-17 16:02       ` Linus Torvalds
2010-08-24 21:39   ` H. Peter Anvin
2010-08-26 17:17     ` [RFC - V2] " Jack Steiner
2010-08-26 18:08       ` H. Peter Anvin
2010-12-08 21:22         ` Jack Steiner
2010-12-09  1:27           ` H. Peter Anvin
2010-12-09  3:50             ` Jack Steiner
2010-12-09  6:12               ` Len Brown
2010-08-17 15:59 ` [RFC] " Jack Steiner
2010-08-26 17:47   ` Len Brown

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