linux-kernel - Re: larger default page sizes...

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Message-ID: <Pine.LNX.4.64.0803261052550.29859@schroedinger.engr.sgi.com>
Date:	Wed, 26 Mar 2008 10:56:17 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Paul Mackerras <paulus@...ba.org>
cc:	Andi Kleen <andi@...stfloor.org>,
	David Miller <davem@...emloft.net>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, linux-ia64@...r.kernel.org,
	torvalds@...ux-foundation.org
Subject: Re: larger default page sizes...

On Wed, 26 Mar 2008, Paul Mackerras wrote:

> So the improvement in the user time is almost all due to the reduced
> TLB misses (as one would expect).  For the system time, using 64k
> pages in the VM reduces it by about 21%, and using 64k hardware pages
> reduces it by another 30%.  So the reduction in kernel overhead is
> significant but not as large as the impact of reducing TLB misses.

One should emphasize that this test was a kernel compile which is not 
a load that gains much from larger pages. 4k pages are mostly okay for 
loads that use large amounts of small files.


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