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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. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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