From mboxrd@z Thu Jan 1 00:00:00 1970 Subject: Re: larger default page sizes... References: <20080321.145712.198736315.davem@davemloft.net> <20080324.133722.38645342.davem@davemloft.net> <18408.29107.709577.374424@cargo.ozlabs.ibm.com> From: Andi Kleen Date: 25 Mar 2008 13:05:53 +0100 In-Reply-To: <18408.29107.709577.374424@cargo.ozlabs.ibm.com> Message-ID: <87wsnrgg9q.fsf@basil.nowhere.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: owner-linux-mm@kvack.org Return-Path: To: Paul Mackerras Cc: David Miller , clameter@sgi.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-ia64@vger.kernel.org, torvalds@linux-foundation.org List-ID: Paul Mackerras writes: > > 4kB pages: 444.051s user + 34.406s system time > 64kB pages: 419.963s user + 16.869s system time > > That's nearly 10% faster with 64kB pages -- on a kernel compile. Do you have some idea where the improvement mainly comes from? Is it TLB misses or reduced in kernel overhead? Ok I assume both play together but which part of the equation is more important? -Andi -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org