From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from d01relay04.pok.ibm.com (d01relay04.pok.ibm.com [9.56.227.236]) by e4.ny.us.ibm.com (8.13.8/8.13.8) with ESMTP id m2PIRi0n015715 for ; Tue, 25 Mar 2008 14:27:44 -0400 Received: from d01av02.pok.ibm.com (d01av02.pok.ibm.com [9.56.224.216]) by d01relay04.pok.ibm.com (8.13.8/8.13.8/NCO v8.7) with ESMTP id m2PIRiG6241980 for ; Tue, 25 Mar 2008 14:27:44 -0400 Received: from d01av02.pok.ibm.com (loopback [127.0.0.1]) by d01av02.pok.ibm.com (8.12.11.20060308/8.13.3) with ESMTP id m2PIRig7030595 for ; Tue, 25 Mar 2008 14:27:44 -0400 Subject: Re: larger default page sizes... From: Dave Hansen In-Reply-To: <18408.29107.709577.374424@cargo.ozlabs.ibm.com> References: <20080321.145712.198736315.davem@davemloft.net> <20080324.133722.38645342.davem@davemloft.net> <18408.29107.709577.374424@cargo.ozlabs.ibm.com> Content-Type: text/plain Date: Tue, 25 Mar 2008 11:27:45 -0700 Message-Id: <1206469665.27393.19.camel@nimitz.home.sr71.net> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit 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: On Tue, 2008-03-25 at 14:29 +1100, Paul Mackerras wrote: > 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. Can you do the same thing with the 4k MMU pages and 64k PAGE_SIZE? Wouldn't that easily break out whether the advantage is from the TLB or from less kernel overhead? -- Dave -- 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