Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751640AbWBWTdE (ORCPT ); Thu, 23 Feb 2006 14:33:04 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751653AbWBWTdE (ORCPT ); Thu, 23 Feb 2006 14:33:04 -0500 Received: from smtp.osdl.org ([65.172.181.4]:35980 "EHLO smtp.osdl.org") by vger.kernel.org with ESMTP id S1751640AbWBWTdC (ORCPT ); Thu, 23 Feb 2006 14:33:02 -0500 Date: Thu, 23 Feb 2006 11:32:52 -0800 (PST) From: Linus Torvalds To: "linux-os (Dick Johnson)" cc: Arjan van de Ven , Andi Kleen , linux-kernel@vger.kernel.org, akpm@osdl.org, mingo@elte.hu Subject: Re: Patch to reorder functions in the vmlinux to a defined order In-Reply-To: Message-ID: References: <1140700758.4672.51.camel@laptopd505.fenrus.org> <1140707358.4672.67.camel@laptopd505.fenrus.org> <200602231700.36333.ak@suse.de> <1140713001.4672.73.camel@laptopd505.fenrus.org> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1346 Lines: 36 On Thu, 23 Feb 2006, linux-os (Dick Johnson) wrote: > > > > Does anybody want to run benchmarks? (Totally untested, may not boot, > > might physically accost your pets for all I know). > > > > Linus > > I just reconfigured and rebuilt linux-2.6.15.4 to put PHYSICAL_START > at 0x00400000, unconditionally and it booted fine and is working so > a 'boot' shouldn't be a problem. I ended up doing even more. For me, running lmbench with this, it seems to improve some things by up to 20% (pipe bandwidth and latency, small file delete), some other things by 10% (larger file delete), and others not at all. Still, that 20% is _huge_. HOWEVER. I didn't compare very strictly. I should have done many more runs (I only did three), and more importantly, I should have compared the exact same kernel (I compared the new results against a kernel that was a couple of weeks old, so there were other differences). So it's a bit suspect. Finally, it might depend on the core a lot, and other cores might not get the same results. So somebody should do a much better test. I'm too lazy. Linus - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/