From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Tue, 28 Dec 2004 09:53:48 -0200 From: Marcelo Tosatti Subject: Re: Prezeroing V2 [0/3]: Why and When it works Message-ID: <20041228115348.GB25253@logos.cnet> References: <41C20E3E.3070209@yahoo.com.au> <16843.13418.630413.64809@cargo.ozlabs.ibm.com> <1103879668.4131.15.camel@laptopd505.fenrus.org> <20041227145057.4c5cd651.davem@davemloft.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20041227145057.4c5cd651.davem@davemloft.net> Sender: owner-linux-mm@kvack.org Return-Path: To: "David S. Miller" Cc: Linus Torvalds , arjan@infradead.org, paulus@samba.org, clameter@sgi.com, akpm@osdl.org, linux-ia64@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org List-ID: On Mon, Dec 27, 2004 at 02:50:57PM -0800, David S. Miller wrote: > On Fri, 24 Dec 2004 10:21:24 -0800 (PST) > Linus Torvalds wrote: > > > Absolutely. I would want to see some real benchmarks before we do this. > > Not just some microbenchmark of "how many page faults can we take without > > _using_ the page at all". > > Here's my small contribution. I did three "make -j3 vmlinux" timed > runs, one running a kernel without the pre-zeroing stuff applied, > one with it applied. It did shave a few seconds off the build > consistently. Here is the before: > > real 8m35.248s > user 15m54.132s > sys 1m1.098s > > real 8m32.202s > user 15m54.329s > sys 1m0.229s > > real 8m31.932s > user 15m54.160s > sys 1m0.245s > > and here is the after: > > real 8m29.375s > user 15m43.296s > sys 0m59.549s > > real 8m28.213s > user 15m39.819s > sys 0m58.790s > > real 8m26.140s > user 15m44.145s > sys 0m58.872s Christopher and other SGI fellows, Get your patch into STP, once its there we can do some wider x86 benchmarking easily. -- 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: aart@kvack.org