From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail203.messagelabs.com (mail203.messagelabs.com [216.82.254.243]) by kanga.kvack.org (Postfix) with SMTP id E99716B0044 for ; Fri, 18 Dec 2009 03:06:40 -0500 (EST) Date: Fri, 18 Dec 2009 09:06:31 +0100 From: Pavel Machek Subject: Re: Tmem [PATCH 0/5] (Take 3): Transcendent memory Message-ID: <20091218080631.GA1374@ucw.cz> References: <23e2d3ad-2611-4422-9349-50e4d3d8377f@default> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <23e2d3ad-2611-4422-9349-50e4d3d8377f@default> Sender: owner-linux-mm@kvack.org To: Dan Magenheimer Cc: linux-kernel@vger.kernel.org, npiggin@suse.de, akpm@osdl.org, jeremy@goop.org, xen-devel@lists.xensource.com, tmem-devel@oss.oracle.com, kurt.hackel@oracle.com, Russell , Rik van Riel , dave.mccracken@oracle.com, linux-mm@kvack.org, Rusty@rcsinet15.oracle.com, sunil.mushran@oracle.com, Avi Kivity , Schwidefsky , Balbir Singh , Marcelo Tosatti , alan@lxorguk.ukuu.org.uk, chris.mason@oracle.com List-ID: Hi! > Performance is difficult to quantify because some benchmarks respond > very favorably to increases in memory and tmem may do quite well on > those, depending on how much tmem is available which may vary widely > and dynamically, depending on conditions completely outside of the > system being measured. Ideas on how best to provide useful metrics > would be appreciated. So... take 1GB system, run your favourite benchmark. Then reserve 512MB for tmem, rerun your benchmark, then run the system with 512MB/512MB swap, rerun the benchmark? Tune the sizes so that first to last run differ by 100% or so, and see how much first and second differs? If it is in 1% range, you are probably doing good...? Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html -- 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