From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759594AbXGKCzG (ORCPT ); Tue, 10 Jul 2007 22:55:06 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753814AbXGKCyx (ORCPT ); Tue, 10 Jul 2007 22:54:53 -0400 Received: from gilford.textdrive.com ([207.7.108.53]:63098 "EHLO gilford.textdrive.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758942AbXGKCyv (ORCPT ); Tue, 10 Jul 2007 22:54:51 -0400 X-Greylist: delayed 1975 seconds by postgrey-1.27 at vger.kernel.org; Tue, 10 Jul 2007 22:54:51 EDT Date: Tue, 10 Jul 2007 20:21:23 -0600 From: Ira Snyder To: Andrew Morton Cc: "Matthew Hawkins" , linux-kernel@vger.kernel.org, Con Kolivas , ck list , linux-mm@kvack.org, Paul Jackson Subject: Re: [ck] Re: -mm merge plans for 2.6.23 Message-Id: <20070710202123.d819835e.kernel@irasnyder.com> In-Reply-To: <20070710181419.6d1b2f7e.akpm@linux-foundation.org> References: <20070710013152.ef2cd200.akpm@linux-foundation.org> <200707102015.44004.kernel@kolivas.org> <20070710181419.6d1b2f7e.akpm@linux-foundation.org> X-Mailer: Sylpheed 2.4.2 (GTK+ 2.10.13; i686-pc-linux-gnu) Mime-Version: 1.0 Content-Type: multipart/signed; protocol="application/pgp-signature"; micalg="PGP-SHA1"; boundary="Signature=_Tue__10_Jul_2007_20_21_23_-0600_A+QX21NFDGxiEG5O" Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org --Signature=_Tue__10_Jul_2007_20_21_23_-0600_A+QX21NFDGxiEG5O Content-Type: text/plain; charset=US-ASCII Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Tue, 10 Jul 2007 18:14:19 -0700 Andrew Morton wrote: > On Wed, 11 Jul 2007 11:02:56 +1000 "Matthew Hawkins" = wrote: >=20 > > We all know swap prefetch has been tested out the wazoo since Moses was= a > > little boy, is compile-time and runtime selectable, and gives an import= ant > > and quantifiable performance increase to desktop systems. >=20 > Always interested. Please provide us more details on your usage and > testing of that code. Amount of memory, workload, observed results, > etc? >=20 I often leave long compiles running overnight (I'm a gentoo user). I always= have the desktop running, with quite a few applications open, usually fire= fox, amarok, sylpheed, and liferea at the minimum. I've recently tried usin= g a "stock" gentoo kernel, without the swap prefetch patch, and in the morn= ing when I get on the computer, it hits the disk pretty hard pulling my app= lications (especially firefox) in from swap. With swap prefetch, the system= responds like I expect: quick. It doesn't hit the swap at all, at least th= at I can tell. Swap prefetch definitely makes a difference for me: it makes my experience = MUCH better. My system is a Core Duo 1.83GHz laptop, with 1GB ram and a 5400 rpm disk. W= ith the disk being so slow, the less I hit swap, the better. I'll cast my vote to merge swap prefetch. --Signature=_Tue__10_Jul_2007_20_21_23_-0600_A+QX21NFDGxiEG5O Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.4 (GNU/Linux) iD8DBQFGlD6oqvO4Mr6SCJURApoWAKCrUb3d93byOsQ/VkIm/urz//x65QCfQfSa GvRsvmXfiOTvV8YFhOR7ryM= =Ztn3 -----END PGP SIGNATURE----- --Signature=_Tue__10_Jul_2007_20_21_23_-0600_A+QX21NFDGxiEG5O--