From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1763931AbXGLMHR (ORCPT ); Thu, 12 Jul 2007 08:07:17 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753603AbXGLMHE (ORCPT ); Thu, 12 Jul 2007 08:07:04 -0400 Received: from ug-out-1314.google.com ([66.249.92.168]:40333 "EHLO ug-out-1314.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753156AbXGLMHB (ORCPT ); Thu, 12 Jul 2007 08:07:01 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:message-id:date:from:sender:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references:x-google-sender-auth; b=fAg6/xbDOv2Ss606ONwUbAVC10NWROzVxKNjriBThmi6XjMTB9r49mdktylpuodVOfL9MslsqM/lMMclYXfBlUWGhAIujoaAkU+FG/oIOyTQ5pO0g+1VXbUufq7YkFAGlaXLk3M7rFZ7A13q8QVXdVpKYaAk5vXYQkbtgSSmU/M= Message-ID: <367a23780707120506o423f6352h5edeca8535135068@mail.gmail.com> Date: Thu, 12 Jul 2007 14:06:54 +0200 From: "Kacper Wysocki" To: "Andrew Morton" Subject: Re: [ck] Re: -mm merge plans for 2.6.23 Cc: "Matthew Hawkins" , linux-kernel@vger.kernel.org, "Con Kolivas" , "ck list" , linux-mm@kvack.org, "Paul Jackson" In-Reply-To: <20070710181419.6d1b2f7e.akpm@linux-foundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <20070710013152.ef2cd200.akpm@linux-foundation.org> <200707102015.44004.kernel@kolivas.org> <20070710181419.6d1b2f7e.akpm@linux-foundation.org> X-Google-Sender-Auth: 2ac1a9897ab4ed2c Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On 7/11/07, Andrew Morton wrote: > On Wed, 11 Jul 2007 11:02:56 +1000 "Matthew Hawkins" wrote: > > > 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 important > > and quantifiable performance increase to desktop systems. > > Always interested. Please provide us more details on your usage and > testing of that code. Amount of memory, workload, observed results, > etc? Swap prefetch has been around for years, and it's a complete boon for the desktop user and a noop in any other situation. In addition to the sp_tester tool which consistently shows a definite advantage, there are many user reports that show the noticeable improvements it has. The many people who have tried it out have generally chosen to switch to patched kernels because of the performance increase. It's been discussed on the lkml many times before, we've been over performance, testing and impact. The big question is: why *don't* we merge it? -Kacper