From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Thu, 23 Jan 2003 20:11:25 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Thu, 23 Jan 2003 20:11:25 -0500 Received: from albatross.mail.pas.earthlink.net ([207.217.120.120]:35522 "EHLO albatross.mail.pas.earthlink.net") by vger.kernel.org with ESMTP id ; Thu, 23 Jan 2003 20:11:24 -0500 Date: Thu, 23 Jan 2003 20:26:18 -0500 To: akpm@digeo.com Cc: linux-kernel@vger.kernel.org, lse-tech@lists.sourceforge.net Subject: Re: big ext3 sequential write improvement in 2.5.51-mm1 gone in 2.5.53-mm1? Message-ID: <20030124012618.GA12005@rushmore> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.4i From: rwhron@earthlink.net Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org >> >lovely. These two files have perfectly intermingled blocks. >> Writeback? or read? > Both. > The fileystems need fixing.... Did you add a secret sauce to 2.5.59-mm2? 10x sequential write improvement on ext3 for multiple tiobench threads. Quad P3 Xeon (4GB ram) 8 GB files 4K blocksize 32 threads Rate = MB/sec latency in milliseconds Sequential Writes ext3 Avg Maximum Lat% Lat% CPU Kernel Rate (CPU%) Latency Latency >2s >10s Eff ---------- ------------------------------------------------------------ 2.4.20aa1 11.85 72.77% 11.814 21802.73 0.05036 0.00000 16 2.5.59 3.42 17.36% 83.976 3109518.52 0.11253 0.05088 20 2.5.59-mm2 32.39 34.28% 7.742 340597.62 0.04287 0.01765 94 Similar improvement for seq writes for 2, 4, 8, 16, 64, 128, 256 threads. Sequential reads on ext3 with 2.5.59-mm2 improves around 3x for various thread counts. Below is 32 threads. Sequential Reads ext3 Avg Maximum Lat% Lat% CPU Kernel Rate (CPU%) Latency Latency >2s >10s Eff ---------- ------------------------------------------------------------ 2.4.20aa1 8.24 7.21% 28.587 449134.11 0.10395 0.07086 114 2.5.59 9.50 5.50% 36.703 4310.62 0.00000 0.00000 173 2.5.59-mm2 35.28 17.69% 10.173 18950.56 0.01010 0.00000 199 -- Randy Hron http://home.earthlink.net/~rwhron/kernel/bigbox.html