Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Sat, 11 Jan 2003 01:21:19 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Sat, 11 Jan 2003 01:21:19 -0500 Received: from mail.mediaways.net ([193.189.224.113]:5596 "HELO mail.mediaways.net") by vger.kernel.org with SMTP id ; Sat, 11 Jan 2003 01:21:17 -0500 Subject: choice of raid5 checksumming algorithm wrong ? From: Soeren Sonnenburg To: Linux Kernel Mailing List Content-Type: text/plain Organization: Message-Id: <1042266405.14440.54.camel@sun> Mime-Version: 1.0 Date: 11 Jan 2003 07:26:45 +0100 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1845 Lines: 43 Hi! I really do wonder whether the displayed message is wrong or why it always chooses the slowest checksumming function (happens with 2.4.19 - 21pre3) 2.4.20: Jan 7 18:32:22 sun kernel: raid5: measuring checksumming speed Jan 7 18:32:22 sun kernel: 8regs : 3054.400 MB/sec Jan 7 18:32:22 sun kernel: 32regs : 2696.800 MB/sec Jan 7 18:32:22 sun kernel: pIII_sse : 1614.000 MB/sec Jan 7 18:32:22 sun kernel: pII_mmx : 4672.000 MB/sec Jan 7 18:32:22 sun kernel: p5_mmx : 5984.000 MB/sec Jan 7 18:32:22 sun kernel: raid5: using function: pIII_sse (1614.000 MB/sec) 21pre2: Jan 5 19:18:47 sun kernel: raid5: measuring checksumming speed Jan 5 19:18:47 sun kernel: 8regs : 3054.000 MB/sec Jan 5 19:18:47 sun kernel: 32regs : 2697.200 MB/sec Jan 5 19:18:47 sun kernel: pIII_sse : 2574.000 MB/sec Jan 5 19:18:47 sun kernel: pII_mmx : 4671.600 MB/sec Jan 5 19:18:47 sun kernel: p5_mmx : 5984.000 MB/sec Jan 5 19:18:47 sun kernel: raid5: using function: pIII_sse (2574.000 MB/sec) Jan 5 19:18:47 sun kernel: md: md driver 0.90.0 MAX_MD_DEVS=256, MD_SB_DISKS=27 21pre3: Jan 7 21:38:12 sun kernel: raid5: measuring checksumming speed Jan 7 21:38:12 sun kernel: 8regs : 3055.200 MB/sec Jan 7 21:38:12 sun kernel: 32regs : 2697.200 MB/sec Jan 7 21:38:12 sun kernel: pIII_sse : 5658.400 MB/sec Jan 7 21:38:12 sun kernel: pII_mmx : 4672.400 MB/sec Jan 7 21:38:12 sun kernel: p5_mmx : 5984.800 MB/sec Jan 7 21:38:12 sun kernel: raid5: using function: pIII_sse (5658.400 MB/sec) it is always the same system...athlon xp2.4+... Soeren. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/