Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Fri, 4 Jan 2002 03:02:26 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Fri, 4 Jan 2002 03:02:17 -0500 Received: from smtp1.vol.cz ([195.250.128.73]:10770 "EHLO smtp1.vol.cz") by vger.kernel.org with ESMTP id ; Fri, 4 Jan 2002 03:01:59 -0500 Date: Thu, 3 Jan 2002 21:22:31 +0100 From: Pavel Machek To: Andre Hedrick Cc: linux-kernel@vger.kernel.org, linux-raid@vger.kernel.org Subject: Re: ATA RAID-0 FYI-Did the Impossible. Message-ID: <20020103212231.A1139@elf.ucw.cz> In-Reply-To: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.3.23i X-Warning: Reading this can be dangerous to your mental health. Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hi! > TIOBENCH > > No size specified, using 1792 MB > Size is MB, BlkSz is Bytes, Read, Write, and Seeks are MB/sec > > File Block Num Seq Read Rand Read Seq Write Rand Write > Dir Size Size Thr Rate (CPU%) Rate (CPU%) Rate (CPU%) Rate (CPU%) > ------- ------ ------- --- ----------- ----------- ----------- ----------- > . 1792 4096 1 153.6 98.1% 0.897 0.91% 85.59 51.2% 3.399 1.95% > . 1792 4096 2 104.7 67.8% 1.080 1.00% 79.63 58.4% 3.437 3.29% > . 1792 4096 4 91.57 61.2% 1.292 1.24% 76.45 59.3% 3.471 3.40% > . 1792 4096 8 83.55 57.3% 1.480 1.39% 73.80 59.2% 3.455 3.26% > > > File './Bonnie.1089', size: 1073741824, volumes: 1 > Writing with putc()... done: 9854 kB/s 100.0 %CPU > Rewriting... done: 65537 kB/s 52.2 %CPU > Writing intelligently...done: 109124 kB/s 51.0 %CPU > Reading with getc()... done: 9821 kB/s 99.9 %CPU > Reading intelligently...done: 167240 kB/s 97.6 %CPU > Seeker 1...Seeker 2...Seeker 3...start 'em...done...done...done... > ---Sequential Output (nosync)--- ---Sequential Input-- --Rnd Seek- > -Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --04k (03)- > Machine MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU > 1*1024 9854 100.0 109124 51.0 65537 52.2 9821 99.9 167240 97.6 1504.4 > 6.4 > > hdparm -t /dev/md0 > > /dev/md0: > Timing buffered disk reads: 64 MB in 0.47 seconds =136.17 MB/sec > > > hde: 39102336 sectors (20020 MB) w/2048KiB Cache, CHS=38792/16/63, UDMA(100) > hdg: 39102336 sectors (20020 MB) w/2048KiB Cache, CHS=38792/16/63, UDMA(100) > hdi: 39102336 sectors (20020 MB) w/2048KiB Cache, CHS=38792/16/63, UDMA(100) > hdk: 39102336 sectors (20020 MB) w/2048KiB Cache, CHS=38792/16/63, UDMA(100) > > /etc/raidtab > > raiddev /dev/md0 > raid-level 0 > nr-raid-disks 4 > persistent-superblock 0 > chunk-size > > device /dev/hd1 > raid-disk 0 > device /dev/hd1 > raid-disk 1 > device /dev/hd1 > raid-disk 2 > device /dev/hd1 > raid-disk 3 > > > If you want your system to have this kind of performance, that raise hell > to get the patches adopted into the main kernel. Raising hell is usually bad idea. What is so cool about that? You used raid0, that means individual disk has 35MB/sec. That does not seem too interesting to me. And... you can have as fast system as you want. That will not help your patches... Pavel -- (about SSSCA) "I don't say this lightly. However, I really think that the U.S. no longer is classifiable as a democracy, but rather as a plutocracy." --hpa - 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/