Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Sat, 14 Apr 2001 06:38:16 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Sat, 14 Apr 2001 06:38:06 -0400 Received: from mailout01.sul.t-online.com ([194.25.134.80]:52237 "EHLO mailout01.sul.t-online.com") by vger.kernel.org with ESMTP id convert rfc822-to-8bit; Sat, 14 Apr 2001 06:37:55 -0400 Content-Type: text/plain; charset=US-ASCII From: Andreas Peter To: linux-kernel@vger.kernel.org Subject: Re: SW-RAID0 Performance problems Date: Sat, 14 Apr 2001 12:45:07 +0200 X-Mailer: KMail [version 1.2] In-Reply-To: <20010413090751.E4557@greenhydrant.com> <3AD7416A.A6B65A86@bigfoot.com> In-Reply-To: <3AD7416A.A6B65A86@bigfoot.com> MIME-Version: 1.0 Message-Id: <01041412085801.00516@debian> Content-Transfer-Encoding: 7BIT Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Am Freitag, 13. April 2001 20:11 schrieb Tim Moore: > Try 'hdparm -tT' with simultaneous /dev/hda3 and /dev/hdc3. This gives > you a baseline on the actual partitions involved. hdparm -tT simultanous on /dev/hda3 and /dev/hdc3: /dev/hda3: Timing buffer-cache reads: 128 MB in 2.29 seconds = 55.90 MB/sec Timing buffered disk reads: 64 MB in 4.67 seconds = 13.70 MB/sec /dev/hdc3: Timing buffer-cache reads: 128 MB in 2.28 seconds = 56.14 MB/sec Timing buffered disk reads: 64 MB in 4.61 seconds = 13.88 MB/sec Now on single HD - /dev/hda3 : /dev/hda3: Timing buffer-cache reads: 128 MB in 1.30 seconds = 98.46 MB/sec Timing buffered disk reads: 64 MB in 2.26 seconds = 28.32 MB/sec It looks like reading on /dev/hda3 locks /dev/hdc3 ... Is it necessary to apply the ide-patches to the kernel ? Andreas -- Andreas Peter *** ujq7@rz.uni-karlsruhe.de - 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/