From owner-freebsd-hackers@FreeBSD.ORG Mon May 9 18:44:15 2005 Return-Path: Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 8919416A4EA; Mon, 9 May 2005 18:44:15 +0000 (GMT) Received: from mh1.centtech.com (moat3.centtech.com [207.200.51.50]) by mx1.FreeBSD.org (Postfix) with ESMTP id C6AB043DA3; Mon, 9 May 2005 18:44:14 +0000 (GMT) (envelope-from anderson@centtech.com) Received: from [10.177.171.220] (neutrino.centtech.com [10.177.171.220]) by mh1.centtech.com (8.13.1/8.13.1) with ESMTP id j49IiAtB084220; Mon, 9 May 2005 13:44:10 -0500 (CDT) (envelope-from anderson@centtech.com) Message-ID: <427FAF73.7070702@centtech.com> Date: Mon, 09 May 2005 13:44:03 -0500 From: Eric Anderson User-Agent: Mozilla/5.0 (X11; U; FreeBSD i386; en-US; rv:1.7.7) Gecko/20050504 X-Accept-Language: en-us, en MIME-Version: 1.0 To: Amandeep References: <427FA802.90805@chamkila.org> <427FA8CD.8040405@centtech.com> <427FAB5F.6070508@chamkila.org> In-Reply-To: <427FAB5F.6070508@chamkila.org> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit X-Virus-Scanned: ClamAV 0.82/873/Mon May 9 11:36:51 2005 on mh1.centtech.com X-Virus-Status: Clean cc: freebsd-hackers@freebsd.org cc: freebsd-questions@freebsd.org cc: john@essenz.com Subject: Re: Low HDD tranfer rate with FreeBSD 5.3-Release X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 09 May 2005 18:44:15 -0000 > Eric Anderson wrote: > >> Amandeep wrote: >> >>> Hi all, >>> >>> I am using Tyan S2098 MB with 160GB Maxtor ATA Drive and the >>> transfer rate is very low. FreeBSD 5.3-Release. >>> Any ideas what is going on here. >>> >>> The transfer rate is about 15MB/s >>> >>> when I run >>> #dd if=/dev/zero of=/usr/junk bs=8192 >>> >>> then do >>> #iostat 1 >> >> >> >> You should probably provide the appropriate information from dmesg >> output, along with what you expect it to be, and the outputs of the dd >> command. >> >> Eric >> Amandeep wrote: > Hi Eric, > > > Shouldnt it be around 54MB/s for a regular IDE drive. > > Here is the output of dmesg and iostat [..snip dmesg blob..] > IOSTAT > > tty ad0 cpu > tin tout KB/t tps MB/s us ni sy in id > 0 20 114.15 10 1.09 0 0 1 0 98 > 0 0 0.00 0 0.00 0 0 0 0 100 > 0 0 0.00 0 0.00 0 0 0 0 100 > 1 3 128.00 21 2.60 0 0 3 0 97 > 0 0 128.00 124 15.47 0 0 6 2 91 [..snip iostat blob..] (please try to avoid top-posting, it's hard to follow) What about other block sizes? Also - you should paste your actual dd output here too. What's the model number of that drive? Maxtor claims (on one of their 160G drives) 17.8MB/s from inner diameter disk and 35.6MB/s for outer diameter for the 5400rpm drives. Eric -- ------------------------------------------------------------------------ Eric Anderson Sr. Systems Administrator Centaur Technology A lost ounce of gold may be found, a lost moment of time never. ------------------------------------------------------------------------