From owner-freebsd-questions@FreeBSD.ORG Mon May 9 19:42:17 2005 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 7B44C16A4FA for ; Mon, 9 May 2005 19:42:17 +0000 (GMT) Received: from manak.chamkila.org (node-40240ed2.sjc.onnet.us.uu.net [64.36.14.210]) by mx1.FreeBSD.org (Postfix) with ESMTP id 0732743D8F for ; Mon, 9 May 2005 19:42:17 +0000 (GMT) (envelope-from aman@chamkila.org) Received: from [192.168.96.214] ([69.36.228.194]) by manak.chamkila.org (8.12.10/8.12.10) with ESMTP id j49JcrXH019695; Mon, 9 May 2005 12:38:54 -0700 Message-ID: <427FBD12.2090101@chamkila.org> Date: Mon, 09 May 2005 12:42:10 -0700 From: Amandeep User-Agent: Mozilla Thunderbird 0.8 (Windows/20040913) 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> <427FAF73.7070702@centtech.com> <20050509190245.GF38839@dan.emsphone.com> <427FB663.3090309@chamkila.org> In-Reply-To: <427FB663.3090309@chamkila.org> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit cc: anderson@centtech.com cc: Dan Nelson cc: freebsd-questions@freebsd.org cc: john@essenz.com Subject: Re: Low HDD tranfer rate with FreeBSD 5.3-Release X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 09 May 2005 19:42:17 -0000 Amandeep wrote: > Dan Nelson wrote: > >> In the last episode (May 09), Eric Anderson said: >> >> >>>> Eric Anderson wrote: >>>> >>>> >>>>> Amandeep wrote: >>>>> >>>>> >>>>>> 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 >>>>>> >>>>> >>>> Shouldnt it be around 54MB/s for a regular IDE drive. >>>> >>> >>> 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. >>> >> >> >> Yes, try 64k instead of 8k, and also compare read speeds. If you have >> the time (could take an hour or so), try "dd if=/dev/ad0 of=/dev/null >> bs=64k", run an "iostat 60" in another window, let the dd run through >> the entire disk, and compare the relative speeds from start to finish. >> >> For the DiamondMax 160, the sustained throughput should be 26MB -> 50MB >> as you go from inner to outer tracks. >> >> >> > > OK with the above dd > > dd if=/dev/ad0 of=/dev/null bs=64k > > it gives me 56MB/s. from the start. > > Aman So how does the block size makes the difference?? What is the true transfer rate.? Aman > > > _______________________________________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to > "freebsd-questions-unsubscribe@freebsd.org" >