From owner-freebsd-mobile Tue Oct 22 7:14: 0 2002 Delivered-To: freebsd-mobile@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id C735C37B401 for ; Tue, 22 Oct 2002 07:13:58 -0700 (PDT) Received: from post-20.mail.nl.demon.net (post-20.mail.nl.demon.net [194.159.73.1]) by mx1.FreeBSD.org (Postfix) with ESMTP id D48FF43E75 for ; Tue, 22 Oct 2002 07:13:57 -0700 (PDT) (envelope-from h.kroonen@brinktech.nl) Received: from [195.173.234.248] (helo=server.brinktech.demon.nl) by post-20.mail.nl.demon.net with esmtp (Exim 3.36 #1) id 183znA-000Oqe-00 for freebsd-mobile@FreeBSD.ORG; Tue, 22 Oct 2002 14:13:57 +0000 Received: from harry (unknown [192.168.1.99]) by server.brinktech.demon.nl (Postfix) with ESMTP id 5502E7ABD; Tue, 22 Oct 2002 16:15:03 +0200 (CEST) From: "Harry Kroonen" To: FreeBSD Laptoppers Date: Tue, 22 Oct 2002 16:15:01 +0200 MIME-Version: 1.0 Subject: Re: hard drive Reply-To: h.kroonen@brinktech.nl Cc: FreeBSD Laptoppers Message-ID: <3DB57985.5105.6BB988A@localhost> In-reply-to: <20021021052818.GA554@laptop.6bone.nl> References: X-mailer: Pegasus Mail for Windows (v4.01) Content-type: text/plain; charset=US-ASCII Content-transfer-encoding: 7BIT Content-description: Mail message body Sender: owner-freebsd-mobile@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.org Date sent: Mon, 21 Oct 2002 07:28:19 +0200 From: Mark Santcroos To: Randy Bush Copies to: FreeBSD Laptoppers Subject: Re: hard drive > On Sun, Oct 20, 2002 at 12:26:25PM -0700, Randy Bush wrote: > > for me, the bottleneck on laptops is the disk throughput. the hard > > drives themselves are slow, and the bandwidth to them sucks. for > > big makes etc., a 10GHz cpu would not improve throughput as much as > > doubling the disk goodput. > > > > is anybody making laptoys with real disk i/o subsystems? > > Imho the gap between desktop and laptop is getting smaller. There are > quite some laptops shipping with UDMA100 now. > > "dd if=/dev/ad0 of=/dev/null bs=4096" gives me 22 MB/s. I don't have a > recent desktop so I don't know how this compares to recent desktop > performance but I don't think it is bad. As some general info: I just did the same (count=10000) on a 'recent desktop' AMD1333 with ATA100 / 7200rpm Maxtor 740-DX drives, ad0 (40GB) giving me 22MB/s, ad4 (80GB) at 34MB/s. Laptop Celeron 500 / IBM HD : 16 MB/s More important in the laptop-arena is the difference in available HD's. With two laptops and two HD's I measured the time for "ls -lR /usr/ports" (and yes, both directories were identical ;-) ): Celeron 500 / IBM DJSA-220 : 1m56s Celeron 1100 / IBM DJSA-220 : 1m37s Celeron 500 / toshiba MK2018 : 6m21s Celeron 1100 / toshiba MK2018 : 5m35s (ls -lR /usr/ports on my desktop -> 0m40s) The toshiba was standard with the 1100-laptop (low-budget, from 2 months ago so I should expect that sort of performance), the IBM was a replacement drive (for the 500) bought separately about a year ago. So it looks to be more a difference of access time than of basic throughput. Anyway, just a few numbers, nothing scientific, Harry To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-mobile" in the body of the message