From owner-freebsd-fs Tue Sep 19 8:50:34 2000 Delivered-To: freebsd-fs@freebsd.org Received: from critter.freebsd.dk (flutter.freebsd.dk [212.242.40.147]) by hub.freebsd.org (Postfix) with ESMTP id 7056337B422; Tue, 19 Sep 2000 08:50:30 -0700 (PDT) Received: from critter (localhost [127.0.0.1]) by critter.freebsd.dk (8.11.0/8.9.3) with ESMTP id e8JFoQN91118; Tue, 19 Sep 2000 17:50:26 +0200 (CEST) (envelope-from phk@critter.freebsd.dk) To: Marc Tardif Cc: freebsd-fs@FreeBSD.ORG, freebsd-hackers@FreeBSD.ORG Subject: Re: device timings In-Reply-To: Your message of "Tue, 19 Sep 2000 11:45:40 EDT." Date: Tue, 19 Sep 2000 17:50:26 +0200 Message-ID: <91116.969378626@critter> From: Poul-Henning Kamp Sender: owner-freebsd-fs@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org In message , Marc Tard if writes: >Now considering the following timings done with dd, how come I get such >different transfer rates (bytes/sec) for s1 and s2? I understand there >should be a difference between the block and character interface, as shown >in the first two timings, but why isn't the same difference shown for the >last two timings? Because all modern disks use "zone-layout" where there are typically 50% more sectors in the outher cylinders compared to the inner cylinders. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD coreteam member | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-fs" in the body of the message