Date: Tue, 19 Sep 2000 17:50:26 +0200 From: Poul-Henning Kamp <phk@critter.freebsd.dk> To: Marc Tardif <intmktg@CAM.ORG> Cc: freebsd-fs@FreeBSD.ORG, freebsd-hackers@FreeBSD.ORG Subject: Re: device timings Message-ID: <91116.969378626@critter> In-Reply-To: Your message of "Tue, 19 Sep 2000 11:45:40 EDT." <Pine.LNX.4.10.10009191138220.8544-100000@Gloria.CAM.ORG>
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In message <Pine.LNX.4.10.10009191138220.8544-100000@Gloria.CAM.ORG>, 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-hackers" in the body of the message
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