Date: Wed, 26 Sep 2001 06:49:14 +1000 From: Peter Jeremy <peter.jeremy@alcatel.com.au> To: "David W. Chapman Jr." <dwcjr@inethouston.net> Cc: freebsd-stable@FreeBSD.ORG Subject: Re: hw.ata.wc && hw.ata.tags && softupdates short question Message-ID: <20010926064914.J75481@gsmx07.alcatel.com.au> In-Reply-To: <20010920222727.E78811@leviathan.inethouston.net>; from dwcjr@inethouston.net on Thu, Sep 20, 2001 at 10:27:27PM -0500 References: <20010920211704.C7820@gateway.bogus> <XFMail.20010921121832.doconnor@gsoft.com.au> <20010920215107.B78811@leviathan.inethouston.net> <107060000.1001041983@vpn58.ece.cmu.edu> <20010920222727.E78811@leviathan.inethouston.net>
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On Thu, Sep 20, 2001 at 10:27:27PM -0500, David W. Chapman Jr. wrote: >I'm just speculating, but on my drive with 2mb cache, that can >sustain 20-30mb/sec writting, that's a tenth of a second. Assuming that the cache contains 2MB of sequential data... A more likely scenario is that the cache contains 100-200 chunks of data scattered all over the disk. 100 seek/latency cycles will stretch that 0.1 sec to more like a second and seeks are very energy-intensive. Peter To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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