Date: Tue, 12 Sep 1995 13:54:10 +0200 (MET DST) From: J Wunsch <j@uriah.heep.sax.de> To: hackers@freebsd.org Subject: Re: higher density diskettes Message-ID: <199509121154.NAA29200@uriah.heep.sax.de> In-Reply-To: <199509120758.RAA15898@godzilla.zeta.org.au> from "Bruce Evans" at Sep 12, 95 05:58:58 pm
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As Bruce Evans wrote: > > ... The FreeBSD driver uses a head > settle delay of hz/16 ticks, i.e., between 50 and 60 ms. This is much > longer than necessary. I think the spec is 15 msec. The spec suffers from a lack of reality. We've once had hz/32, and got (too) many problem reports. That's why the more conservative value has been used. I know that the existing driver is not at the end of optimization, but i'm not sure whether a potential gain of 25 % or less in speed would be worth the effort. People usually only recognize speed changes by a factor of 2 or more. -- cheers, J"org joerg_wunsch@uriah.heep.sax.de -- http://www.sax.de/~joerg/ Never trust an operating system you don't have sources for. ;-)
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