Date: Wed, 20 May 1998 22:53:34 +0930 From: Matthew Thyer <thyerm@camtech.net.au> To: sos@FreeBSD.ORG Cc: Luigi Rizzo <luigi@labinfo.iet.unipi.it>, hasty@rah.star-gate.com, regnauld@deepo.prosa.dk, current@FreeBSD.ORG Subject: Re: ATAPI CDDA Extraction under FreeBSD Message-ID: <3562D956.8682E5D1@camtech.net.au> References: <199805182006.WAA00312@sos.freebsd.dk>
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I'm sure I've seen multi block IO of 32 on one drive so don't rule out 16K. Maybe it was the Maxtor that blew up the other month... not sure. I dont have that drive any more so I can't give details. Søren Schmidt wrote: > > In reply to Luigi Rizzo who wrote: > > > It should be possible, at least it seems so from testing... > > > Big multi sector transfers post a problem though... > > > > how big is big ? is it 64K or it can be much larger ? In any case, > > it should not be much of a problem given that several atapi drives can > > transfer audio faster than 1x, so a small buffer should suffice. > > No most (if not all) disks I've seen has a max of 16 secs at once > ie 8K... > > > (and in any case, i fail to see why one would want to grab live > > digital audio data from a CD to pump it straight into the DAC of > > the audio card, when there is a direct analog connection that would > > consume zero cpu and zero bus bandwidth...) > > Exactly... > > -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- > Søren Schmidt (sos@FreeBSD.org) FreeBSD Core Team > Even more code to hack -- will it ever end > .. > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-current" in the body of the message -- /=====================================================================\ |Work: Matthew.Thyer@dsto.defence.gov.au | Home: thyerm@camtech.net.au| \=====================================================================/ "If it is true that our Universe has a zero net value for all conserved quantities, then it may simply be a fluctuation of the vacuum of some larger space in which our Universe is imbedded. In answer to the question of why it happened, I offer the modest proposal that our Universe is simply one of those things which happen from time to time." E. P. Tryon from "Nature" Vol.246 Dec.14, 1973 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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