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Path: sserve!newshost.anu.edu.au!munnari.oz.au!foxhound.dsto.gov.au!fang.dsto.gov.au!myall.awadi.com.au!myall!blymn From: blymn@awadi.com.au (Brett Lymn (master of the siren)) Newsgroups: comp.os.386bsd.questions Subject: Re: CDROM support Date: 09 Jan 1994 08:52:40 GMT Organization: AWA Defence Industries Pty. Ltd. Lines: 20 Message-ID: <BLYMN.94Jan9192240@siren.awadi.com.au> References: <2g5qaq$ng0@u.cc.utah.edu> <DykkFc3w165w@oasys.pc.my> NNTP-Posting-Host: siren.awadi.com.au In-reply-to: othman@oasys.pc.my's message of Mon, 03 Jan 94 09:16:36 +800 >>>>> "Othman" == Othman Ahmad <othman@oasys.pc.my> writes: In article <DykkFc3w165w@oasys.pc.my> othman@oasys.pc.my (Othman Ahmad) writes: Othman> terry@cs.weber.edu (A Wizard of Earth C) writes: >> the SoundBlaster SCSI, which wants a CPU-intensive driver to push >> its bits for it, unlike decent, God-fearing SCSI cards that will do >> bus-mastering Othman> Beware though that direct memory read can be faster than any Othman> DMA given the right processor. Uh... ok tell us about it, this should be a doozy. Personally I cannot see how any processor doing instruction fetch, decode, address calc, read, instruction fetch, decode, address calc, write ... and so on could be faster than DMA stuffing data into memory and remember we are talking disk transactions here not single byte transfers. -- Brett Lymn