Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!cs.utexas.edu!sun-barr!decwrl!fernwood!asylum!romkey
From: romkey@asylum.SF.CA.US (John Romkey)
Newsgroups: comp.unix.xenix
Subject: Re: Disk IO under SCO
Message-ID: <3836@asylum.SF.CA.US>
Date: 7 Sep 89 00:45:35 GMT
References: <1049@lakesys.UUCP>
Reply-To: romkey@asylum.UUCP (Super user)
Distribution: comp.unix.xenix
Organization: The Asylum; Belmont, CA
Lines: 8

In article <1049@lakesys.UUCP> davef@lakesys.UUCP (Dave Fenske) writes:
>I'm not certain that I understand all of the rationale for the way in which
>SCO handles disk IO.  For example, they avoid DMA in favor of program control.

SCO avoids DMA because in the PC/AT architecture (and therefore the
ensuing 386 clones built out of it) DMA is SLOW and a processor string
instruction with a repeat prefix will improve performance tremendously
over what the DMA controller will get you.
			- john romkey
USENET/UUCP: romkey@asylum.sf.ca.us	Internet: romkey@ftp.com
"God is good, God is great, God's a big inverterbrate." - Boiled In Lead