Disk IO under SCO
John Romkey
romkey at asylum.SF.CA.US
Thu Sep 7 10:45:35 AEST 1989
In article <1049 at lakesys.UUCP> davef at 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 at asylum.sf.ca.us Internet: romkey at ftp.com
"God is good, God is great, God's a big inverterbrate." - Boiled In Lead
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