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From: tcumming@thinkthink.com (Tom Cumming)
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: Mulitithreading SCSI commands and aic7870 driver question
Date: 18 Mar 1997 21:03:23 GMT
Organization: thinkthink
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Xref: euryale.cc.adfa.oz.au comp.unix.bsd.freebsd.misc:37409
I've got an Ancot SCSI analizer hooked up between a 200Mhz Pentium Pro /w a 2940UW and a
fast-20 (Ultra) wide target. I'm running FreeBSD 3.0-970209-SNAP kernel with AHC_TAGENABLE option
set in the config. I get tag queue messages fine, try as I may, I *never* see overlapped scsi
commands. In fact, the commands all had a queue tag of 0. What gives? I would think that a PP200
could crank cdbs fast 'nuff to get multiple commands outstanding. We do it all the time with a dec
alpha (with dec's os/hardware).
Tom C.