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From: feg@cbnewsb.cb.att.com (forrest.e.gehrke)
Newsgroups: comp.os.msdos.desqview
Subject: Qemm slows floating point
Keywords: Any solution?
Message-ID: <1991May14.123233.17734@cbfsb.att.com>
Date: 14 May 91 12:32:33 GMT
Sender: news@cbfsb.att.com
Distribution: na
Organization: AT&T Bell Laboratories
Lines: 29

I have a Gateway 386/33 with Micronics Asic motherboard
and no coprocessor.  4MB ram, 32 ram cache.

When I load qemm.sys and run a Whetstone benchmark (or any
floating point operations program), I find that there is
about a 30% reduction in speed.  This occurs even with 
no features of qemm in use, i.e. merely loading qemm.sys
with the line   device=c:\qemm.sys with no other parameters
in the config.sys file, and no programs loaded into
high memory.

Removing that line from config.sys will show a 30%
improvement in floating point operations speed.
For example, Gateway includes with the Micronics
motherboard a program QAPLUS which has the Whetstone
benchmark.  Without QEMM.SYS loaded this benchmark
will report 202.1 whetstones/sec.  With QEMM.SYS loaded
this will drop to 154 whetstones/sec.

I can not envision any reason for these results unless
QEMM inserts useless code to be executed when floating
point operations are involved.  The same QAPLUS includes
the Dhrystone benchmark; there is no difference in its
report with or without QEMM.SYS loaded.

Has anyone else noticed this?  Is there a solution
for it?

Forrest Gehrke feg\@floyd.att.com