[comp.sys.ibm.pc] QEMM 5.0 Slo-o-o-ows DMA

blombardi@x102c.ess.harris.com (Bob Lombardi 44139) (07/11/90)

My posting "QEMM 5.0 Sl-o-o-ows Down DMA" generated several E-Mail
replies and started a line of discussion.  I thought I'd follow-up
to the net with what my conclusions are.

In twenty-five words or less, the discrepancy is coming from Checkit
itself, not from running QEMM.  Every other test I can run shows a
marginal slowdown at worst, nothing that comes close to the 15 times
slowdown in DMA that Checkit claims.  Quarterdeck customer service had
no existing answer to the question, but did say that they've seen some
benchmarks act strangely in virtual 86 mode.  None of their suggestions
yielded any improvement to Checkit.

I have run other benchmarks, including the PC Magazine Benchmarks, and
find no difference of any significance bewteen QEMM/noQEMM configuration
results.  

I am a double E, so I don't expect to get something for nothing; the
apparent 15 times slowdown was a bit expensive, though.  (I don't _do_
bits, though, I'm a Microwave/RF guy.  It seems that the system could
really slow down that much, if they didn't know what they were doing.)

Thanks to all who replied....

Bob 

~a




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