Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ames!pasteur!helios.ee.lbl.gov!nosc!logicon.arpa!Makey
From: Makey@LOGICON.ARPA (Jeff Makey)
Newsgroups: comp.protocols.tcp-ip
Subject: Re: interrupt-driven vs. polled I/O performance
Message-ID: <421@logicon.arpa>
Date: 25 Apr 89 01:01:01 GMT
References: <25231@amdcad.AMD.COM>
Organization: Logicon, Inc., San Diego, CA
Lines: 20

In article <25231@amdcad.AMD.COM> rpw3@amdcad.UUCP (Rob Warnock) writes:
>But the echo delay doesn't need to be kept to a *minimum*, but only
>well below the objectionable level to the human user.
 [...]
>I claim that 100ms for echo is not noticable to a user of a video
>display

Your point about only needing to keep echo delay below the level of
perception is well taken.  However, 100ms is 1/10 second, which I am
sure I would find quite noticeable (my terminal runs at 19,200 baud).
Taking a cue from motion pictures, I would assume that 1/30 second is
the order of magnitude of the level of perception, but I would want to
perform some experiments with different delays and lots of people to
make sure.

                           :: Jeff Makey

Department of Tautological Pleonasms and Superfluous Redundancies Department
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