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Path: utzoo!linus!decvax!ima!haddock!lee
From: lee@haddock
Newsgroups: net.micro.pc
Subject: Re: Real-time on the PC-RT?
Message-ID: <87300001@haddock>
Date: Thu, 13-Mar-86 10:10:00 EST
Article-I.D.: haddock.87300001
Posted: Thu Mar 13 10:10:00 1986
Date-Received: Mon, 31-Mar-86 03:46:53 EST
References: <1620@dalcs.UUCP>
Lines: 10
Nf-ID: #R:dalcs.UUCP:1620:haddock:87300001:000:647
Nf-From: haddock!lee    Mar 13 10:10:00 1986


It depends on the nature of the sensing device and the need for the Unix
program to respond to real-time input with real-time output.  For example,
if the requirement is just to absorb high-speed asynchronous line data,
the RT will work very well; the machine can take several lines at full speed
without losing characters.  However, if the Unix program must respond in real
time with control information, the RT does not improve on Unix's inadequate
real time behavior.  There are, in fact, even more sources for real-time
delays in AIX than in other Unix systems, due to VRM low level processing of,
for example, 286 coprocessor board handling.