11/73,2.9,large amounts of output,he

[kwthomas at uokmet.UUCP]

>Configuration:
>	PDP 11/73, 1MEG, Emulex cs01/16 lines, 2 RL02's (RLV controler)
>	2.9BSD software
>Problem:
>	when running 'yes jfdljfldjflsjfdsjflsdlfjdsjfsljdsdjlfjsljfds'
>	or any program that outputs large amounts of data to the terminal
>	and running several terminals ( > 2) together, the programs start
>	spitting out info that looks like the kernel stuff, i.e. garbage chars.
>
>	If I touch the control-S (^S), and stop the output, then control-Q,
>	the output starts up ok again.  Note, that the problem can come back
>	and that it doesn't happen to all terminals.  If I start with 10
>	running, by the next morning only 2 or 3 are left ok.
>
>	If have UCB_CLIST defined and undefined.

We have strange problems for a while with ^S and ^Q.  When 3 or more people
did a ^S to stop output, our system (PDP 11/44 with 2.9BSD) would freeze
dead in its tracks.  Checking the PC indicated that the operating system
was spinning around in the idle() loop!  Do a ^Q at any of the "offending"
terminals would cause the system to come alive with no effects, other than
loss of time on the clock (verified by checking clock time before performing
tests).

As it turned out, somewhere along the way, I had turned off "UCB_CLIST".
When I defined it, the ^S problem went away.

	Kevin W. Thomas
	Univ. of Oklahoma
	School of Meteorology
	Norman, OK  73019

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