Aucbarpa.124
NET.unix-wizards
utzoo!decvax!ucbvax!arpavax:wnj
Thu Aug 27 18:05:44 1981
performance of async interfaces
the able dmax works just fine.
others are too new for final word on them, although many have had problems
with early cs11s; emulex has fixed most of these problems.

on vax, we see following overheads for output at 9600 baud with reasonably
long lines (i.e. not all characters require special processing):
	dz-11	5%
	dh-11	3%
this of a 11/780 processor.  the dz-11 uses pseudo-dma.  on 32/v pre
pseudo-dma one 9600 baud line was > 100%, i.e. you couldn't drive one
line at full 9600.

	bill joy

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