[comp.unix.wizards] 4.3BSD DEC DMZ effective transfer rate lacking?

idallen@watcgl.waterloo.edu (08/11/88)

From: "Ian! D. Allen [CGL]" <idallen>

When I "cat file" through a DEC DMZ-32 port, I don't get the character rate
I thought I would get.  I get about 14000 bps when the port is set to
19200 bps and about 7200 bps when the port is set to 9600 bps.  The rates
through our DEC DMF-32 are almost identical to (indeed, slightly faster
than) the expected port bit rate, so I know our unloaded VAX 8600 running
4.3 BSD can keep up.

What is going on?  It is a known problem that these DEC DMZ devices don't
perform at their assigned rates?

chris@mimsy.UUCP (Chris Torek) (08/13/88)

In article <5473@watcgl.waterloo.edu> idallen@watcgl.waterloo.edu writes:
-... I get about 14000 bps when [a DMZ32] port is set to 19200 bps and
-about 7200 bps when the port is set to 9600 bps.  ... What is going on?
-It is a known problem that these DEC DMZ devices don't perform at their
-assigned rates?

Yes.
-- 
In-Real-Life: Chris Torek, Univ of MD Comp Sci Dept (+1 301 454 7163)
Domain:	chris@mimsy.umd.edu	Path:	uunet!mimsy!chris