Path: utzoo!utgpu!water!watmath!clyde!rutgers!meccts!mn-at1!alan
From: alan@mn-at1.UUCP (Alan Klietz)
Newsgroups: comp.dcom.lans.hyperchannel
Subject: Re: > 4k Assoc. Data on A400?
Keywords: lans
Message-ID: <408@mn-at1.UUCP>
Date: 15 Jan 88 09:21:33 GMT
References: <590@ihnet.ATT.COM> <913@louie.udel.EDU> <116@amelia.nas.nasa.gov>
Reply-To: alan@mn-at1.UUCP (0000-Alan Klietz)
Distribution: comp.dcon.lans.hyperchannel
Organization: Roseville, MN
Lines: 35

In article <116@amelia.nas.nasa.gov> yamo@orville.nas.nasa.gov (Michael J. Yamasaki) writes:
<Greetings.  Ugly rumors aside, does anyone out there currently
<transmit and receive greater than 4k associated data on 
<A400 HYPERchannel Adapters (the minicomputer adapter)?
<
<Been trying to send large packets (about 60k associated data)
<via the A400 to A130s and A222s, but no cigar.  Various attempts
<have received various abort errors from the A400.
<
<Any help or pointers appreciated.
<
<Anybody at NSC listening?  Tech support hasn't been helpful.
<
<                        -Yamo-
<                   yamo@ames-nas.arpa

Hyperchannels used to be limited to a 4K data frame size, and
the device drivers reflected this.   Some A400 hosts simply do
not have the memory/interface capability (e.g. limited # of UBA
mapping registers on some VAXen).

The Suns here (3/260, IKON, A400) pump big data frames (16-64K+)
to Crays (A130) and IBMs (A222) on a regular basis.   The IKON
driver and the SunOs TCP/IP code were adjusted to handle the
larger MTU sizes.  Write for details.

--
Alan Klietz
Minnesota Supercomputer Center 
1200 Washington Avenue South
Minneapolis, MN  55415    UUCP:  ..rutgers!meccts!mn-at1!alan
Ph: +1 612 626 1836              ..ihnp4!dicome!mn-at1!alan (beware ihnp4)
                          ARPA:  alan@uc.msc.umn.edu  (was umn-rei-uc.arpa)

Vikes and Twins all the way!