Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!gatech!ukma!rex!ames!apple!voder!nsc!csi!varian!kinetics!minshall
From: minshall@kinetics.UUCP (Greg Minshall)
Newsgroups: comp.protocols.tcp-ip
Subject: Re: error "No Buffer Space"
Message-ID: <755@kinetics.UUCP>
Date: 19 May 89 23:24:25 GMT
References: <8905170310.AA19561@SCUBED.COM>
Organization: Kinetics, Inc., Walnut Creek, CA
Lines: 21

From article <8905170310.AA19561@SCUBED.COM>, by hutton@SCUBED.COM (Thomas Hutton):
> 
> In attempting to use a microvax running ultrix 2.X as a gateway into the 
> internet, I have recently been getting lots of "No buffer space available"
> messages.  At first I thought I was running out of mbuf's but this dosent
> seem to be the case.  Does anyone know what I can bump in this ultrix version
> to improve this case.  (It recently got worse once we started using LAT
> to this system)

Possibly (probably?) you are running out of buffers in your output queue
for one of your network interfaces.  This is the famous field
ifp->if_snd.ifq_maxlen, which defines how many packets may be on an
interface at a time.  You should look in if_de.c, or whatever interface
there is.  There is at least one variant of netstat (with the "-i" flag)
which shows the current (and maximum) queue length, as well as adb macros
(in /usr/lib/adb?) which will show that information.

Hope this helps.

Greg Minshall				Kinetics, a division of Excelan
...!ucbvax!unisoft!kinetics!minshall	1-415-947-0998