Path: utzoo!attcan!uunet!lll-winken!ncis.tis.llnl.gov!helios.ee.lbl.gov!pasteur!ucbvax!GATEWAY.MITRE.ORG!mankin
From: mankin@GATEWAY.MITRE.ORG
Newsgroups: comp.protocols.tcp-ip
Subject: Re: error "No Buffer Space"
Message-ID: <8905181213.AA08974@gateway.mitre.org>
Date: 18 May 89 12:13:55 GMT
References: <8905170310.AA19561@SCUBED.COM>
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 24

>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.

> netstat -m
>986/1248 mbufs in use:
>        65 mbufs allocated to data

>0 requests for memory denied

Tom,

The 65 mbufs allocated to data leads to a guess that your
MicroVax is running a DDN X.25 connection to a PSN net.
You should check whether your link to the PSN is running
and whether it's congested.  The message "No buffer space 
available" is a translation of the error number ENOBUFS.  
Besides covering cases of mbuf exhaustion, which as you say is
not the case here, ENOBUFS is returned through IP and TCP if the
network output queue overflows, which it may be doing because
the path is congested.

Allison