hutton@SCUBED.COM (Thomas Hutton) (05/17/89)
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)
netstat -m
986/1248 mbufs in use:
65 mbufs allocated to data
7 mbufs allocated to packet headers
57 mbufs allocated to socket structures
74 mbufs allocated to protocol control blocks
773 mbufs allocated to routing table entries
6 mbufs allocated to socket options
4 mbufs allocated to interface addresses
0/128 mapped pages in use
284 Kbytes allocated to network (43% in use)
0 requests for memory denied
adb /vmunix /dev/kmem
nbuf/D
_nbuf:
_nbuf: 818
Thanks,
Tom Hutton
hutton@scubed.commankin@GATEWAY.MITRE.ORG (05/18/89)
>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
minshall@kinetics.UUCP (Greg Minshall) (05/20/89)
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