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- Path: sparky!uunet!zephyr.ens.tek.com!psgrain!ee.und.ac.za!ucthpx!hippo!nuustak!csir.co.za!frcs!chris
- From: chris@frcs.Alt.ZA (Chris Old)
- Newsgroups: comp.protocols.tcp-ip
- Subject: ka9q router unstable under heavy load
- Message-ID: <1992Sep3.162715.9190@frcs.Alt.ZA>
- Date: 3 Sep 92 16:27:15 GMT
- Organization: Free Range Computer Systems CC
- Lines: 32
-
- We have a mini internet, with four ka9q routers on the main ethernet
- backbone, connecting remote sites via slip. The version of ka9q has a
- version number of 911229 (7 months ago). All we did to it was undef the
- various hardware and software options that we didn't need in config.h.
- Otherwise it is stock standard.
-
- The slip lines run over 9600 async lines (well actually sync, but we have
- async to sync converters) and the serial ports are fitted with 164550's.
- We used to have 16550's, but we changed them to see if that fixed the
- problem described below.
-
- Now two of the routers connect sites with very little load, and are very
- stable. The other two routers hang on average 3 times a day. By hang I
- mean that they don't answer pings on the local ethernet, and on the rare
- occasions that they have keyboard and screen plugged in, the keyboard is
- dead.
-
- The loaded routers have ~8 telnet sessions being routed through each
- router, onto the ethernet. The telnet sessions are running a menu driven
- piece of software on a unix machine, and so have to carry a lot of data
- (redrawn screens etc.).
-
- At one stage I doubled the MTHRESH, NIBUFS, IBUFSIZE and DEFNSOCK in
- config.h, but this made no difference.
-
- There is no hardware or software difference between the routers that
- crash and those that don't, except hostname and ip addr in autoexec.net.
- We used to use 286s, but now they are 386s and this makes no difference.
-
- Any clues anyone?
-
- chris
-