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From: rex@cs.su.oz (Rex Di Bona)
Newsgroups: comp.sys.mips
Subject: 4.52 is it reliable?
Message-ID: <2338@cluster.cs.su.oz.au>
Date: 24 Apr 91 07:04:44 GMT
Sender: news@cluster.cs.su.oz.au
Reply-To: rex@cluster.cs.su.oz (Rex Di Bona)
Organization: Basser Dept of Computer Science, University of Sydney, Australia
Lines: 35

We have just installed the 4.52 kernel on our M120's and 3240 to try and reduce
the frequency of crashes.

The symptoms we are/were having are:
	1) The machine runs out of mbufs.
	2) The machine panics and then takes a monitor exception
		Or.. it panics with 'clget: null client'
		Or.. the machine hangs the silent death
	3) The machine double panics or fails to talk to the fuji scsi
		controller resulting in no kernel core dump...

The load on the machines is usually 2.5+ in the run queue, the machines
are swapping, but not really heavily.

The result... well, we used to have two crashes or so a day, now we only
have one (per machine :-)

Is this a known problem? The 4.52 release notes said a mbuf leak was fixed,
but there may still be another :-)

The configuration is:
	4 machines (3 by M120, 1 by 3240) each with...
	20+ users, all on ncd-19 X terminals, 48MB of memory
	about 200 procs, 1100 inodes, 600 files, 100+ process switches and
	5000+ system calls a sec. 60 or so ethernet packets a second doing
	X traffic. (running 4.51, then 4.51 upgraded with 4.52 kernels)

We have tried increasing the number of mbufs, but the machines still
eventually crash.

Any suggestions? Fixes?
P.s. we have 3230's with similar loads which have been running fine for weeks.
--------
Rex di Bona (rex@cs.su.oz.au)
Penguin Lust is NOT immoral