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Date:      Tue, 25 May 1999 12:11:42 -0400 (EDT)
From:      korvus <korvus@tasam.com>
To:        freebsd-questions@freebsd.org
Subject:   mbuf cluster errors on freebsd 3.1
Message-ID:  <Pine.BSF.3.96.990525120740.29950A-100000@tasam.com>

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There is a problem on this one server where ocassionally it gets a "out of
mbuf clusters" error and then apache stops working until the server is
rebooted.  When the server was switched to SMP the problem became less
common, but raising the MaxClients in apache above 256 brings the problem
back consistantly.  In the kernel config, NMBCLUSTERS=4096 and here is the
output of netstat -m:
4856/5216 mbufs in use:
        3365 mbufs allocated to data
        1491 mbufs allocated to packet headers
3044/3250/4096 mbuf clusters in use (current/peak/max)
7152 Kbytes allocated to network (93% in use)
0 requests for memory denied
0 requests for memory delayed
0 calls to protocol drain routines

Does anyone know how to make more mbufs available or know how to reduce
the number of mbufs in use?  Thanks...

      - Jeff Poole 



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