Date: Fri, 28 Apr 2000 08:56:46 -0500 (CDT) From: Mark Tinguely <tinguely@plains.NoDak.edu> To: freebsd-questions@FreeBSD.ORG, olive@deep-ocean.net Subject: Re: looutput: mbuf allocation problem Message-ID: <200004281356.IAA03808@plains.NoDak.edu>
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you must see allocation failures when you execute the command:
$ netstat -m
With a MAXUSERS of 64, you should get 2560 NMBCLUSTERS (from the calculation
in sys/kern/uipc_mbuf.c). you can add more by the kernel option:
options NMBCLUSTERS=16384 # (or possibly 8192)
If you are just low of MBUF because of heavy traffic, this should do the
trick; if there is a MBUF leak in 4.0, then this will only postpone the
network hang.
I am surprised that the loopback output routine in FreeBSD 4.0 copies
every packet when only the KAME code (according to the comment) requires
the mbuf to be contiguous.
--mark tinguely.
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