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From: Lowell Gilbert <freebsd-questions-local@be-well.no-ip.com>
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Subject: Re: mbuf clusters exhausted
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Andreas Wider=F8e Andersen <awand@pragma.no> writes:

> What can I do to get rid of these problems?

I think you need to pay attention to the messages:

> All mbuf clusters exhausted, please see tuning(7).

You are hitting very large network buffer usage at some point during
the day -- much larger than your average use.  You need to allocate
more mbufs or figure out why you need so many resources at once.
Or, preferably, both.