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Date: Mon, 11 Apr 2011 00:06:36 +0700
From: Eugene Grosbein <egrosbein@rdtc.ru>
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To: Przemyslaw Frasunek <przemyslaw@frasunek.com>
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Cc: freebsd-net@freebsd.org
Subject: Re: mpd5/Netgraph issues after upgrading to 7.4
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On 10.04.2011 16:00, Przemyslaw Frasunek wrote:
> Eventually I found that this issue is related to mbuf exhaustion. In
> periods when sendto() fails with EPERM, the "requests for mbufs denied"
> counter is increasing and "ngctl list" also fails.
> 

Use command "vmstat -z|egrep 'ITEM|NetGraph'" and check FAILURES column.
If you see non-zero values there, you need to increase netgraph memory limits
net.graph.maxdata and net.graph.maxalloc using /boot/loader.conf.

I use:

net.graph.maxdata=65536
net.graph.maxalloc=65536

Eugene Grosbein