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Date: Mon, 11 Apr 2011 11:19:41 +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 11.04.2011 05:34, Przemyslaw Frasunek wrote:
>> 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.
> 
> Unfortunately, increasing net.graph.maxdata & net.graph.maxalloc didn't
> solved EPERM problems on netgraph control sockets. It is still appearing
> every few hours, but failure counters are zero:
> 
> ITEM                     SIZE     LIMIT      USED      FREE  REQUESTS
> FAILURES
> NetGraph items:            36,    65598,        0,     1404,    52978,
>       0
> NetGraph data items:       36,    65598,        0,      780,  2876420,
>       0
> 
> I also tried to increase kern.ipc.nmbclusters to 262140, but after that,
> mpd stopped accepting any connections - each failed with ENOBUFS.
> 
> What is the upper limit of kernel memory usage?

It depends on your FreeBSD version (arch is significant too)
and physical RAM size.

Eugene Grosbein