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Date:      Mon, 03 Oct 2005 18:31:10 +0300
From:      Pertti Kosunen <pertti.kosunen@pp.nic.fi>
To:        "freebsd-current@freebsd.org" <freebsd-current@freebsd.org>,  net@freebsd.org
Subject:   send_query: No buffer space available
Message-ID:  <43414EBE.1060500@pp.nic.fi>

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What should i do to avoid these messages from MRTG and dhclient? This 
happens with some network load on xl0 interface and pf+altq or 
ipfw+dummynet+statefull rules enabled, even with simple pass rules.

Increasing kern.ipc.nmbclusters, kern.ipc.nsfbufs, kern.ipc.somaxconn 
and net.inet.tcp.sendspace doesn't seem to help. FreeBSD 5.3-RELEASE to 
6.0-BETA5 have this problem.

SNMP Error:
send_query: No buffer space available

dhclient: send_packet: No buffer space available

netstat -m
1108/572/1680 mbufs in use (current/cache/total)
975/351/1326/17216 mbuf clusters in use (current/cache/total/max)
0/12/4560 sfbufs in use (current/peak/max)
2227K/845K/3072K bytes allocated to network (current/cache/total)
0 requests for sfbufs denied
0 requests for sfbufs delayed
94 requests for I/O initiated by sendfile
766 calls to protocol drain routines



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