On Mar 24, 2006, at 4:17 PM, Michael W. Lucas wrote:
Running FreeBSD 6.1-PRERELEASE as a DNS, dhcp, and syslog server.
I'm having trouble with DNS, DHCP, and syslogd locking up, and I think
I've found what they all share in common.
During the lockups, the box starts dropping UDP due to full socket
buffers. I have a dumb little script to capture the rate of drops
over 5 seconds, and it's about 45 a second.
168725 dropped due to full socket buffers
168958 dropped due to full socket buffers
There is generally a cause behind the socket buffers filling up,
whether that is some form of livelock due to an OS problem or a
misconfiguration with a firewall/dummynet setup. You could look at
the output of "netstat -a(n)" for insight as to where the packets are
being queued up, but "netstat -s" would be useful to show to us as well.
--
-Chuck
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