Date: Fri, 24 Mar 2006 18:03:47 -0500 From: Charles Swiger <cswiger@mac.com> To: Michael W. Lucas <mwlucas@blackhelicopters.org> Cc: questions@freebsd.org Subject: Re: filling up UDP socket buffers like mad Message-ID: <83E0BC22-BFFA-47EE-88DA-D6A5D1862081@mac.com> In-Reply-To: <20060324211741.GA40819@bewilderbeast.blackhelicopters.org> References: <20060324211741.GA40819@bewilderbeast.blackhelicopters.org>
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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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