Performance Problem Postmortem

David W. Hankins dhankins at
Mon Aug 17 23:14:49 UTC 2009

On Sat, Aug 15, 2009 at 06:19:14PM -0400, Robert Hille wrote:
> Aug  9 06:04:13 ns-dhcp-07 dhcpd: Unable to add forward map from [hostname] 
> to [IP]: timed out

DDNS timeouts pause the server for one second, so it couples your
performance to one DHCPREQUEST per second.  This is very likely the
source of your issues, I would suggest disabling ddns until the
issue can be fixed.

DISCOVER/OFFER may appear delayed, but this is the icmp-echorequest
feature ("ping-check"), and is performed asynchronously with handling
other DHCP packets.

David W. Hankins	"If you don't do it right the first time,
Software Engineer		     you'll just have to do it again."
Internet Systems Consortium, Inc.		-- Jack T. Hankins
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