DHCP server answers with delay

Simon Hobson dhcp1 at thehobsons.co.uk
Thu Apr 3 10:47:45 UTC 2014

Denis Taranushin <tda at suttk.ru> wrote:

> We have trouble with DHCP. namely the DHCP server answers with delay.

> Why the server answers in 4 secs after the first "Discover"?

> Unfortunately I can't provide the config because it is enormous.

Has it occurred to you that the two may be related ? Is this a new problem, or has it always been like that ? If it's new, has anything changed ? How much memory is the DHCP process taking ? Does the host have enough ? Is it swapping ? What is disk I/O like ?
How many clients are being served ? Is DNS updating in use ?

Can you provide a shortened form of the config ? Eg, if you have a gazzillion class definitions, just provide a couple and note how many there are. There are some things you can do in the config which are "expensive" in resource usage or time, but without seeing it, no-one here can comment.

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