drigby@??? said:
> I'm thinking of setting up a caching-only DNS server on my mail
> server, to try and speed up Exim. Has anyone else tried it, and is the
> performance increase (if any) worth the effort ?
Unhelpfully... it depends!
If you have a nearby (ie direct ethernet connected DNS server with
sufficient resources) DNS server then its unlikely to make much
difference and could possibly be slower to use a same machine server
due to context switches.
DNS servers need memory. If a local server would be pushed into swap
then thats seriously bad.
In theory a local ncsd or similar cache could be good. In practice
they are evil and should be destroyed immediately :-)
Nigel.
--
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[ Nigel Metheringham Nigel.Metheringham@??? ]
[ Phone: +44 1423 850000 Fax +44 1423 858866 ]
