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> 	But this is one of the places where you can really reduce your system CPU 
> consumption. What's the ratio of user CPU time to system CPU time on a 
> typical DALnet server these days? If system CPU time is 40% or more of what 
> user CPU time is, I'd focus on the parameters you pass to select/poll and 
> what steps you take to:

Undernet moved from poll() and select() to kqueue(), /dev/poll, and all
the rest.

To show the effect of this on a server, heres the CPU load of a server
that holds about 4k clients:

http://www.break.net/ircu10-to-11.png

On the left is kqueue(), on the right is select().

Almost all an IRC servers time it spent doing select()/poll() and the
associated housekeeping.

- -- 
Excellent day for putting Slinkies on an escalator.
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