CPU usage in connection concentrator

I'm using the connection concentrator with db2 v8.2 on AIX 52 with
this configuration:

max_connections = 4000
maxagents = max_coordagents = num_poolagents = 600
num_initagents = 100
maxcagents = max_coordagents
intra_parallel = yes, but default degree is 1

the average number of applications connected to the database is about
1500. these applications do very short transactions and many file transfer
so
that most of the time they are decoupled.

the only problem I noticed is that the 3 db2disp processes allocates use
more or less one cpu each... Power4+ 1.1 Ghz (regatta, p690).

another info is the number of "agent stolen from other applications" that is
about 150~200 per second.

is there any doc or suggestion I can use to understand how to limit the CPU
usage,
or a better configuration?

thanks in advance,
marco
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Marco Negri, I.NET s.p.a +39 02 32863 ext 1