IOS IPS CPU Utilization

Hi,
I'm hoping that I can ask a question here about the IPS function built into the AdvSec versions of IOS?
I have experimented with implementing the default signature set on 3845's (12.4 mainline, 1GB dram) - and it works well; but the CPU utilization jumps from around 10% to ~30% - without any other changes.
Is this much of a jump to be expected? And, is there any "tuning" that can be done to bring it down significantly?
Thanks, Nick

Nick;
This is normal and can be tuned (i.e disable sigs for any protocols not in use). I would suggest using the 256MB signature definition file, as that is what I am using and it doesn't add much more overhead than builtin sigs. I have one 2811 in particular feeding 2 T1s w/ MLPPP and taking advantage of the Firewall & IPS features. These 2 features alone only added around 13% extra CPU utilization on this small box.

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     70                                                           
     60                                                           
     50                                                           
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     90                                                           
     80                                                           
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     20 ##########################################################
     10 ##########################################################
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     40 ######################################################################
     30 ######################################################################
     20 ######################################################################
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