iptables performance and Dual CPU

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Hello...

I have tested iptables using bridge mode.
 
linux centos 3.x 
        kernel 2.6.x 
        Opteron dual CPU 
        2G RAM 
        conntrack enabled 

When I generating lots of of packets throught
iptables, 
one CPU upto 100% but the other CPU just idle..
and the performance degrades... 

As I know the performance of the iptables has
relations with CPU.
But, dual CPU can't help with iptables?
If I set dual bridge, can use dual CPU? 

Anyone who can provide me with some information 
about how to configure SMP system, 
so that both processors share the traffic load??


Thanks... 



 
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