[c-nsp] Will the Cisco 2911 push GigE with NAT enabled ?

[Dave]

Good morning list,

I apologize for what is a long winded explanation followed by what may 
be a 'common knowledge' type of question, but I did try google first to 
find this information and either I'm not using the correct search terms 
or I am truly missing something. I throw myself on the mercy of the list 
and humbly request the assistance of those with more experience than 
myself.

We have a Cisco 2911 ISR with a 1Gig connection to our remote site and I 
am completely unable to get more than 100Mbps across this router. The 
closer I get to 100Mbps the higher the CPU load goes due to interrupts. 
We are running NAT and I have followed the troubleshooting proceedures 
from cisco regarding high cpu utilization due to interrupts.

No interfaces have any access lists longer than 10 entries. I also tried 
both with and without NetFlow switching enabled.

CEF is showing enabled and running on all interfaces, however I am 
seeing a large number of packets that are process switched. ( I assume 
due to NAT Translation)

show alignment says that no alignment data has been recorded and no 
spurious memory references have been recorded.

We have no voice ports or ATM interfaces

currently running IOS 15.1(4)M3

recently upgraded the memory on the router with a 2Gig stick.

I'm at a complete loss as to what is happening unless this router is 
simply not capable of doing full gigE. I will happily provide output of 
any diagnostic commands if needed. Can someone even tell me if this 
rotuer is actually capable of hitting GigE speeds ?

Thank you

Dave