CPU usage for 10Gbps UDP transfers

Hello,

is it expected that application sending 8900bytes datagram through 10Gbps NIC
utilizes CPU to 100% and similarly the receiver also utilizes CPU to 100%.
Is it something wrong or this is quite OK?

(The box is dual single core Opteron 2.4GHz with Myricom 10GE NIC.)

-- 
Lukáš Hejtmánek
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