ipfw top packet processing rate

[justme2]

Hi,
are you aware of ipfw's performance processing packets on a 10Gbe link with 5Gb of traffic (or on a study/report about it) ?
The box has the following configuration:

- 2x Intel Xeon 5160 dual-core 3.00 GHz CPU (1333MHz FSB/4MB L2 cache)
- 4x 512 MB FB (Fully Buffered) DDR2/667 memory
- NIC Intel PRO/10Gbe

Thanks

Rob