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Although the controller on the Intel(R) PRO/1000 PT Server Adapter does support RSS, the feature was never implemented in the Linux driver. Although the controller supports 2 queues, the controller does not support MSI-x, which would give you multiple receive interrupts, 1 for each queue. You can only find Linux drivers with RSS support for adapters based on newer controllers such as the 82575, 82576, and 82580.
You might have some relief on the way. One of our Linux gurus told me this:
In upcoming kernels from kernel.org (currently in Linux-next kernel and davem's net-next tree), there will be support for "software RSS" from some patches from Tom Herbert at Google. The patches contain the code for "RPS - Receive Packet Steering" and "RFS - Receive Flow Steering" and allow a single queue device to use multiple CPUs to process traffic.