RSS mode performance in ixgbe (82599) driver

[J.Hwan Kim]

Hi, everyone

I'm testing the RSS mode throughput of Intel ixgbe 82599 driver.
My server's specification is Xeon 3GHz (4cores) and PCIe speed is 
2.5Gx8lanes,
and DD2 memory is about 600~700MHz.

When I enable the RSS(receive side scaling) mode with 4 Rx queues,
the Rx performance is below than when I use a single queue.

I don't know how the cores operate, whether the cores run in sequence
or simultaneously at the same time.

I want to know the mechanism in general how the multi-cores run
and the reason why the performance of ixgbe driver in rss mode is below
non-rss mode.

Thanks in advance.

Best Regards,
J.Hwan Kim





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