network: add test for low latency busy poll

The test measures the performance of TCP client/server
with and without busy poll feature, then it compares results.

Enabling of busy poll is done globally via sysctl knobs,
values are set to recommended ones (according to Linux docs).

The feature was added in Linux 3.11.

Signed-off-by: Alexey Kodanev <alexey.kodanev@oracle.com>
3 files changed