Optimizing pktgen for single CPU performance

This series focus on optimizing "pktgen" for single CPU performance.

V2-series:
- Removed some patches
- Doc real reason for TX ring buffer filling up

NIC tuning for pktgen:
http://netoptimizer.blogspot.dk/2014/06/pktgen-for-network-overload-testing.html

General overload setup according to:
http://netoptimizer.blogspot.dk/2014/04/basic-tuning-for-network-overload.html

Hardware:
System: CPU E5-2630
NIC: Intel ixgbe/82599 chip

Testing done with net-next git tree on top of
commit 6623b41944 ("Merge branch 'master' of...jkirsher/net-next")

Pktgen script exercising race condition:
https://github.com/netoptimizer/network-testing/blob/master/pktgen/unit_test01_race_add_rem_device_loop.sh

Tool for measuring LOCK overhead:
https://github.com/netoptimizer/network-testing/blob/master/src/overhead_cmpxchg.c

---

Jesper Dangaard Brouer (3):
pktgen: RCU-ify "if_list" to remove lock in next_to_run()
pktgen: avoid expensive set_current_state() call in loop
pktgen: document tuning for max NIC performance

 Documentation/networking/pktgen.txt |   28 +++++++++
 net/core/pktgen.c                   |  110 ++++++++++++++++++-----------------
 2 files changed, 83 insertions(+), 55 deletions(-)