[PATCH net-next 0/3] udp: reduce cache pressure

[Paolo Abeni <pabeni@redhat.com>]

In the most common use case, many skb fields are not used by recvmsg(), and
the few ones actually accessed lays on cold cachelines, which leads to several
cache miss per packet.

This patch series attempts to reduce such misses with different strategies:
* caching the interesting fields in the scratched space
* avoid accessing at all uninteresting fields
* prefetching

Tested using the udp_sink program by Jesper[1] as the receiver, an h/w l4 rx
hash on the ingress nic, so that the number of ingress nic rx queues hit by the
udp traffic could be controlled via ethtool -L.

The udp_sink program was bound to the first idle cpu, to get more
stable numbers.

On a single numa node receiver:

nic rx queues           vanilla                 patched kernel      delta
1                       1850 kpps               1850 kpps           0%
2                       2370 kpps               2700 kpps           13.9%
16                      2000 kpps               2220 kpps           11%

[1] https://github.com/netoptimizer/network-testing/blob/master/src/udp_sink.c

Paolo Abeni (3):
  net: factor out a helper to decrement the skb refcount
  udp: avoid a cache miss on dequeue
  udp: try to avoid 2 cache miss on dequeue

 include/linux/skbuff.h |  14 ++++++
 net/core/datagram.c    |   4 +-
 net/core/skbuff.c      |  32 ++++++++-----
 net/ipv4/udp.c         | 120 ++++++++++++++++++++++++++++++++++++++++++++-----
 4 files changed, 145 insertions(+), 25 deletions(-)

-- 
2.9.4