git: udp: Support asynchronized pru_send for connected socket

[Sepherosa Ziehau <sephe@xxxxxxxxxxxxxxxxxxxxxxx>]

commit 6ce03112e52be1800f0f88b20a00ca5cef474322
Author: Sepherosa Ziehau <sephe@dragonflybsd.org>
Date:   Sun Dec 4 18:43:40 2011 +0800

    udp: Support asynchronized pru_send for connected socket
    
    The result:
    
    192.168.3.1 PhenomII 970 (runs netperf, hw 82571EB)
    192.168.3.2 Phenom 9550 (runs netserver, hw 82574L)
    
    netperf -H 192.168.3.2 -t UDP_STREAM -P0 -l 30 -- -n -m 18
    (10 second `netstat -nI emx0 -w 1`, unit: pps)
    
      old      new
    204736   1225536
    203712   1224960
    203520   1224640
    202880   1228416
    203392   1225408
    203648   1224960
    203456   1219968
    203648   1224064
    203712   1218880
    204224   1222464
    
    This gives ~600% tiny UDP packet TX performance improvement.
    
    The the current tiny UDP packet TX rate (1.22Mpps) is quite near
    the 1.48Mpps 1000baseT limitation.

Summary of changes:
 sys/kern/uipc_socket.c   |   13 ++++++++++++-
 sys/netinet/in_proto.c   |    2 +-
 sys/netinet/udp_usrreq.c |    8 +++++++-
 3 files changed, 20 insertions(+), 3 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/6ce03112e52be1800f0f88b20a00ca5cef474322


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