git: accept: Implement fast soaccept predication

[Sepherosa Ziehau]

commit 5e4b399478dd637a5a3939ddd2ebb4c5cffd3138
Author: Sepherosa Ziehau <sephe at dragonflybsd.org>
Date:   Thu Nov 24 13:53:54 2011 +0800

    accept: Implement fast soaccept predication
    
    Fast soaccept predication tries to run soaccept_predicate before
    domsg to the proto-thread, i.e. put the current thread into sleep.
    
    We could do this because listen socket's completion list is always
    protected by the listen socket's pool-token.  Domsg to proto-thread
    to extract socket from completion list for non-block listen socket
    does not make any sense.  Even for blocking listen socket if there
    are sockets on the completion list, domsg to the proto-thread to
    extract socket from completion list also wastes time.
    
    The result:
    
    192.168.249.42 (Xeon E3-1230 HT enabled, 16G) runs httperf
    192.168.249.29 (i7-2600 HT enabled, 16G) runs nginx (web server)
    
    The server runs nginx-1.0.4 (from pkgsrc-2011Q2), using the default
    configure w/ following changes:
    events {
        worker_connections  10240;
        use kqueue;
    }
    
    The client runs httperf-0.9.0 manually compiled w/ FD_SETSIZE to 16424
    The client machine runs following commands before starting benching:
    net.inet.ip.portrange.last=60000
    route change -net 192.168.249.0/24 -msl 500
    
    16 parallel httperf --server=192.168.249.29 --wsess=5000,1,1 --max-conn=4
    4 runs (Request rate, unit: req/s)
    
    old  23554.0  23542.0  23557.0  23526.2
    new  24793.7  24809.9  24792.7  24794.4
    
    This gives 5.3% performance improvement

Summary of changes:
 sys/kern/uipc_socket.c   |    4 ++++
 sys/kern/uipc_syscalls.c |   23 +++++++++++++++++++++++
 2 files changed, 27 insertions(+), 0 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/5e4b399478dd637a5a3939ddd2ebb4c5cffd3138


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