git: tcp/sack: Optimize scoreboard block allocation

[Sepherosa Ziehau <sephe@xxxxxxxxxxxxxxxxxxxxxxx>]

commit 01d244e6599942128c17736a308b66ad33222926
Author: Sepherosa Ziehau <sephe@dragonflybsd.org>
Date:   Fri Apr 13 15:30:26 2012 +0800

    tcp/sack: Optimize scoreboard block allocation
    
    Allocate SACK scoreboard block only if we can't extend the existing
    one's right edge (end).
    
    This commit could avoid ~70% SACK scoreboard block allocation on
    leaf.dragonflybsd.org (11528032 updating, 8353353 reused) according
    to the "netstat -s -f inet -p tcp" output as of today.  On my testing
    sites, this commit could avoid 30%~50% SACK scoreboard block allocation.

Summary of changes:
 sys/netinet/tcp_sack.c |   85 ++++++++++++++++++++++++++++--------------------
 1 files changed, 50 insertions(+), 35 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/01d244e6599942128c17736a308b66ad33222926


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