git: sockbuf: Pre-alloc sockbuf space, so asynchronized pru_send could be used.

[Sepherosa Ziehau <sephe@xxxxxxxxxxxxxxxxxxxxxxx>]

commit f786a6ac5c46366d76322e2580f68a8c21dcc07b
Author: Sepherosa Ziehau <sephe@dragonflybsd.org>
Date:   Sun Jan 22 21:29:29 2012 +0800

    sockbuf: Pre-alloc sockbuf space, so asynchronized pru_send could be used.
    
    When doing asynchronized pru_send, it is quite possible that we could
    break the send sockbuf's upper limit, if we only use ssb_space() to
    calculate the remaining sockbuf space.
    
    Now, we add another two counters into sockbuf, when we send a mbuf
    chain to the netisr, we update the these two counters to reflect how
    much mbufs will be pending on the send sockbuf.  When calculating the
    remaining space of the send sockbuf we also take these two counters
    into consideration, so we will not break the upper limit of the send
    sockbuf.  These two counter will also be updated when the mbufs in
    the sockbuf is to be dropped/freed.
    
    Reenable the asynchronized pru_send in sendfile and sosendtcp

Summary of changes:
 sys/kern/uipc_sockbuf.c  |   13 +++++++++++++
 sys/kern/uipc_socket.c   |    6 ++++--
 sys/kern/uipc_syscalls.c |   15 ++++++++++++---
 sys/netinet/tcp_input.c  |    2 +-
 sys/sys/sockbuf.h        |   31 +++++++++++++++++++++++++++++--
 sys/sys/socketvar.h      |   35 +++++++++++++++++++++++++++++++++++
 6 files changed, 94 insertions(+), 8 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/f786a6ac5c46366d76322e2580f68a8c21dcc07b


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