git: kernel - IPI subset of cpus on token de-collision.

[Matthew Dillon <dillon@xxxxxxxxxxxxxxxxxxxxxxx>]

commit fc55f5f28066f85153e97f49617958e09d93276b
Author: Matthew Dillon <dillon@apollo.backplane.com>
Date:   Wed Dec 15 12:46:44 2010 -0800

    kernel - IPI subset of cpus on token de-collision.
    
    * Implement sysctl lwkt.token_ipi_dispatch and set the default value
      to 4, meaning when a token is released up to 4 conflicting cpus
      will be IPId to wake them up.
    
    * Saves 20-40W under load on the 48-core monster (out of ~450W
      or so).

Summary of changes:
 sys/kern/lwkt_token.c |   57 +++++++++++++++++++++++++++++++++++++++++++-----
 1 files changed, 51 insertions(+), 6 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/fc55f5f28066f85153e97f49617958e09d93276b


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