svn commit: r249318 - in head/sys: kern net netinet

[Gleb Smirnoff]

On Tue, Apr 09, 2013 at 09:02:21PM +0000, Andre Oppermann wrote:
A> Author: andre
A> Date: Tue Apr  9 21:02:20 2013
A> New Revision: 249318
A> URL: http://svnweb.freebsd.org/changeset/base/249318
A> 
A> Log:
A>   Change certain heavily used network related mutexes and rwlocks to
A>   reside on their own cache line to prevent false sharing with other
A>   nearby structures, especially for those in the .bss segment.
A>   
A>   NB: Those mutexes and rwlocks with variables next to them that get
A>   changed on every invocation do not benefit from their own cache line.
A>   Actually it may be net negative because two cache misses would be
A>   incurred in those cases.

Although change is theoretically correct, IMO, such change should be
supported by experimental performance benchmarking data.

-- 
Totus tuus, Glebius.