[issue1183] Interactive performance regression since 2.0 (patch #2)

[Matthew Dillon]

    I am seeing better cpu resource use too.  My buildworld -j 8 loop
    went from 2760 seconds to 2560 seconds, with chain_mplock set to 0.
    I am testeing with chain_mplock set to 1 right now.

BUILD 85 Thu Dec  4 10:56:02 PST 2008 -j 8
     2765.91 real      3316.81 user       472.50 sys

BUILD 14 Wed Dec 17 08:21:39 PST 2008 -j 8
     2570.78 real      3198.75 user       443.62 sys

    The commit is slated for Friday.  I am going to get the patch running
    on leaf and pkgbox today as well.

					-Matt
					Matthew Dillon 
					<dillon at backplane.com>