Interactive performance regression since 2.0

[Matthew Dillon]

:Interactivity of desktop environment is significantly worse in current 
:master than it was in 2.0 due to scheduler changes:
:
:http://leaf.dragonflybsd.org/mailarchive/commits/2008-09/msg00094.html
:
:-- 
:Hasso Tepper

    Yes, I'm definitely seeing issues.

    If I do a 'while(1) end' in a csh then interactivity with e.g. Firefox
    goes to hell.  It isn't supposed to do that.  I think the
    non-interactive thread is interfering with the UI's heavily
    interactive operations between the X server and the application.

    I will try to track this down today.  I thought I had fixed this by
    allowing reschedules when the current user process  has a low dynamic
    priority but it doesn't seem to be working the way it is supposed to.

					-Matt
					Matthew Dillon 
					<dillon at backplane.com>