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sched_ule vs sched_4bsd - freebsd 8.1 performance puzzle

Posted by katmai 
ok guys i have something very puzzling:

i am using nginx-0.8.53/php-fpm-5.2.14/eaccelerator-0.9.6.1/
freebsd-8.1-latest-pl

i upgraded the system from freebsd7, and on my old freebsd7 system, i
was running SCHED_4BSD. the server worked rather ok, however, when i
switched to bsd 8.1, i decided to try sched_ule, and bummer, the
server load was shooting through the roof, the php-cgi processes were
almost constantly in RUN state, and basically the system was unusable
for heavy load.

i am talking about a dual xeons / 16 gb ram machine here.

anyway i recompiled the kernel, and got back to SCHED_4BSD, and the
system is not completely stable, but i would just want to know if
anyone has any experience and advice with this, and why the schedulers
performance difference.

cheers
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