# Question about sched\_ule and sched\_4bsd

**URL:** <https://www.ruby-forum.com/t/question-about-sched-ule-and-sched-4bsd/199426>\
**Category:** NGINX\
**Created:** [November 21, 2010, 12:41am UTC](https://www.ruby-forum.com/t/question-about-sched-ule-and-sched-4bsd/199426 "2010-11-21T00:41:21Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Dobai-Pataky\_BSSSSl](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/77aa72/32.png) [@Dobai-Pataky\_BSSSSl](https://www.ruby-forum.com/u/Dobai-Pataky_BSSSSl)\
**Post date:** [November 21, 2010, 12:41am UTC](https://www.ruby-forum.com/t/question-about-sched-ule-and-sched-4bsd/199426/1 "2010-11-21T00:41:21Z")

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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, but i would  
just want to know if anyone has any experience and advice with this, and  
why the schedulers performance difference.

cheers