CPU affinity in new ULE scheduler

Jon Brisbin jon.brisbin at npcinternational.com
Wed Nov 9 22:15:43 GMT 2005

I can't find any information on how to set the CPU affinity for processes in the 
FreeBSD 6 ULE scheduler.

On the linux box, which we're moving from, I have dual Xeon HTT's that I have 
JBoss scheduled round-robin with the CPU affinity set to the first two processors, 
nice -15. I have Postgres scheduled SCHED_FIFO on the last two processors, nice 
-15. This gives me the greatest bandwidth possible in our scenario as it eliminates 
the CPU contention I had noticed before doing it this way.

How do I do the same thing in FreeBSD? I have found a lot of information that talks 
about setting CPU affinity, but I have yet to find one example of how to do this. On 
linux, I'm using a CK-patched kernel and "schedtool" Is there something similar on 


Jon Brisbin
NPC International, Inc.

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