How do I set a server to one core ?

[Enemy1]

Im running a dualcore xeon server and have noticed that this have unstable fps.
My old server with singelP4 core is 99% stable, and I would like to try to set the xeon servers to a spec. core ..
How do I do that .. I know I have seen it somewere but I cant find it ..

[fqdn]

use taskset

[Enemy1]

Thanks !
I have 2 servers running on this dualxeon and I hope that it will be more stable in fps now