in linux , we can make Fet work with 1 or 2 or all process.
eample:
taskset 0x00000001 fet
let fet work with the first processors only.
taskset 0x00000003 fet
let fet work with 2 processors only.
taskset 0xFFFFFFFF fet
let fet work with all processors.
for more option : welcome (http://linux.die.net/man/1/taskset)
Yes, you can do that, but the effect will be currently (at "standard" computers) pretty tiny.