RHEL Kernel - EL or ELsmp?

EL use for Single CPU, old (PI, PII, Celeron). The kernel type is called ‘non-SMP kernel’.

ELsmp use for Multi core processor(dual core) or HT(HyperThreding). SMP is common from Symmetric multiprocessing

EL or ELsmp? I don't know. Check your CPU! just that!

More Resource
Linux SMP Howto
Linux Parallel Processing Using SMP
Linux and symmetric multiprocessing