SMP stands for Symmetric Multi-Processors, it is a computer system that can complete separated course (multiprocessing) thought multi-CPUs to improve the speed of computer.

If the installation program checks out that there are more than one CPU in you computer, it will establish two boot loading program options automatically.

There have two GRUB boot options in /etc/grub.conf file here: Asianux and Asianux-up. Asianux (SMP kernel) will be booted by default. If meet with difficulty when using SMP kernel, it can also select to boot Asianux-up (single CPU kernel).

Intel® Pentium® 4 system that has hyper thread will install SMP kernel by default.