MySQL needs at least Linux version 2.0.
We have seen some strange problems with Linux 2.2.14 and MySQL on SMP systems. Some MySQL users have also reported that they have encountered serious stability problems using MySQL with kernel 2.2.14. If you are using this kernel, you should upgrade to 2.2.19 (or newer) or to a 2.4 or 2.6 kernel. If you have a multiple-CPU machine, you should seriously consider using 2.4 or 2.6 because it gives you a significant speed boost. Your system should also be more stable.
When using LinuxThreads, you should see a minimum of three mysqld processes running. These are in fact threads. There is one thread for the LinuxThreads manager, one thread to handle connections, and one thread to handle alarms and signals.