I am assuming this was the one that was installed via "yum --enablerepo centosplus install kernel". However now I have lost my smp support :(. On this system I have two processors and I run them hyperthreaded. How can I enable smp support in this kernel?
Apparently I missed the whole smp kernel thing earlier. "yum --enablerepo centosplus install kernel-smp" will provide smp support. I'd recommend reading through the yum docs. You can do some very interesting things, for example "yum --enablerepo centosplus list kernel* " will show all available kernel packages. If you want a full list of what's available you can do yum --enablerepo centosplus list > rpmlist and it will give you a list of all available packages in a file called rpmlist. Once you know the basics you can get very creative.