command to know OS kernel variant support?
 

I want to know what kernel varaints different distros of linux support. As of now, I am downloading OS and running:

rpm -qa kernel-*

to find out if it supports smp,PAE, xen or default kernel.
Is this right way to check?

What do you mean by "supports"? Do you mean what kernels a distro provides? If so that is distro specific and as such you'll more likely get a useful answer if you tell us what distro you are running.

Evo2.

I am running Open SUSE Enterprise Server 11 Service Pack 1 Release Candidate 3 64 Bit.