Will booting into kernel-smp on RHEL enable utilization of all cores?

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Issue

The server is running non-smp kernel version. The server is not utilizing the dual core processor. Will setting the grub.conf to use kernel-smp and rebooting correct the issue?
How to configure a server to use the SMP kernel?
Need to upgrade kernel from a single cpu to a newly added 2 processor configuration

Environment

Red Hat Enterprise Linux (RHEL) 3 and 4

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