apei - SLES11SP1/RHEL6beta backports for ACPI4 error injection and 
       corrected memory error logging for Nehalem-EX systems. These are i
       separate modules that can be used without patching the kernel.
       Needs BIOS support.

pfa  - An older approach to provide corrected memory error logging on
       Nehalem-EX systems. Also needs BIOS support and requires kernel
       patching. In most cases the apei module above is preferable.

dmcrypt-scale - dmcrypt encryption for SLES11SP1 (or other 2.6.32 based
       kernels like RHEL6beta) that scales to multiple CPUs.