Performance issues after upgrade from SLES11 SP1 to SP2 or SP3
This document (7011982) is provided subject to the disclaimer at the end of this document.
SUSE Linux Enterprise Server 11 Service Pack 2
SUSE Linux Enterprise Server 11 SP3:
After updating to these package versions, available and used C-states can be shown with:
# cpupower idle-info
The desired C-State can be set with e.g.:
# cpupower idle-set -d 3
C-state no 3 gets disabled (not used by the kernel anymore) at runtime
# cpupower idle-set -e 3
will re-enable this state.
Two manpages have been added to the cpupower update as well which include more
cpupower-idle-info(1) and cpupower-idle-set(1)
SUSE Linux Enterprise Server 11 SP2:
Since SP2 is out of general support, no code fix is provided. Therefore the following boot/kernel parameter is a proper solution:
This might improve performance only when C-states for CPUs are disabled in the BIOS. If C states are enabled in the BIOS, you might still see performance issues. If that is the case, either disable them in the BIOS or additionally use the following kernel parameter:
This disables C-states on kernel level.
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- Document ID:7011982
- Creation Date: 19-Mar-2013
- Modified Date:10-Mar-2021
- SUSE Linux Enterprise Server
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