Flashes (Alerts)
Abstract
The offline cores are activated as online cores when the SMT level is modified by using the ppc64_cpu --smt X command.
Content
Linux Releases Affected
Red Hat Enterprise Linux (RHEL) 9.4
IBM Systems Affected
IBM POWER9 and Power10 systems
Symptoms
To modify the SMT level, enter the following command:
ppc64_cpu --smt X
where X is the SMT level.
Check the CPU information of the system by using the lscpu command. You will notice that all the offline cores are activated as online cores after the SMT level is modified by using the ppc64_cpu command. This change in the behavior of the ppc64_cpu command is observed in RHEL 9.4.
Workaround
After the SMT level is modified by using the ppc64_cpu command, enter the following command to activate only a subset N number of cores online:
ppc64_cpu --cores-on N
Fix Outlook
Fix will be included in the upcoming Redhat releases.
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Document Information
Modified date:
30 May 2024
UID
ibm17154413