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7. Restrictions and Precautions
7.1
Manual Onlining CPU being Core Offlined
Do not manually online the CPU that was core offlined.
When correctable error exceeds threshold value, Machine Check Monitoring Service offlines the failed
core.
The core offlined CPU cannot be used by OS.
You can online the core from OS (*), however, the offlined CPU is failing. Do not make online the failing
CPU.
* (Example) # echo 1 > /sys/devices/system/cpu/cpuX/online
7.2
cpuspeed Error Message Output at OS Shutdown
An error message of cpuspeed may be displayed when OS is shutdown. However, this does not affect
system operation.
When correctable error exceeds threshold value, the failed CPU core is offlined. If OS is shutdown after
CPU Core Offline, the message of cpuspeed is output.
This indicates that cpuspeed daemon failed to execute end processing to core offlined CPU. It does not
affect system operation if cpuspeed end processing was not executed to offlined CPU. You can ignore
this message.
See 6.1.4 Other on-screen messages for details of error message.
