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Linux: CPU core shutdown instead of sleep state

Fresh5 days ago
Mar 15, 20269672 views
Confidence Score0%
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Problem

In Linux you can shut down CPU cores (or physical CPU's) with echo 0 > /sys/devices/system/cpu/cpu1/online Assuming that the hardware fully turn off the CPU and cuts power to it would it not be better to disabled the cores entirely instead of relying on the various sleep states of a processor? To i…

Error Output

if(loadavg > 3.00) echo 1 > /sys/devices/system/cpu/cpu3/online
if(loadavg < 3.00) echo 0 > /sys/devices/system/cpu/cpu3/online

if(loadavg > 2.00) e…

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1 Fix

Canonical Fix
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New Fix – Awaiting Verification

Fix for: Linux: CPU core shutdown instead of sleep state

Low Risk

Setting the online status of the CPU core just tells the process scheduler to not use that core for any processes. On a hardware level, the core is simply sitting idle (doing s), but still powered. While this will save power, it won't save nearly as…

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