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annulen/HOWTO disable hyper-threading

Last active October 1, 2020 11:48
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How to disable hyper-threading with only SSH access
Raw
cpu_topology.sh
#!/bin/sh
cat /sys/devices/system/cpu/cpu*/topology/thread_siblings_list
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disable-ht.sh
#!/bin/sh
echo 0 > /sys/devices/system/cpu/cpu4/online
echo 0 > /sys/devices/system/cpu/cpu5/online
echo 0 > /sys/devices/system/cpu/cpu6/online
echo 0 > /sys/devices/system/cpu/cpu7/online
Raw
enable-ht.sh
#!/bin/sh
echo 1 > /sys/devices/system/cpu/cpu4/online
echo 1 > /sys/devices/system/cpu/cpu5/online
echo 1 > /sys/devices/system/cpu/cpu6/online
echo 1 > /sys/devices/system/cpu/cpu7/online
Raw
HOWTO disable hyper-threading
Note that it's probably a bad idea to do this; I've resorted to this evil because of suspicion about CPU being defective or physically damaged.
./cpu_topology.sh - lists what virtual cores correspond to the same physical core
You need to adjust other scripts according to ./cpu_topology.sh results, they are given for typical 4 cores with HT case
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