Disable efficiency cores

Also clarified the package/socket as package is more correct but socket is better known and fixed a typo.

Author: vmcj

provision-contest/disable-turboboost_ht

@@ -5,6 +5,14 @@ shopt -s extglob
 
 declare -A core_ids
 
+# Learn all efficency cores if they exist
+cpu_list=()
+if [ -f /sys/devices/cpu_atom/cpus ]; then
+  range="$(cat /sys/devices/cpu_atom/cpus)"
+  IFS='-' read -r start end <<< "$range"
+  cpu_list=($(eval echo {$start..$end}))
+fi
+
 # shellcheck disable=SC2012
 for cpu in $(ls -1d /sys/devices/system/cpu/cpu* | sort --version-sort) ; do
     [[ $(basename $cpu) =~ ^cpu[0-9]+$ ]] || continue
@@ -32,14 +40,28 @@ for cpu in $(ls -1d /sys/devices/system/cpu/cpu* | sort --version-sort) ; do
         chmod a-w $cpu/cpufreq/scaling_{max,min}_freq
     fi
 
-    # Disable all but one thread on each core. Both core_id and physical_package_id are
-    # numbers it must be ensured that for the following examples are seen as distinct:
+    # Disable all but one thread on each core per socket. Both core_id and physical_package_id
+    # are numbers so it must be ensured that for the following examples are seen as distinct:
     #  - core_id=1,  physical_package=11
-    #  - core_id=11, physycal_package=1
+    #  - core_id=11, physical_package=1
     # Simple concatenation would result in the string '111' for both cores. Though `cat`
     # adds a newline after each file, we do not want to rely on `cat` to always add this
     # 'delimiter'.
     core_id=$(cat $cpu/topology/core_id | tr -d '\n')'-'$(cat $cpu/topology/physical_package_id | tr -d '\n')
+
+    # Disable all efficiency cores
+    found=0
+    for efficiency_core in "${cpu_list[@]}"; do
+      if [[ "$cpu" == "/sys/devices/system/cpu/cpu$efficiency_core" ]]; then
+        echo 0 > $cpu/online
+        found=1
+        break
+      fi
+    done
+    if [ "$found" -eq "1" ]; then
+      continue
+    fi
+
     if [[ ${core_ids[$core_id]:-} ]]; then
         echo 0 > $cpu/online
     else