#!/bin/bash # SPDX-License-Identifier: GPL-2.0 # # This test runs on Intel x86 based hardware which support the intel_pstate # driver. The test checks the frequency settings from the maximum turbo # state to the minimum supported frequency, in decrements of 100MHz. The # test runs the aperf.c program to put load on each processor. # # The results are displayed in a table which indicate the "Target" state, # or the requested frequency in MHz, the Actual frequency, as read from # /proc/cpuinfo, the difference between the Target and Actual frequencies, # and the value of MSR 0x199 (MSR_IA32_PERF_CTL) which indicates what # pstate the cpu is in, and the value of # /sys/devices/system/cpu/intel_pstate/max_perf_pct X maximum turbo state # # Notes: In some cases several frequency values may be placed in the # /tmp/result.X files. This is done on purpose in order to catch cases # where the pstate driver may not be working at all. There is the case # where, for example, several "similar" frequencies are in the file: # # #/tmp/result.3100:1:cpu MHz : 2899.980 #/tmp/result.3100:2:cpu MHz : 2900.000 #/tmp/result.3100:3:msr 0x199: 0x1e00 #/tmp/result.3100:4:max_perf_pct 94 # # and the test will error out in those cases. The result.X file can be checked # for consistency and modified to remove the extra MHz values. The result.X # files can be re-evaluated by setting EVALUATE_ONLY to 1 below.
EVALUATE_ONLY=0
# Kselftest framework requirement - SKIP code is 4.
ksft_skip=4
if ! uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ | grep -q x86; then echo"$0 # Skipped: Test can only run on x86 architectures."
exit $ksft_skip fi
msg="skip all tests:" if [ $UID != 0 ] && [ $EVALUATE_ONLY == 0 ]; then echo $msg please run this as root >&2
exit $ksft_skip fi
if ! command -v cpupower &> /dev/null; then echo $msg cpupower could not be found, please install it >&2
exit $ksft_skip fi
max_cpus=$(($(nproc)-1))
function run_test () {
file_ext=$1 for cpu in `seq 0 $max_cpus` do echo"launching aperf load on $cpu"
./aperf $cpu & done
[ $EVALUATE_ONLY -eq 0 ] && for freq in `seq $max_freq -100 $min_freq` do echo"Setting maximum frequency to $freq"
cpupower frequency-set -g powersave --max=${freq}MHz >& /dev/null
run_test $freq done
echo"========================================================================" echo"The marketing frequency of the cpu is $mkt_freq MHz" echo"The maximum frequency of the cpu is $max_freq MHz" echo"The minimum frequency of the cpu is $min_freq MHz"
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