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#!/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 $ksft_skip fi max_cpus=$(($(nproc)-1)) function run_test () { file_ext=$1 for cpu in `seq 0 $max_cpus` do echo "launching aperf load on $cpu" ./aperf $cpu & done echo "sleeping for 5 seconds" sleep 5 grep MHz /proc/cpuinfo | sort -u > /tmp/result.freqs num_freqs=$(wc -l /tmp/result.freqs | awk ' { print $1 } ') if [ $num_freqs -ge 2 ]; then tail -n 1 /tmp/result.freqs > /tmp/result.$1 else cp /tmp/result.freqs /tmp/result.$1 fi ./msr 0 >> /tmp/result.$1 max_perf_pct=$(cat /sys/devices/system/cpu/intel_pstate/max_perf_pct) echo "max_perf_pct $max_perf_pct" >> /tmp/result.$1 for job in `jobs -p` do echo "waiting for job id $job" wait $job done } # # MAIN (ALL UNITS IN MHZ) # # Get the marketing frequency _mkt_freq=$(cat /proc/cpuinfo | grep -m 1 "model name" | awk '{print $NF}') _mkt_freq=$(echo $_mkt_freq | tr -d [:alpha:][:punct:]) mkt_freq=${_mkt_freq}0 # Get the ranges from cpupower _min_freq=$(cpupower frequency-info -l | tail -1 | awk ' { print $1 } ') min_freq=$(($_min_freq / 1000)) _max_freq=$(cpupower frequency-info -l | tail -1 | awk ' { print $2 } ') max_freq=$(($_max_freq / 1000)) [ $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 [ $EVALUATE_ONLY -eq 0 ] && cpupower frequency-set -g powersave --max=${max_freq}MHz >& /dev/null 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" # make a pretty table echo "Target Actual Difference MSR(0x199) max_perf_pct" | tr " " "\n" > /tmp/result.tab for freq in `seq $max_freq -100 $min_freq` do result_freq=$(cat /tmp/result.${freq} | grep "cpu MHz" | awk ' { print $4 } ' | awk -F "." ' { print $1 } ') msr=$(cat /tmp/result.${freq} | grep "msr" | awk ' { print $3 } ') max_perf_pct=$(cat /tmp/result.${freq} | grep "max_perf_pct" | awk ' { print $2 } ' ) cat >> /tmp/result.tab << EOF $freq $result_freq $((result_freq - freq)) $msr $((max_perf_pct * max_freq)) EOF done # print the table pr -aTt -5 < /tmp/result.tab exit 0
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