run.sh

  1#!/bin/bash
  2# SPDX-License-Identifier: GPL-2.0
  3#
  4# This test runs on Intel x86 based hardware which support the intel_pstate
  5# driver.  The test checks the frequency settings from the maximum turbo
  6# state to the minimum supported frequency, in decrements of 100MHz.  The
  7# test runs the aperf.c program to put load on each processor.
  8#
  9# The results are displayed in a table which indicate the "Target" state,
 10# or the requested frequency in MHz, the Actual frequency, as read from
 11# /proc/cpuinfo, the difference between the Target and Actual frequencies,
 12# and the value of MSR 0x199 (MSR_IA32_PERF_CTL) which indicates what
 13# pstate the cpu is in, and the value of
 14# /sys/devices/system/cpu/intel_pstate/max_perf_pct X maximum turbo state
 15#
 16# Notes: In some cases several frequency values may be placed in the
 17# /tmp/result.X files.  This is done on purpose in order to catch cases
 18# where the pstate driver may not be working at all.  There is the case
 19# where, for example, several "similar" frequencies are in the file:
 20#
 21#
 22#/tmp/result.3100:1:cpu MHz              : 2899.980
 23#/tmp/result.3100:2:cpu MHz              : 2900.000
 24#/tmp/result.3100:3:msr 0x199: 0x1e00
 25#/tmp/result.3100:4:max_perf_pct 94
 26#
 27# and the test will error out in those cases.  The result.X file can be checked
 28# for consistency and modified to remove the extra MHz values.  The result.X
 29# files can be re-evaluated by setting EVALUATE_ONLY to 1 below.
 30
 31EVALUATE_ONLY=0
 32
 33# Kselftest framework requirement - SKIP code is 4.
 34ksft_skip=4
 35
 36if ! uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ | grep -q x86; then
 37	echo "$0 # Skipped: Test can only run on x86 architectures."
 38	exit $ksft_skip
 39fi
 40
 41msg="skip all tests:"
 42if [ $UID != 0 ] && [ $EVALUATE_ONLY == 0 ]; then
 43    echo $msg please run this as root >&2
 44    exit $ksft_skip
 45fi
 46
 47if ! command -v cpupower &> /dev/null; then
 48	echo $msg cpupower could not be found, please install it >&2
 49	exit $ksft_skip
 50fi
 51
 52max_cpus=$(($(nproc)-1))
 53
 54function run_test () {
 55
 56	file_ext=$1
 57	for cpu in `seq 0 $max_cpus`
 58	do
 59		echo "launching aperf load on $cpu"
 60		./aperf $cpu &
 61	done
 62
 63	echo "sleeping for 5 seconds"
 64	sleep 5
 65	grep MHz /proc/cpuinfo | sort -u > /tmp/result.freqs
 66	num_freqs=$(wc -l /tmp/result.freqs | awk ' { print $1 } ')
 67	if [ $num_freqs -ge 2 ]; then
 68		tail -n 1 /tmp/result.freqs > /tmp/result.$1
 69	else
 70		cp /tmp/result.freqs /tmp/result.$1
 71	fi
 72	./msr 0 >> /tmp/result.$1
 73
 74	max_perf_pct=$(cat /sys/devices/system/cpu/intel_pstate/max_perf_pct)
 75	echo "max_perf_pct $max_perf_pct" >> /tmp/result.$1
 76
 77	for job in `jobs -p`
 78	do
 79		echo "waiting for job id $job"
 80		wait $job
 81	done
 82}
 83
 84#
 85# MAIN (ALL UNITS IN MHZ)
 86#
 87
 88# Get the marketing frequency
 89_mkt_freq=$(cat /proc/cpuinfo | grep -m 1 "model name" | awk '{print $NF}')
 90_mkt_freq=$(echo $_mkt_freq | tr -d [:alpha:][:punct:])
 91mkt_freq=${_mkt_freq}0
 92
 93# Get the ranges from cpupower
 94_min_freq=$(cpupower frequency-info -l | tail -1 | awk ' { print $1 } ')
 95min_freq=$((_min_freq / 1000))
 96_max_freq=$(cpupower frequency-info -l | tail -1 | awk ' { print $2 } ')
 97max_freq=$((_max_freq / 1000))
 98
 99
100[ $EVALUATE_ONLY -eq 0 ] && for freq in `seq $max_freq -100 $min_freq`
101do
102	echo "Setting maximum frequency to $freq"
103	cpupower frequency-set -g powersave --max=${freq}MHz >& /dev/null
104	run_test $freq
105done
106
107[ $EVALUATE_ONLY -eq 0 ] && cpupower frequency-set -g powersave --max=${max_freq}MHz >& /dev/null
108
109echo "========================================================================"
110echo "The marketing frequency of the cpu is $mkt_freq MHz"
111echo "The maximum frequency of the cpu is $max_freq MHz"
112echo "The minimum frequency of the cpu is $min_freq MHz"
113
114# make a pretty table
115echo "Target Actual Difference MSR(0x199) max_perf_pct" | tr " " "\n" > /tmp/result.tab
116for freq in `seq $max_freq -100 $min_freq`
117do
118	result_freq=$(cat /tmp/result.${freq} | grep "cpu MHz" | awk ' { print $4 } ' | awk -F "." ' { print $1 } ')
119	msr=$(cat /tmp/result.${freq} | grep "msr" | awk ' { print $3 } ')
120	max_perf_pct=$(cat /tmp/result.${freq} | grep "max_perf_pct" | awk ' { print $2 } ' )
121	cat >> /tmp/result.tab << EOF
122$freq
123$result_freq
124$((result_freq - freq))
125$msr
126$((max_perf_pct * max_freq))
127EOF
128done
129
130# print the table
131pr -aTt -5 < /tmp/result.tab
132
133exit 0