1#!/bin/bash
2#
3# This test runs on Intel x86 based hardware which support the intel_pstate
4# driver.  The test checks the frequency settings from the maximum turbo
5# state to the minimum supported frequency, in decrements of 100MHz.  The
6# test runs the aperf.c program to put load on each processor.
7#
8# The results are displayed in a table which indicate the "Target" state,
9# or the requested frequency in MHz, the Actual frequency, as read from
10# /proc/cpuinfo, the difference between the Target and Actual frequencies,
11# and the value of MSR 0x199 (MSR_IA32_PERF_CTL) which indicates what
12# pstate the cpu is in, and the value of
13# /sys/devices/system/cpu/intel_pstate/max_perf_pct X maximum turbo state
14#
15# Notes: In some cases several frequency values may be placed in the
16# /tmp/result.X files.  This is done on purpose in order to catch cases
17# where the pstate driver may not be working at all.  There is the case
18# where, for example, several "similar" frequencies are in the file:
19#
20#
21#/tmp/result.3100:1:cpu MHz              : 2899.980
22#/tmp/result.3100:2:cpu MHz              : 2900.000
23#/tmp/result.3100:3:msr 0x199: 0x1e00
24#/tmp/result.3100:4:max_perf_pct 94
25#
26# and the test will error out in those cases.  The result.X file can be checked
27# for consistency and modified to remove the extra MHz values.  The result.X
28# files can be re-evaluated by setting EVALUATE_ONLY to 1 below.
29
30EVALUATE_ONLY=0
31
32max_cpus=$(($(nproc)-1))
33
34# compile programs
35gcc aperf.c -Wall -D_GNU_SOURCE -o aperf  -lm
36[ $? -ne 0 ] && echo "Problem compiling aperf.c." && exit 1
37gcc -o msr msr.c -lm
38[ $? -ne 0 ] && echo "Problem compiling msr.c." && exit 1
39
40function run_test () {
41
42	file_ext=$1
43	for cpu in `seq 0 $max_cpus`
44	do
45		echo "launching aperf load on $cpu"
46		./aperf $cpu &
47	done
48
49	echo "sleeping for 5 seconds"
50	sleep 5
51	num_freqs=$(cat /proc/cpuinfo | grep MHz | sort -u | wc -l)
52	if [ $num_freqs -le 2 ]; then
53		cat /proc/cpuinfo | grep MHz | sort -u | tail -1 > /tmp/result.$1
54	else
55		cat /proc/cpuinfo | grep MHz | sort -u > /tmp/result.$1
56	fi
57	./msr 0 >> /tmp/result.$1
58
59	max_perf_pct=$(cat /sys/devices/system/cpu/intel_pstate/max_perf_pct)
60	echo "max_perf_pct $max_perf_pct" >> /tmp/result.$1
61
62	for job in `jobs -p`
63	do
64		echo "waiting for job id $job"
65		wait $job
66	done
67}
68
69#
70# MAIN (ALL UNITS IN MHZ)
71#
72
73# Get the marketing frequency
74_mkt_freq=$(cat /proc/cpuinfo | grep -m 1 "model name" | awk '{print $NF}')
75_mkt_freq=$(echo $_mkt_freq | tr -d [:alpha:][:punct:])
76mkt_freq=${_mkt_freq}0
77
78# Get the ranges from cpupower
79_min_freq=$(cpupower frequency-info -l | tail -1 | awk ' { print $1 } ')
80min_freq=$(($_min_freq / 1000))
81_max_freq=$(cpupower frequency-info -l | tail -1 | awk ' { print $2 } ')
82max_freq=$(($_max_freq / 1000))
83
84
85for freq in `seq $max_freq -100 $min_freq`
86do
87	echo "Setting maximum frequency to $freq"
88	cpupower frequency-set -g powersave --max=${freq}MHz >& /dev/null
89	[ $EVALUATE_ONLY -eq 0 ] && run_test $freq
90done
91
92echo "=============================================================================="
93
94echo "The marketing frequency of the cpu is $mkt_freq MHz"
95echo "The maximum frequency of the cpu is $max_freq MHz"
96echo "The minimum frequency of the cpu is $min_freq MHz"
97
98cpupower frequency-set -g powersave --max=${max_freq}MHz >& /dev/null
99
100# make a pretty table
101echo "Target      Actual      Difference     MSR(0x199)     max_perf_pct"
102for freq in `seq $max_freq -100 $min_freq`
103do
104	result_freq=$(cat /tmp/result.${freq} | grep "cpu MHz" | awk ' { print $4 } ' | awk -F "." ' { print $1 } ')
105	msr=$(cat /tmp/result.${freq} | grep "msr" | awk ' { print $3 } ')
106	max_perf_pct=$(cat /tmp/result.${freq} | grep "max_perf_pct" | awk ' { print $2 } ' )
107	if [ $result_freq -eq $freq ]; then
108		echo " $freq        $result_freq             0          $msr         $(($max_perf_pct*3300))"
109	else
110		echo " $freq        $result_freq          $(($result_freq-$freq))          $msr          $(($max_perf_pct*$max_freq))"
111	fi
112done
113exit 0
114