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
32if ! uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ | grep -q x86; then
33	echo "$0 # Skipped: Test can only run on x86 architectures."
34	exit 0
35fi
36
37max_cpus=$(($(nproc)-1))
38
39function run_test () {
40
41	file_ext=$1
42	for cpu in `seq 0 $max_cpus`
43	do
44		echo "launching aperf load on $cpu"
45		./aperf $cpu &
46	done
47
48	echo "sleeping for 5 seconds"
49	sleep 5
50	num_freqs=$(cat /proc/cpuinfo | grep MHz | sort -u | wc -l)
51	if [ $num_freqs -le 2 ]; then
52		cat /proc/cpuinfo | grep MHz | sort -u | tail -1 > /tmp/result.$1
53	else
54		cat /proc/cpuinfo | grep MHz | sort -u > /tmp/result.$1
55	fi
56	./msr 0 >> /tmp/result.$1
57
58	max_perf_pct=$(cat /sys/devices/system/cpu/intel_pstate/max_perf_pct)
59	echo "max_perf_pct $max_perf_pct" >> /tmp/result.$1
60
61	for job in `jobs -p`
62	do
63		echo "waiting for job id $job"
64		wait $job
65	done
66}
67
68#
69# MAIN (ALL UNITS IN MHZ)
70#
71
72# Get the marketing frequency
73_mkt_freq=$(cat /proc/cpuinfo | grep -m 1 "model name" | awk '{print $NF}')
74_mkt_freq=$(echo $_mkt_freq | tr -d [:alpha:][:punct:])
75mkt_freq=${_mkt_freq}0
76
77# Get the ranges from cpupower
78_min_freq=$(cpupower frequency-info -l | tail -1 | awk ' { print $1 } ')
79min_freq=$(($_min_freq / 1000))
80_max_freq=$(cpupower frequency-info -l | tail -1 | awk ' { print $2 } ')
81max_freq=$(($_max_freq / 1000))
82
83
84for freq in `seq $max_freq -100 $min_freq`
85do
86	echo "Setting maximum frequency to $freq"
87	cpupower frequency-set -g powersave --max=${freq}MHz >& /dev/null
88	[ $EVALUATE_ONLY -eq 0 ] && run_test $freq
89done
90
91echo "=============================================================================="
92
93echo "The marketing frequency of the cpu is $mkt_freq MHz"
94echo "The maximum frequency of the cpu is $max_freq MHz"
95echo "The minimum frequency of the cpu is $min_freq MHz"
96
97cpupower frequency-set -g powersave --max=${max_freq}MHz >& /dev/null
98
99# make a pretty table
100echo "Target      Actual      Difference     MSR(0x199)     max_perf_pct"
101for freq in `seq $max_freq -100 $min_freq`
102do
103	result_freq=$(cat /tmp/result.${freq} | grep "cpu MHz" | awk ' { print $4 } ' | awk -F "." ' { print $1 } ')
104	msr=$(cat /tmp/result.${freq} | grep "msr" | awk ' { print $3 } ')
105	max_perf_pct=$(cat /tmp/result.${freq} | grep "max_perf_pct" | awk ' { print $2 } ' )
106	if [ $result_freq -eq $freq ]; then
107		echo " $freq        $result_freq             0          $msr         $(($max_perf_pct*3300))"
108	else
109		echo " $freq        $result_freq          $(($result_freq-$freq))          $msr          $(($max_perf_pct*$max_freq))"
110	fi
111done
112exit 0
113