tools, testing, add test for intel_pstate driver

CC := $(CROSS_COMPILE)gcc

CFLAGS := $(CFLAGS) -Wall -D_GNU_SOURCE

LDFLAGS := $(LDFLAGS) -lm

TARGETS := msr aperf

TEST_PROGS := $(TARGETS) run.sh

.PHONY: all clean

all: $(TARGETS)

$(TARGETS): $(HEADERS)

clean:

	rm -f $(TARGETS)

#include <math.h>

#include <unistd.h>

#include <stdio.h>

#include <stdlib.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <fcntl.h>

#include <sys/timeb.h>

#include <sched.h>

#include <errno.h>

void usage(char *name) {

	printf ("Usage: %s cpunum\n", name);

}

int main(int argc, char **argv) {

	int i, cpu, fd;

	char msr_file_name[64];

	long long tsc, old_tsc, new_tsc;

	long long aperf, old_aperf, new_aperf;

	long long mperf, old_mperf, new_mperf;

	struct timeb before, after;

	long long int start, finish, total;

	cpu_set_t cpuset;

	if (argc != 2) {

		usage(argv[0]);

		return 1;

	}

	errno = 0;

	cpu = strtol(argv[1], (char **) NULL, 10);

	if (errno) {

		usage(argv[0]);

		return 1;

	}

	sprintf(msr_file_name, "/dev/cpu/%d/msr", cpu);

	fd = open(msr_file_name, O_RDONLY);

	if (fd == -1) {

		perror("Failed to open");

		return 1;

	}

	CPU_ZERO(&cpuset);

	CPU_SET(cpu, &cpuset);

	if (sched_setaffinity(0, sizeof(cpu_set_t), &cpuset)) {

		perror("Failed to set cpu affinity");

		return 1;

	}

	ftime(&before);

	pread(fd, &old_tsc,  sizeof(old_tsc), 0x10);

	pread(fd, &old_aperf,  sizeof(old_mperf), 0xe7);

	pread(fd, &old_mperf,  sizeof(old_aperf), 0xe8);

	for (i=0; i<0x8fffffff; i++) {

		sqrt(i);

	}

	ftime(&after);

	pread(fd, &new_tsc,  sizeof(new_tsc), 0x10);

	pread(fd, &new_aperf,  sizeof(new_mperf), 0xe7);

	pread(fd, &new_mperf,  sizeof(new_aperf), 0xe8);

	tsc = new_tsc-old_tsc;

	aperf = new_aperf-old_aperf;

	mperf = new_mperf-old_mperf;

	start = before.time*1000 + before.millitm;

	finish = after.time*1000 + after.millitm;

	total = finish - start;

	printf("runTime: %4.2f\n", 1.0*total/1000);

	printf("freq: %7.0f\n", tsc / (1.0*aperf / (1.0 * mperf)) / total);

	return 0;

}

#include <math.h>

#include <unistd.h>

#include <stdio.h>

#include <stdlib.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <fcntl.h>

#include <sys/timeb.h>

#include <sched.h>

#include <errno.h>

int main(int argc, char **argv) {

	int cpu, fd;

	long long msr;

	char msr_file_name[64];

	if (argc != 2)

		return 1;

	errno = 0;

	cpu = strtol(argv[1], (char **) NULL, 10);

	if (errno)

		return 1;

	sprintf(msr_file_name, "/dev/cpu/%d/msr", cpu);

	fd = open(msr_file_name, O_RDONLY);

	if (fd == -1) {

		perror("Failed to open");

		return 1;

	}

	pread(fd, &msr,  sizeof(msr), 0x199);

	printf("msr 0x199: 0x%llx\n", msr);

	return 0;

}

#!/bin/bash

#

# 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

max_cpus=$(($(nproc)-1))

# compile programs

gcc -o aperf aperf.c -lm

[ $? -ne 0 ] && echo "Problem compiling aperf.c." && exit 1

gcc -o msr msr.c -lm

[ $? -ne 0 ] && echo "Problem compiling msr.c." && exit 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

	num_freqs=$(cat /proc/cpuinfo | grep MHz | sort -u | wc -l)

	if [ $num_freqs -le 2 ]; then

		cat /proc/cpuinfo | grep MHz | sort -u | tail -1 > /tmp/result.$1

	else

		cat /proc/cpuinfo | grep MHz | sort -u > /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))

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

	[ $EVALUATE_ONLY -eq 0 ] && 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"

cpupower frequency-set -g powersave --max=${max_freq}MHz >& /dev/null

# make a pretty table

echo "Target      Actual      Difference     MSR(0x199)     max_perf_pct"

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 } ' )

	if [ $result_freq -eq $freq ]; then

		echo " $freq        $result_freq             0          $msr         $(($max_perf_pct*3300))"

	else

		echo " $freq        $result_freq          $(($result_freq-$freq))          $msr          $(($max_perf_pct*$max_freq))"

	fi

done

exit 0