diff options
Diffstat (limited to 'tools')
| -rw-r--r-- | tools/testing/selftests/intel_pstate/Makefile | 15 | ||||
| -rw-r--r-- | tools/testing/selftests/intel_pstate/aperf.c | 80 | ||||
| -rw-r--r-- | tools/testing/selftests/intel_pstate/msr.c | 39 | ||||
| -rwxr-xr-x | tools/testing/selftests/intel_pstate/run.sh | 113 |
4 files changed, 247 insertions, 0 deletions
diff --git a/tools/testing/selftests/intel_pstate/Makefile b/tools/testing/selftests/intel_pstate/Makefile new file mode 100644 index 0000000..f5f1a28 --- /dev/null +++ b/tools/testing/selftests/intel_pstate/Makefile @@ -0,0 +1,15 @@ +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) diff --git a/tools/testing/selftests/intel_pstate/aperf.c b/tools/testing/selftests/intel_pstate/aperf.c new file mode 100644 index 0000000..6046e18 --- /dev/null +++ b/tools/testing/selftests/intel_pstate/aperf.c @@ -0,0 +1,80 @@ +#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; +} diff --git a/tools/testing/selftests/intel_pstate/msr.c b/tools/testing/selftests/intel_pstate/msr.c new file mode 100644 index 0000000..abbbfc8 --- /dev/null +++ b/tools/testing/selftests/intel_pstate/msr.c @@ -0,0 +1,39 @@ +#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; +} diff --git a/tools/testing/selftests/intel_pstate/run.sh b/tools/testing/selftests/intel_pstate/run.sh new file mode 100755 index 0000000..bdaf37e --- /dev/null +++ b/tools/testing/selftests/intel_pstate/run.sh @@ -0,0 +1,113 @@ +#!/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 |
