tools/testing/selftests/intel_pstate/run.sh

Source file repositories/reference/linux-study-clean/tools/testing/selftests/intel_pstate/run.sh

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/intel_pstate/run.sh
Extension
.sh
Size
4220 bytes
Lines
134
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: tools
Status
atlas-only

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

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
	grep MHz /proc/cpuinfo | sort -u > /tmp/result.freqs
	num_freqs=$(wc -l /tmp/result.freqs | awk ' { print $1 } ')
	if [ $num_freqs -ge 2 ]; then
		tail -n 1 /tmp/result.freqs > /tmp/result.$1
	else
		cp /tmp/result.freqs /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))


[ $EVALUATE_ONLY -eq 0 ] && 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
	run_test $freq
done

[ $EVALUATE_ONLY -eq 0 ] && cpupower frequency-set -g powersave --max=${max_freq}MHz >& /dev/null

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"

# make a pretty table
echo "Target Actual Difference MSR(0x199) max_perf_pct" | tr " " "\n" > /tmp/result.tab
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 } ' )
	cat >> /tmp/result.tab << EOF
$freq
$result_freq

Annotation

Implementation Notes