Re: [Sched-tools] [RESEND PATCH v3] doc: measure the efficiency of cpufreq governors

On 27 June 2015 at 07:58, pang.xunlei@zte.com.cn wrote:

Hi Vincent,

Vincent Guittot vincent.guittot@linaro.org wrote 2015-06-25 PM 08:37:41:

...

Sched Tools sched-tools@lists.linaro.org, Amit Kucheria amit.kucheria@linaro.org, Lisa Nguyen lisa.nguyen@linaro.org, mturquette mturquette@baylibre.com, Xunlei Pang

pang.xunlei@linaro.org

...

主题

Re: [RESEND PATCH v3] doc: measure the efficiency of cpufreq governors

Hi Xunlei,

On 24 June 2015 at 09:37, Xunlei Pang xlpang@126.com wrote:

...

From: Xunlei Pang pang.xunlei@linaro.org

[snip]

...

diff --git a/doc/examples/cpufreq_governor_efficiency/test.sh b/

doc/examples/cpufreq_governor_efficiency/test.sh

...

new file mode 100755 index 0000000..0160952 --- /dev/null +++ b/doc/examples/cpufreq_governor_efficiency/test.sh @@ -0,0 +1,104 @@ +#!/bin/sh

+set -e

+test_efficiency() {

•   FILENAME="results_$RANDOM$$.txt"
  

•   if [ -e /sys/devices/system/cpu/cpu0/cpufreq/
  

scaling_available_governors ]; then

cpu0 should be replaced by the target CPU: cpu$2

For "scaling_available_governors", should it be always the same for all the cpus in the same kernel?

You're right, i was wondering if some governors could be forbidden for some clusters of cpus but it's not the case.

Vincent

-Xunlei

...

...

•           for i in $(cat /sys/devices/system/cpu/cpu0/
  

cpufreq/scaling_available_governors); do

idem

...

•                   if [ $i = $1 ] ; then
  

•                           gov_target=$i
  

•                   fi
  

•                   export gov_$i=$(echo $i)
  

•           done
  

•   else
  

•           echo "cpufreq sysfs is not available!"
  

•           exit
  

•   fi
  

•   if [ ! $gov_target ] ; then
  

•           echo " Can't find $1 governor!"
  

•           exit
  

•   fi
  

•   if [ ! $gov_performance ] ; then
  

•           echo "Can't find performance governor!"
  

•           exit
  

•   fi
  

•   if [ ! $gov_powersave ] ; then
  

•           echo "Can't find powersave governor!"
  

•           exit
  

•   fi
  

•   if [ $gov_target = $gov_performance ] || [ $gov_target =
  

$gov_powersave ] ; then

...

•           echo "Please input a governor other than
  

"performance" or "powersave""

...

•           exit
  

[snip]

...

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