Re: [Sched-tools] [RESEND PATCH v2] doc: measure the efficiency of cpufreq governors

Hi Xunlei,

On 22 June 2015 at 15:43, Vincent Guittot vincent.guittot@linaro.org wrote:

Hi Xunlei,

On 18 June 2015 at 11:06, Xunlei Pang xlpang@126.com wrote:

...

From: Xunlei Pang pang.xunlei@linaro.org

DVFS adds a latency in the execution of task because of the time to

...

•           if [ "$gov_next" != "" ] ; then
  

•                   dvfs.sh $gov_next $1 $2 $3 > $FILENAME
  

•                   data=$(cat $FILENAME |sed -n '1p');
  

•                   numerator=$(expr $powersave - $data)
  

•                   numerator=$(expr $numerator \* 100)
  

•                   if [ $numerator -lt 0 ] ; then
  

•                           let numerator=0
  

numerator=0 should be enough

...

•                   fi
  

•                   data=$(expr $numerator / $denominator)
  

•                   echo "$gov_next efficiency: $data%"
  

•           fi
  

•   done
  

•   rm -f $FILENAME
  

+}