Can you try changing your workload? On Fri, Jun 20, 2014 at 4:57 PM, Salman Ahmed <salman...@yahoo.com> wrote: > I tried 10 times running 15 seconds and out of that 3 times I got output > without any P-state information. > > -- > Thanks, > Salman Ahmed > > > > On Friday, 20 June 2014, 16:49, Amit Kucheria <amit.kuche...@linaro.org> > wrote: > On Fri, Jun 20, 2014 at 4:01 PM, Salman Ahmed <salman...@yahoo.com> wrote: > > > >> Hello Amit, >> >> Actually, I ran it on the same machine with the same command again and these >> time the output has frequency information- >> >> $ sudo ./idlestat --trace -t 5 -f /tmp/myoutput -- top >> >> Log is 4.999547 secs long with 710 events >> clusterA@state hits total(us) avg(us) min(us) max(us) >> C6-SNB 174 4953094.00 28466.06 0.00 183909.00 >> cpu0@state hits total(us) avg(us) min(us) max(us) >> C1-SNB 1 630.00 630.00 630.00 630.00 >> C6-SNB 111 4995205.00 45001.85 8.00 279064.00 >> cpu0 wakeups name count >> irq040 eth0 50 >> cpu1@state hits total(us) avg(us) min(us) max(us) >> C6-SNB 54 4997809.00 92552.02 125.00 323888.00 >> cpu1 wakeups name count >> irq018 ata_piix 10 >> cpu2@state hits total(us) avg(us) min(us) max(us) >> C1-SNB 35 19993.00 571.23 121.00 11699.00 >> C6-SNB 48 4957068.00 103272.25 51.00 323891.00 >> 3101 8 487.00 60.88 1.00 291.00 >> 1600 78 14303.00 183.37 1.00 6144.00 >> cpu2 wakeups name count >> cpu3@state hits total(us) avg(us) min(us) max(us) >> C1-SNB 4 379.00 94.75 25.00 128.00 >> C6-SNB 59 4997441.00 84702.39 60.00 323878.00 >> cpu3 wakeups name count >> >> So, output sometimes contains frequency information and sometimes it doesn't >> with the same command. When it does not, trace file does not contain any >> cpu_frequency entry. So, the problem may not be with idlestat tool since it >> just parses trace file. Is it possible there is any bug in kernel tracing >> code? >> > > Does this happen when you run for longer than 5 seconds? Try running > it for 15 seconds 10 times. I wonder if your platform isn't > transitioning P-states in 5 seconds.
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