Dear All,
I was trying all latency benchmark programs, in one such session, i had
loaded my linux with some program which will read the hard drive to
create an iso image. This program had taken my Dual core processor to
100%. And both core showed up 100% in gnome-system-monitor.
While this was running, i tried the klatency benchmarks, i got some
strange results :
r...@shashank-desktop:/usr/share/xenomai/testsuite/klatency# ./run
*
*
* Type ^C to stop this application.
*
*
== Sampling period: 100 us
== Test mode: in-kernel periodic task
== All results in microseconds
warming up...
RTT| 00:00:00 (in-kernel periodic task, 100 us period, priority 99)
RTH|-lat min|-lat avg|-lat max|-overrun|lat best|---lat
RTD| -2.593| -2.410| 2.229| 0| -2.593| 2.229
RTD|100.000| 0.001| 0.000| -2590| -2.411| -0.001
RTD| -4.821|2419.968| -0.001| -2590| -2.411| -0.001
RTD|100.000| 0.001| 0.000| -2585| -2.381| -0.001
RTD| -7.202|2419.968| -0.001| -2585| -2.381| -0.001
RTD|100.000| 0.001| 0.000| -2585| -2.405| -0.001
RTD| -9.607|2419.968| -0.001| -2585| -2.405| -0.001
RTD|100.000| 0.001| 0.000| -2587| -2.380| -0.001
RTD|-11.987|2419.968| -0.001| -2587| -2.380| -0.001
RTD|100.000| 0.001| 0.000| -2579| -2.360| -0.001
RTD|-14.347|2419.968| -0.001| -2579| -2.360| -0.001
RTD|100.000| 0.001| 0.000| -2598| -2.359| -0.001
RTD|-16.706|2419.968| -0.001| -2598| -2.359| -0.001
RTD|100.000| 0.001| 0.000| -2588| -2.373| -0.001
RTD|-19.079|2419.968| -0.001| -2588| -2.373| -0.001
RTD|100.000| 0.001| 0.000| -2668| -2.397| -0.001
RTD|-21.476|2419.968| -0.001| -2668| -2.397| -0.001
RTD|100.000| 0.001| 0.000| -2589| -2.405| -0.001
RTD|-23.881|2419.968| -0.001| -2589| -2.405| -0.001
RTD|100.000| 0.001| 0.000| -2588| -2.406| -0.001
RTD|-26.287|2419.968| -0.001| -2588| -2.406| -0.001
Then i tried the same with user space latency benchmarks, and these are
the results i got:
r...@shashank-desktop:/usr/share/xenomai/testsuite/latency# ./run
*
*
* Type ^C to stop this application.
*
*
== Sampling period: 100 us
== Test mode: periodic user-mode task
== All results in microseconds
warming up...
RTT| 00:00:01 (periodic user-mode task, 100 us period, priority 99)
RTH|--lat min|-lat avg|-lat max|-overrun|lat best|---worst
RTD| -0.851| -0.165| 8.607| 0| -0.851| 8.607
RTD| -0.861| -0.297| 8.141| 0| -0.861| 8.607
RTD| -0.876| -0.357| 6.562| 0| -0.876| 8.607
RTD| -0.881| -0.367| 10.051| 0| -0.881| 10.051
RTD| -0.871| -0.214| 6.487| 0| -0.881| 10.051
RTD| -0.866| -0.246| 9.038| 0| -0.881| 10.051
RTD| -0.871| -0.247| 10.677| 0| -0.881| 10.677
RTD| -0.886| -0.307| 10.597| 0| -0.886| 10.677
RTD| -0.840| -0.251| 11.880| 0| -0.886| 11.880
RTD| -0.861| -0.301| 8.873| 0| -0.886| 11.880
RTD| -1.081| -0.415| 6.582| 0| -1.081| 11.880
RTD| -0.891| -0.395| 7.925| 0| -1.081| 11.880
RTD| -0.896| -0.352| 8.622| 0| -1.081| 11.880
RTD| -0.896| -0.398| 9.259| 0| -1.081| 11.880
RTD| -0.881| -0.287| 7.459| 0| -1.081| 11.880
RTD| -0.891| -0.155| 10.081| 0| -1.081| 11.880
RTD| -0.871| -0.147| 8.572| 0| -1.081| 11.880
RTD| -0.861| -0.232| 6.432| 0| -1.081| 11.880
RTD| -0.876| -0.397| 12.181| 0| -1.081| 12.181
RTD| -0.881| -0.397| 6.858| 0| -1.081| 12.181
RTD| -0.886| -0.349| 6.667| 0| -1.081| 12.181
My CPU is a dual core intel processor 1.8 GHz, and i am using
xenomai-2.4.8 with 2.6.28.9 kernel.
-Shashank
-
Hi-Tech Gears Limited, Gurgaon, India
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