Hi,
i put xenomai 2.6.2.1 with patch 'ipipe-core-3.4.6-arm-4.patch' on a
vanilla kernel 3.4.6 for a karo tx28 board (tx28 has imx28 processor
that uses standard clock management to access the timer).
I run the latency test but seems to have very high latency.
(I saw always that every 5 records the 'lat avg' is higher than previous.
Also when i run after some seconds the command 'ls -lR /' from a telnet
console for increaseing interrupts the 'lat min' is raised to 54.200~ us )
i read correcly the data below or i misunderstanding the behaviour ?
Are there some kernel features to disable ?
Thanks for all
root@triton1:/# /usr/xenomai/bin/latency
== Sampling period: 1000 us
== Test mode: periodic user-mode task
== All results in microseconds
warming up...
RTT| 00:00:01 (periodic user-mode task, 1000 us period, priority 99)
RTH|----lat min|----lat avg|----lat max|-overrun|---msw|---lat
best|--lat worst
RTD| -0.375| 16.208| 70.624| 0| 0| -0.375| 70.624
RTD| 0.000| 1.749| 74.624| 0| 0| -0.375| 74.624
RTD| 0.083| 1.624| 72.458| 0| 0| -0.375| 74.624
RTD| 0.000| 1.666| 70.916| 0| 0| -0.375| 74.624
RTD| 0.000| 1.541| 72.499| 0| 0| -0.375| 74.624
RTD| -0.042| 16.083| 71.416| 0| 0| -0.375| 74.624
RTD| 0.124| 1.666| 75.499| 0| 0| -0.375| 75.499
RTD| 0.083| 1.624| 71.791| 0| 0| -0.375| 75.499
RTD| -0.084| 1.583| 73.374| 0| 0| -0.375| 75.499
RTD| -0.042| 1.541| 70.249| 0| 0| -0.375| 75.499
RTD| 0.041| 15.708| 71.124| 0| 0| -0.375| 75.499
RTD| 0.041| 1.583| 75.541| 0| 0| -0.375| 75.541
RTD| 0.124| 1.583| 70.124| 0| 0| -0.375| 75.541
RTD| 0.041| 1.624| 70.749| 0| 0| -0.375| 75.541
RTD| -0.042| 1.499| 72.041| 0| 0| -0.375| 75.541
RTD| 0.041| 15.333| 74.749| 0| 0| -0.375| 75.541
RTD| 54.208| 68.833| 72.999| 0| 0| -0.375| 75.541
RTD| 52.083| 68.833| 73.249| 0| 0| -0.375| 75.541
RTD| 54.874| 68.874| 80.208| 0| 0| -0.375| 80.208
RTD| 53.416| 68.833| 71.041| 0| 0| -0.375| 80.208
RTD| 52.374| 68.833| 80.541| 0| 0| -0.375| 80.541
RTT| 00:00:22 (periodic user-mode task, 1000 us period, priority 99)
RTH|----lat min|----lat avg|----lat max|-overrun|---msw|---lat
best|--lat worst
RTD| 53.749| 68.874| 73.624| 0| 0| -0.375| 80.541
RTD| 54.624| 68.833| 70.999| 0| 0| -0.375| 80.541
RTD| 54.124| 68.833| 72.374| 0| 0| -0.375| 80.541
RTD| 53.374| 68.874| 74.333| 0| 0| -0.375| 80.541
RTD| 54.083| 68.833| 73.791| 0| 0| -0.375| 80.541
RTD| 53.958| 69.166| 92.958| 0| 0| -0.375| 92.958
RTD| 53.583| 68.916| 77.041| 0| 0| -0.375| 92.958
RTD| 54.374| 68.833| 76.041| 0| 0| -0.375| 92.958
RTD| 53.833| 68.874| 74.958| 0| 0| -0.375| 92.958
RTD| 50.124| 68.833| 74.833| 0| 0| -0.375| 92.958
RTD| 53.874| 68.833| 74.291| 0| 0| -0.375| 92.958
RTD| 57.083| 70.749| 93.916| 0| 0| -0.375| 93.916
RTD| 57.291| 73.041| 87.208| 0| 0| -0.375| 93.916
RTD| 55.999| 71.583| 87.791| 0| 0| -0.375| 93.916
RTD| 55.041| 73.958| 85.083| 0| 0| -0.375| 93.916
RTD| 65.374| 74.708| 85.999| 0| 0| -0.375| 93.916
RTD| 60.916| 74.708| 85.458| 0| 0| -0.375| 93.916
RTD| 58.749| 74.708| 86.041| 0| 0| -0.375| 93.916
RTD| 60.166| 74.541| 85.458| 0| 0| -0.375| 93.916
RTD| 60.208| 74.583| 85.416| 0| 0| -0.375| 93.916
RTD| 62.874| 74.583| 91.083| 0| 0| -0.375| 93.916
RTT| 00:00:43 (periodic user-mode task, 1000 us period, priority 99)
RTH|----lat min|----lat avg|----lat max|-overrun|---msw|---lat
best|--lat worst
RTD| 57.083| 71.958| 88.166| 0| 0| -0.375| 93.916
RTD| 63.291| 74.124| 92.249| 0| 0| -0.375| 93.916
RTD| 66.958| 74.458| 86.333| 0| 0| -0.375| 93.916
RTD| 63.541| 74.499| 83.624| 0| 0| -0.375| 93.916
RTD| 62.874| 74.541| 86.708| 0| 0| -0.375| 93.916
RTD| 62.458| 74.541| 87.666| 0| 0| -0.375| 93.916
RTD| 64.916| 74.749| 84.166| 0| 0| -0.375| 93.916
RTD| 64.041| 74.541| 86.208| 0| 0| -0.375| 93.916
RTD| 64.749| 74.583| 88.583| 0| 0| -0.375| 93.916
RTD| 55.833| 73.791| 89.041| 0| 0| -0.375| 93.916
RTD| 55.124| 71.249| 88.499| 0| 0| -0.375| 93.916
RTD| 55.583| 71.208| 95.041| 0| 0| -0.375| 95.041
RTD| 51.916| 72.041| 89.458| 0| 0| -0.375| 95.041
RTD| 57.833| 71.083| 86.833| 0| 0| -0.375| 95.041
RTD| 52.541| 68.874| 75.124| 0| 0| -0.375| 95.041
RTD| 54.541| 68.874| 80.249| 0| 0| -0.375| 95.041
RTD| 52.708| 68.833| 74.416| 0| 0| -0.375| 95.041
RTD| 55.166| 68.833| 74.416| 0| 0| -0.375| 95.041
RTD| 53.874| 68.833| 73.291| 0| 0| -0.375| 95.041
RTD| 53.791| 68.874| 78.083| 0| 0| -0.375| 95.041
RTD| 52.416| 68.791| 74.041| 0| 0| -0.375| 95.041
RTT| 00:01:04 (periodic user-mode task, 1000 us period, priority 99)
RTH|----lat min|----lat avg|----lat max|-overrun|---msw|---lat
best|--lat worst
RTD| 52.208| 68.874| 73.749| 0| 0| -0.375| 95.041
^C---|-----------|-----------|-----------|--------|------|-------------------------
RTS| -0.375| 54.666| 95.041| 0| 0| 00:01:04/00:01:04
--
+------------------------------------------------------------------------------------------------+
Roberto Bielli
Sviluppo Software
Axel S.r.l.
Via Del Cannino, 3
21020 Crosio Della Valle
Varese - Italy
Telefono: +39 0332 949600
Fax: +39 0332 969315
E-mail: [email protected]
Web Site: www.axelsw.it
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