[Xenomai] The latency test hangs

[Xenomai] The latency test hangs

[Dauphin Alexandre]

Hello,

My probleme is that i can't launch any latency tests , they always hang .
I work with a Imx6 quad core board ( arm architecture ) , my kernel version is :

# cat /proc/version
Linux version 3.0.43 (root@modx6sdk) (gcc version 4.7.1 20120402 (prerelease) (crosstool-NG linaro-1.13.1-2012.04-20120426 - Linaro GCC 2012.04) )

there , is the xenomai configuration i used :
# /usr/xenomai/bin/xeno-config
xeno-config --verbose
        --version="2.6.4"
        --cc="arm-linux-gnueabi-gcc"
        --arch="arm"
        --prefix="/usr/xenomai"
        --xeno-cflags="-I/usr/xenomai/include -D_GNU_SOURCE -D_REENTRANT -D__XENO__"
        --xeno-ldflags="-L/usr/xenomai/lib -lxenomai -lpthread -lrt "
        --posix-cflags=""
        --posix-ldflags="-Wl,@/usr/xenomai/lib/posix.wrappers -L/usr/xenomai/lib -lpthread_rt -lxenomai -lpthread -lrt "
        --library-dir="/usr/xenomai/lib"

Whene i run some latency test , it always hangs after "warming up..." and nothing append then..

# /usr/xenomai/bin/latency -p 1000
== Sampling period: 120000 us
== Test mode: periodic user-mode task
== All results in microseconds
warming up...

I tried to change the periode ,but it doesn't make any changes.

# /usr/xenomai/bin/latency -p 120000 -T 600
== Sampling period: 120000 us
== Test mode: periodic user-mode task
== All results in microseconds
warming up...
---|-----------|-----------|-----------|--------|------|-------------------------
RTS|  25252.525|      0.000| -25252.526|       0|     0|    00:10:00/00:10:00

In my configuration , CONFIG_CPU_FREQ  , CONFIG_CPU_IDLE and CONFIG_KGDB  are disable ;

I don't know what is wrong with my configuration and i thank you a lot for your help.

Thanks you,
Alex
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Re: [Xenomai] The latency test hangs

[Gilles Chanteperdrix]

On Sun, Feb 08, 2015 at 06:30:43PM +0100, Dauphin Alexandre wrote:
> 
> Hello,
> 
> My probleme is that i can't launch any latency tests , they always hang .
> I work with a Imx6 quad core board ( arm architecture ) , my kernel version is :
> 
> # cat /proc/version
> Linux version 3.0.43 (root@modx6sdk) (gcc version 4.7.1 20120402 (prerelease) (crosstool-NG linaro-1.13.1-2012.04-20120426 - Linaro GCC 2012.04) )
> 
> there , is the xenomai configuration i used :
> # /usr/xenomai/bin/xeno-config
> xeno-config --verbose
>         --version="2.6.4"
>         --cc="arm-linux-gnueabi-gcc"
>         --arch="arm"
>         --prefix="/usr/xenomai"
>         --xeno-cflags="-I/usr/xenomai/include -D_GNU_SOURCE -D_REENTRANT -D__XENO__"
>         --xeno-ldflags="-L/usr/xenomai/lib -lxenomai -lpthread -lrt "
>         --posix-cflags=""
>         --posix-ldflags="-Wl,@/usr/xenomai/lib/posix.wrappers -L/usr/xenomai/lib -lpthread_rt -lxenomai -lpthread -lrt "
>         --library-dir="/usr/xenomai/lib"
> 
> Whene i run some latency test , it always hangs after "warming up..." and nothing append then..
> 
> # /usr/xenomai/bin/latency -p 1000
> == Sampling period: 120000 us
> == Test mode: periodic user-mode task
> == All results in microseconds
> warming up...

I do not see how this is possible, if you pass -p 1000, you should
read: Sampling period: 1000 us.

> 
> I tried to change the periode ,but it doesn't make any changes.
> 
> # /usr/xenomai/bin/latency -p 120000 -T 600

with -p 120000 you request for a 2 minutes sampling period. I am not
sure this can even work, I would say latency can not work with a
period larger than 1s.

-- 
					    Gilles.

Re: [Xenomai] The latency test hangs

[Gilles Chanteperdrix]

On Sun, Feb 08, 2015 at 07:48:18PM +0100, Dauphin Alexandre wrote:
> 
> Thanks you for your answer.
> I knows that 120000 is too long. But when i tried sampling with 10
> us

Sampling with 10us should cause a lockup, and trigger the watchdog.

> ,100us or 1000us.
> It's the same result , nothing append.

100us or 1000us should be fine, have you tried waiting a few seconds
before interrupting the test? "warming up" means that nothing
happens for some 1s.

Please stay on the list.

-- 
					    Gilles.