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From: Philippe Gerum <rpm@xenomai.org>
Message-ID: <55E05B2E.60907@xenomai.org>
Date: Fri, 28 Aug 2015 14:59:26 +0200
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Subject: Re: [Xenomai] Cyclictest in Xenomai-3
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To: Konstantinos Chalas <konchalas@gmail.com>, xenomai@xenomai.org

On 08/28/2015 02:51 PM, Konstantinos Chalas wrote:
> Hello,
> 
> root@beaglebone:~# uname -a
> Linux beaglebone 3.14.44+ #1 SMP PREEMPT Wed Aug 26 23:41:20 CEST 2015
> armv7l GNU/Linux
> 
> and ipipe-core-3.14.44-arm-12
> 

Do you have any weird values appearing during a standard latency test? e.g.

# latency [-t0]

> Thanks
> 
> On 08/28/2015 02:46 PM, Philippe Gerum wrote:
>> On 08/28/2015 02:37 PM, Konstantinos Chalas wrote:
>>> Great! Now, it is much better! Thanks for the interest.
>>>
>>> I have noticed something else, when using clock_nanosleep, there is
>>> something wrong going on. Example output with clock_nanosleep:
>>>
>>> root@beaglebone:~# cyclictest    -p 99  -i 250 -n
>>> # /dev/cpu_dma_latency set to 0us
>>> policy: fifo: loadavg: 1.13 1.18 1.15 1/243 2385         
>>>
>>> T: 0 ( 2384) P:99 I:250 C: 122168 Min:      0 Act:    9 *Avg:2147483647*
>>> Max:      -1
>>>
>>> The Avg value jumps to this insane number.
>>> I didn't find any differences between the vanilla cyclictest and the
>>> xenomai-2.6 upstream cyclictest regarding the use of clock_nanosleep.
>>> Any ideas of where this behaviour would come from?
>> Which kernel and I-pipe release are you running?
>>
> 


-- 
Philippe.