Re: [Xenomai] [PATCH] AT91: SAMA5D3: Adapt Ipipe for AIC5

[Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>]

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On 07/07/2014 06:02 PM, Maxime Ripard wrote:
> On Sat, Jul 05, 2014 at 10:13:51AM +0200, Gilles Chanteperdrix
> wrote:
>>>>> Ok, so, with the changes you mentionned, I can't make the
>>>>> system crash anymore (or at least, not as easily as it used
>>>>> to be).
>>>>> 
>>>>> But: - whenever the program mentionned above calls exit(),
>>>>> it stalls. However, ctrl+c makes the program exit properly,
>>>>> and everything seems fine otherwise - whenever we don't
>>>>> link it against xenomai, it just hangs. I've not figured
>>>>> out why yet
>>>>> 
>>>>> With CONFIG_XENOMAI and CONFIG_IPIPE disabled, it works
>>>>> fine.
>>>> 
>>>> My answer was wrong, you probably need to keep the 
>>>> set_backup/clear_backup calls in he ->hold and ->release
>>>> callbacks, as the linux interrupt may expect the backup areas
>>>> to be in sync. Did you do this, or did you go for the
>>>> alternative?
>>> 
>>> I went for the alternative. I'm sending you a v2 with what I
>>> have so far, that shows the behaviour I was describing.
>> 
>> Could you try the following patch?
> 
> It actually works much better, thanks!
> 
> The above mentionned issues are gone, there's only one last glitch
> I guess. The max latency under load is around a few 100's of ms
> (while idle, it's actually around 200-300us, which seems more
> reasonable.

200us or 300us seems high for a last generation cortex. milliseconds
issues indicate an issue, does the msw column in latency increment?

> 
> Maxime
> 


- -- 
                                                                Gilles.
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