On 10/16/2012 03:16 PM, Leopold Palomo-Avellaneda wrote:
> A Dimarts 16 Octubre 2012, Gilles Chanteperdrix va escriure:
>> On 10/16/2012 01:15 PM, Leopold Palomo-Avellaneda wrote:
>>> A Dimarts 16 Octubre 2012, Gilles Chanteperdrix va escriure:
>>>> On 10/16/2012 12:08 AM, Jeff Webb wrote:
>>>>
>>>>> I am trying to build xenomai from the xenomai-2.6.git repo under
>>>>> ubuntu 12.04 on a x86_64 desktop machine. When I try to build a
>>>>> xenomai-enabled kernel from the 3.2.21 sources, the build fails with
>>>>> a compile error. (Sorry, I didn't save the error message, but I can
>>>>> repeat the process if necessary.) In order to get things to compile,
>>>>> I made the following change to ipipe-core-3.2.21-x86-1.patch. Is
>>>>> this a bug? If so, I'm wondering why no one else has run into this
>>>>> one yet. I think I built a kernel without any compiler errors under
>>>>> ubuntu 10.04 using this patch, but I'm not 100% certain about that.
>>>>
>>>>
>>>> Yep, it has been reported already, and is fixed in the 3.4 branch, not
>>>> backported in 3.2 yet.
>>>
>>> hi,
>>>
>>> 1) does it means that this patch could be considered a backport to 3.2?
>>>
>>> 2) we use orocos and their xenomai part. We have found that when we run an
>>> application in xenomai, although the framework could do it, there's no
>>> migration between cpus, and all is executed in cpu0. The main developer
> have
>>> commented that a some test isolating xenomai should be done.
>>>
>>> I have seen that the patch touch something of affinity. Some one you have
>>> experienced some trouble when you run a multithread application and all
> the
>>> threads are executed in cpu0 and no migration is done?
>>
>> A migration is detrimental to determinism, so Xenomai takes the easy way
>> out of this dilemna: absolutely no migration is done automatically. So,
>> if you want to run a thread on a different cpu, you have to set the
>> affinity yourself. It has always been that way.
>
> We do it using the Orocos api, but it doesn't work, so we don't know if it's
> a
> Orocos problem or Xenomai problem.
What is the return value of sched_setaffinity?
--
Gilles.
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