Re: [Xenomai-help] Xenomai IRQ Disable

[Jan Kiszka <jan.kiszka@domain.hid>]

Jan Kiszka wrote:
> Jan Kiszka wrote:
>> Stuart O Anderson wrote:
>>> Oh - I forgot to mention - when I boot the machine, about 50% of the
>>> time it comes up with the keyboard and mouse locked by the time it
>>> gets to a login screen.  The rest of the time it's fine until I run my
>>> rtnet program.  I suspect this is because some interrupt is randomly
>>> getting assigned on boot to one processor or the other, and when it's
>>> the wrong one things break?

That's why I would like to make things more deterministic by freezing
the cpu affinity. Also, if the issue is a race between cpus, one could
narrow it down a bit by pushing all Xenomai load on one cpu e.g.

>>>
>>> ipipe version: 2.0-08
>>> kernel config: attached
>>> varying versions: will try this when I have more time
>>> playing with affinities: I'm trying to find documentation for
>>> /proc/xenomai/affinity - do you know where it is located?
>> Don't think we have any, however the usage is straightforward: This is a
>> bitmask describing the CPUs on which Xenomai threads and IRQs that will
>> be created in the future shall be bound to. Just set it before firing up
>> RTnet and your application.
>>
>> BTW, I found a hint on an "IRQ19 issue" in my archive, but I still need
>> to interview my colleague on details.

We had such an issue with a SCSI RAID controller. Even after deep
debugging inside ipipe, the problem looked like a race during hardware
initialization and finally disappeared after reconfiguring the SCSI
controller's firmware. So we closed the issue.

Jan

-- 
Siemens AG, Corporate Technology, CT SE 2
Corporate Competence Center Embedded Linux