Re: [Xenomai-core] [PATCH] Fix host IRQ propagation

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

Jan Kiszka wrote:
> Martin Shepherd wrote:
>> On Wed, 13 May 2009, Jan Kiszka wrote:
>>> ...
>>> Martin, could you check if this helps you, too?
>> It doesn't appear to help. To check, first I turned on the HPET and PM
>> timer options, and recompiled the kernel without your patch, to verify
>> that this reproduced the problem. I then manually applied your patch
>> to include/asm-generic/xenomai/hal.h in the kernel source tree,
>> recompiled the kernel, installed etc, and rebooted. However even with
>> the patch in place, whenever I ran:
>>
>>   dd if=/dev/zero of=/dev/null count=20000000
>>
>> then initially top showed that dd was getting very little CPU time
>> (<10%), then after 30 seconds or so, the system became completely
>> unresponsive until the dd ended. This is how it acts without the patch
>> as well. So it doesn't appear that the patch has made any difference
>> to this problem.
> 
> Hmm, so there is no Xenomai task running during this test, just Linux
> load? Tried to reproduce with my kernel here (both HPET and PM enabled,
> as usual), but no success. Strange.

Just having HPET and PM_TIMER enabled is not enough: your CPU needs to
actually have an HPET timer or PM timer.

-- 
                                                 Gilles.