Re: [Xenomai-core] [PATCH] fix hw-timer setup/cleanup for i386

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

Stelian Pop wrote:
> On Fri, Oct 12, 2007 at 11:14:43AM +0200, Jan Kiszka wrote:
> 
>> Hmm, that's not too different from my own test setup.
> 
> I'm attaching the .config and dmesg in case you see something strange.
> 
>> /proc/xenomai/timerstat/master may provide further hints about the state
>> of the host timer (please keep my patch applied for this).
> 
> /proc/xenomai/timerstat/master says:
> 
> CPU  SCHEDULED   FIRED       TIMEOUT    INTERVAL   HANDLER      NAME
> 0    1           1           -          -          NULL         [host-timer]
> 
>> Also, you
>> could take an I-pipe trace around the timer takeover and the following
>> few milliseconds, using the new trigger feature:
>>
>> echo rthal_timer_request > /proc/ipipe/trace/trigger
> 
> It gives this:
> 
> root@domain.hid# cat /proc/ipipe/trace/max

/frozen holds the result. Also, a bit more post_trace_points may help to
see what goes on after that function is called.

> 
>> BTW, does the latency test of Xenomai work?
> 
> No. It hangs after "warming up". I'm able to interrupt with ^C and then
> it prints a single line showing a max latency of 208983.492 ms (same value
> on several invocations).

Ah, then we may fail to program the APIC appropriately. That would need
a closer look if you want to dig into this. /me is going to be
distracted from this for now.

Jan

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