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Date: Fri, 17 Jul 2009 18:14:42 +0200
From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
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Subject: Re: [Xenomai-help] Xenomai on Crusoe TM5900
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To: Pierre Ficheux <pierre.ficheux@domain.hid>
Cc: xenomai@xenomai.org

Pierre Ficheux wrote:
> Hi all,
> 
> I try to use Xenomai on TM5900 CPU:
> 
> Kernel is 2.6.28.9
> Xenomai is 2.4.8
> 
> First configuration (CONFIG_HPET_TIMER is not set) gives lots of
> overruns with latency program:
> 
> == Sampling period: 100 us
> == Test mode: periodic user-mode task
> == All results in microseconds
> warming up...
> RTT|  00:00:01  (periodic user-mode task, 100 us period, priority 99)
> RTH|-----lat min|-----lat avg|-----lat max|-overrun|----lat best|---lat
> worst
> RTD|       4.493|      12.861|      25.111|       0|       4.493|
> 25.111
> RTD|       9.057|      13.876|    1152.413|      37|       4.493|
> 1152.413
> RTD|      12.180|      13.755|     640.259|      53|       4.493|
> 1152.413
> RTD|      12.285|      13.924|     618.703|      70|       4.493|
> 1152.413
> ...
> 
> Please not I use CONFIG_HZ=250 as CONFIG_HZ=1000 freezes at boot time
> system with "clocksource tsc unstable" message.

Ok. Your processor likely halts the tsc when idle, or something. You
should try and see if there is no processor-specific kernel parameter to
prevent this behaviour, or alternatively try passing idle=poll.

You may also have issues with SMIs, see the TROUBLESHOOTING guide.

> 
> 
> If I set HPET:
> 
> CONFIG_HPET_TIMER=y
> CONFIG_HPET_EMULATE_RTC=y
> CONFIG_X86_UP_APIC=y
> CONFIG_X86_UP_IOAPIC=y
> CONFIG_X86_LOCAL_APIC=y
> CONFIG_X86_IO_APIC=y
> 
> I have a very strange message when starting latency:
> 
> Xenomai: native skin or CONFIG_XENO_OPT_PERVASIVE disabled.
> (modprobe xeno_native?)
> 
> Of course native skin is present and CONFIG_XENO_OPT_PERVASIVE enabled
> 
> CONFIG_XENO_SKIN_NATIVE=y
> CONFIG_XENO_OPT_PERVASIVE=y
> 
> Any idea?

Please show us the full .config.

-- 
                                          Gilles