[Xenomai-help] Compaq nc6120 timer frequency

[Xenomai-help] Compaq nc6120 timer frequency

[Cedric Herreman]

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Hello,

I have installed xenomai on my Compaq nc6120 portable. Everything seems to be working OK. There is only one issue :

When i create a periodic task, it runs with a higher period than expected (60 x). I have the impression that the ratio "ticks per ns" is not correct. The latencies are acceptable.

I am running xenomai-2.1.2 on a 2.6.16.20 kernel. 
 
 cat /proc/xenomai/timer:
 status=oneshot:setup=51:tickval=1:jiffies=42919216297
 
 cat /proc/xenomai/latency:
 2699
 
 cat /proc/cpufreq:
           minimum CPU frequency  -  maximum CPU frequency  -  policy
 CPU  0       800000 kHz ( 50 %)  -    1600000 kHz (100 %)  -  userspace
 
 cat /proc/cpuinfo:
 processor    : 0
 vendor_id    : GenuineIntel
 cpu family    : 6
 model        : 13
 model name    : Intel(R) Pentium(R) M processor 1.60GHz
 stepping    : 8
 cpu MHz        : 798.419
 cache size    : 2048 KB
 fdiv_bug    : no
 hlt_bug        : no
 f00f_bug    : no
 coma_bug    : no
 fpu        : yes
 fpu_exception    : yes
 cpuid level    : 2
 wp        : yes
 flags        : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat clflush dts acpi mmx fxsr sse sse2 ss tm pbe nx est tm2
 bogomips    : 1576.96

Can anyone give me a hint on this problem ? 
 
 Thanks,

Cedric.



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Re: [Xenomai-help] Compaq nc6120 timer frequency

[Gilles Chanteperdrix]

Cedric Herreman wrote:
 > Can anyone give me a hint on this problem ? 

disable cpufreq.

-- 


					    Gilles Chanteperdrix.

Re: [Xenomai-help] Compaq nc6120 timer frequency

[Gilles Chanteperdrix]

Cedric Herreman wrote:
 > I disabled CPU Frequency Scaling and recompiled kernel + modules, but the problem remains.
 >  

If it is not done, please also disable CONFIG_ACPI_PROCESSOR.

Do you observe the same behaviour with the latency test ? If yes, could
you send us your .config, if not, could you show us a minimal piece of
code which has a problem ?

-- 


					    Gilles Chanteperdrix.

Re: [Xenomai-help] Compaq nc6120 timer frequency

[Cedric Herreman]

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Gilles,
 
 Disabling ACPI fixed the problem. Thanks for your help.
 
 Cedric.

Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org> wrote: Cedric Herreman wrote:
 > I disabled CPU Frequency Scaling and recompiled kernel + modules, but the problem remains.
 >  

If it is not done, please also disable CONFIG_ACPI_PROCESSOR.

Do you observe the same behaviour with the latency test ? If yes, could
you send us your .config, if not, could you show us a minimal piece of
code which has a problem ?

-- 


         Gilles Chanteperdrix.


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