Theo Veenker wrote:
> Theo Veenker wrote:
>
>>Philippe Gerum wrote:
>>
>>
>>>On Thu, 2007-03-15 at 10:48 +0100, Gilles Chanteperdrix wrote:
>>>
>>>
>>>>Theo Veenker wrote:
>>>>
>>>>
>>>>>Hi all,
>>>>>
>>>>>I'm preparing a Toshiba Satellite S1400-153E laptop for field work.
>>>>>It used to run redhat 9 + RTLinux, but now it runs Ubuntu 6.06 +
>>>>>Xenomai 2.3.
>>>>>
>>>>>Unfortunately the latency test shows high latencies (200..500us) at
>>>>>irregular intervals (5..20 sec) whereas the typical max latency is
>>>>>around 10 us. It doesn't seem to be related to any user action.
>>>>>
>>>>>I don't think this thing has SMI, anyway xenomai doesn't detect it.
>>>>>It also doesn't have a local APIC. What could be the cause of these
>>>>>high latencies?
>>>>
>>>>
>>>>APM ?
>>>>
>>>
>>>
>>>You may also want to check for USB-related issues as explained in the
>>>TROUBLESHOOTING file.
>>>
>>
>>I have APM, CPU Frequency Scaling and ACPI processor disabled in config.
>>I'll try to kill my USB stuff to see what happens.
>
>
> Unfortunately that didn't have any effect (apart from the mouse being
> disabled). I think I will try to work my way around it. I need 1ms
> accuracy, so as long as the pathological latencies that occur irregularly
> don't exeed 500us I should be OK.
These latencies are pathological. Are you running X-window ?
--
Gilles Chanteperdrix
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