On 08/26/2011 11:49 PM, George Broz wrote:
>> Gilles Chanteperdrix <[email protected]> wrote on
> 08/26/2011 02:18:05 PM:
>> On 08/26/2011 10:42 PM, George Broz wrote:
>>> Hello,
>>>
>>> I'm experiencing very large overruns in the neighborhood of 10 to 50
>>> *milli-seconds* as reported by the Xenomai latency tool in user-task
> mode
>>> whenever the Linux OS is heavily loaded. Under lighter loads these are
> in
>>> the 30 to 70 micro-second (normal) range.
>>>
>>> My system is:
>>> - Linux 2.6.37.6 (32-bit), Ubuntu 10.10 distribution
>>> - Xenomai 2.5.6 using I-pipe patch adeos-ipipe-2.6.37.6-x86-2.9-02
>>> - Intel x86 Atom (dual-core) CPU D510 @ 1.66GHz
>>> - Emb. dev board from Intel (ICH8M ctrlr, Ethernet h/w for e1000e)
>>> - Xenomai configured w&w/o --enable-smp --enable-x86-tsc options
>>> - gcc version 4.4.5
>>>
>>> I've followed all of the recommendations for kernel configuration and
> have
>>> disabled CPU sleep features in the BIOS such as SpeedStep and
> C-States.
>>> Legacy USB has been disabled in the BIOS. Hyperthreading has also been
>
>>> disabled, although I don't think it matters.
>>
>> Have you tried to enable the SMI workaround?
>>
>> --
>> Gilles.
>>
>
> Yes - SMI workaround was enabled when the overruns were observed.
Could you try disabling CONFIG_SMP to see if you get the same behaviour,
and take a few traces?
If you processor supports 64 bits mode, could you try running a 64 bits
kernel?
--
Gilles.
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