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.
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