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Date: Tue, 03 Dec 2013 13:31:43 +0100
From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
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Subject: Re: [Xenomai] latency spikes under load
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To: Kurijn Buys <kurijn.buys@open.ac.uk>
Cc: Xenomai@xenomai.org

On 12/03/2013 12:38 PM, Kurijn Buys wrote:
> Hardware: Pentium IV (lspci: 3,2GHz, i686, 32,64bit, 2 cpu's), 2Gb
> RAM Software: Ubuntu 10.04, kernel&patch 2.6.38.8, Xenomai 2.6.3

2.6.38 is rather old, could you try a more recent kernel like 3.8.13 to
see if you get the same problem?

> -I've set the SMI workaround by adding "xeno_hal.smi=-1" on the
> kernel command line
> (http://www.xenomai.org/documentation/xenomai-2.6/html/TROUBLESHOOTING/index.html#SMI),
> but maybe it makes a difference when it is set in the kernel config,
> as proposed here
> (http://www.xenomai.org/index.php/Configuring_x86_kernels), by
> setting the CONFIG_XENO_HW_SMI_WORKAROUND variable. However, I didn't
> find this variable in my kernel configuration...

Yes, the SMI workaround has changed from a compile-time option to a
run-time option, in order to avoid having to recompile the kernel to
change the option.

-- 
                                                                Gilles.