Sean McGranaghan wrote:
Hello all,
I am configuring a new PC for Xenomai 2.1 with a 2.6.16 kernel. In the
past I have always used a vanilla kernel in the default configuration. I
was wondering what features are recommended to enable or disable in the
default kernel configuration? For example I know to enable the SMI
workaround if the chipset supports it.
What about SMP?
If you have a SMP, HT or multi-core box, Xenomai will support this too
(HT will introduce additional latency though). If not, well, it will
still support this, but at the expense of the usual performance
degradation of enforcing inter-CPU locks uselessly.
Kernel pre-emption?
No problem.
Power management ACPI/APM/frequency scaling?
Not all ACPI is bad, but you will need to check the options that you
really need and which don't hurt your setup. Frequency scaling is bad
for instance. However, you may want to enable ACPI only for the purpose
of enumerating multiple CPUs if you need to do so for booting (HT comes
to mind). APM is a no go.
Or, are all these irrelevant because Xenomai sits ahead of the kernel in
the interrupt pipeline?
This is unrelated. The pipeline only affects the dispatching of events
(e.g. interrupts, faults, special kernel events).
I had this thought because my new motherboard supports hyper-threading
and the vanilla kernel build includes SMP support.
Thanks,
Sean
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Philippe.
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