Improving ARM7 platform performance with CONFIG_PREEMPT_RT

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Hi,

I have patched a 3.2 kernel for a OMAP compatible processor (ARM
Cortex A8) to be used on an Gumstix Overo with the CONFIG_PREEMPT_RT
patch.

I have noticed that the latency of the patched kernel on this platform
is <300usec (using cyclictest), similar to what is reported for the
ARM9 platforms at
https://rt.wiki.kernel.org/index.php/CONFIG_PREEMPT_RT_Patch

Is this the best performance that can be expected from ARM7/9 platforms?

Could it be improved by using different kernel config settings - e.g.
CONFIG_LATENCY_TRACE=n  -
https://rt.wiki.kernel.org/index.php/Cyclictest mentions that latency
tracing adds significant kernel overhead?
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