On 09/12/2012 09:01 PM, Sven-Thorsten Dietrich wrote: > > On Sep 12, 2012, at 3:20 AM, Hartmut Behrens > <hartmut.behrens@xxxxxxxxx> wrote: > >> 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? > > > There are a lot of options that can be eliminated / optimized to > reduce memory footprint and overhead. One of these options is, maybe surprisingly, CONFIG_THUMB2_KERNEL. -- Gilles. -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
