On Fri, May 23, 2014 at 04:52:58PM +0100, Vincent Guittot wrote: > power_orig is only changed for system with a SMT sched_domain level in order > to > reflect the lower capacity of CPUs. Heterogenous system also have to reflect > an > original capacity that is different from the default value. > > Create a more generic function arch_scale_cpu_power that can be also used by > non SMT platform to set power_orig.
I did a quick test of the patch set with adjusting cpu_power on big.LITTLE (ARM TC2) to reflect the different compute capacities of the A15s and A7s. I ran the sysbench cpu benchmark with 5 threads with and without the patches applied, but with non-default cpu_powers. I didn't see any difference in the load-balance. Three tasks ended up on the two A15s and two tasks ended up on two of the three A7s leaving one unused in both cases. Using default cpu_power I get one task on each of the five cpus (best throughput). Unless I messed something up, it seems that setting cpu_power doesn't give me the best throughput with these patches applied. Have you done any tests on big.LITTLE? Morten -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/