On 03/26/2015 04:25 PM, Peter Zijlstra wrote: > On Fri, Feb 27, 2015 at 04:54:13PM +0100, Vincent Guittot wrote: >> Add the SD_PREFER_SIBLING flag for SMT level in order to ensure that >> the scheduler will put at least 1 task per core. >> >> Signed-off-by: Vincent Guittot <vincent.guit...@linaro.org> >> Reviewed-by: Preeti U. Murthy <pre...@linux.vnet.ibm.com> > > Preeti, what benchmarks did you use on power8 smt to verify performance? > > I'm seeing a slight but statistically significant regression on my > ivb-ep kernel build when I match the build concurrency to my core count. > > /me goes run (and install, its a fairly new box) more benches.
I use ebizzy benchmark to test performance regressions. But for this particular patch, I recollect that I did a code walk through to verify the correctness of the patch and not a performance test. Let me run ebizzy against this patch and verify. Regards Preeti U Murthy > -- 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/
