On 10/09/2012 08:51 PM, Raghavendra K T wrote: > Here is the summary: > We do get good benefit by increasing ple window. Though we don't > see good benefit for kernbench and sysbench, for ebizzy, we get huge > improvement for 1x scenario. (almost 2/3rd of ple disabled case). > > Let me know if you think we can increase the default ple_window > itself to 16k. >
I think so, there is no point running with untuned defaults. > > I can respin the whole series including this default ple_window change. It can come as a separate patch. > > I also have the perf kvm top result for both ebizzy and kernbench. > I think they are in expected lines now. > > Improvements > ================ > > 16 core PLE machine with 16 vcpu guest > > base = 3.6.0-rc5 + ple handler optimization patches > base_pleopt_16k = base + ple_window = 16k > base_pleopt_32k = base + ple_window = 32k > base_pleopt_nople = base + ple_gap = 0 > kernbench, hackbench, sysbench (time in sec lower is better) > ebizzy (rec/sec higher is better) > > % improvements w.r.t base (ple_window = 4k) > ---------------+---------------+-----------------+-------------------+ > |base_pleopt_16k| base_pleopt_32k | base_pleopt_nople | > ---------------+---------------+-----------------+-------------------+ > kernbench_1x | 0.42371 | 1.15164 | 0.09320 | > kernbench_2x | -1.40981 | -17.48282 | -570.77053 | > ---------------+---------------+-----------------+-------------------+ > sysbench_1x | -0.92367 | 0.24241 | -0.27027 | > sysbench_2x | -2.22706 |-0.30896 | -1.27573 | > sysbench_3x | -0.75509 | 0.09444 | -2.97756 | > ---------------+---------------+-----------------+-------------------+ > ebizzy_1x | 54.99976 | 67.29460 | 74.14076 | > ebizzy_2x | -8.83386 |-27.38403 | -96.22066 | > ---------------+---------------+-----------------+-------------------+ So it seems we want dynamic PLE windows. As soon as we enter overcommit we need to decrease the window. -- error compiling committee.c: too many arguments to function -- 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/
