On Wed, Oct 22, 2014 at 03:57:53PM +0200, Daniel Lezcano wrote: > The size of the bucket is the bucket interval and represent the resolution > of the statistic model. Eg with a bucket interval of 1us, it leads us to > do statitics on all numbers, with of course a bad prediction because the > number of latencies is big. A big interval can give better statistics, > but can give us a misprediction as the interval is larger. > > Choosing the size of the bucket interval vs the idle sleep time is the > tradeoff to find. With a 200us bucket interval, the measurements show > we still have good predictions, less mispredictions and cover the idle > state target residency. >
For the record: The suggestion in DUS was to align the bucket sizes with the various break even times of the actual C states. I forgot who suggested this; it might have been Morten; but it seems to make sense. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
