func (srs *SRStatus) updateXferRate(sz int64, duration time.Duration) {
	if sz > minLargeObjSize {
		srs.XferRateLrg.addSize(sz, duration)
	} else {
		srs.XferRateSml.addSize(sz, duration)
	}
}

func newSRStats() *SRStats {
	s := SRStats{
		M:               make(map[string]*SRStatus),
		movingAvgTicker: time.NewTicker(time.Second * 2),
	}
	go s.trackEWMA()
	return &s
}

func (sr *SRStats) trackEWMA() {