ath_rate/sample/sample.c

248 pick_sample_rate(struct sample_softc *ssc , struct ath_node *an,
308 		if (sn->stats[size_bin][rix].successive_failures > ssc->max_successive_failures &&
309 		    ticks - sn->stats[size_bin][rix].last_tx < ssc->stale_failure_timeout) {
490 	struct sample_softc *ssc = ATH_SOFTC_SAMPLE(sc);
528 	if (sn->sample_tt[size_bin] < average_tx_time * (sn->packets_since_sample[size_bin]*ssc->sample_rate/100)) {
529 		rix = pick_sample_rate(ssc, an, rt, size_bin);
562 		} else if (ticks - ssc->min_switch > sn->ticks_since_switch[size_bin]) {
567 			    __func__, ticks - ssc->min_switch, sn->ticks_since_switch[size_bin]);
723 	struct sample_softc *ssc = ATH_SOFTC_SAMPLE(sc);
762 	if (sn->stats[size_bin][rix0].total_packets < ssc->smoothing_minpackets) {
770 			((sn->stats[size_bin][rix0].average_tx_time * ssc->smoothing_rate) +
771 			 (tt * (100 - ssc->smoothing_rate))) / 100;
813 	    ssc->smoothing_minpackets) {
821 			((sn->stats[size_bin][rix0].ewma_pct * ssc->smoothing_rate) +
822 			 (pct * (100 - ssc->smoothing_rate))) / 100;
1318 	struct sample_softc *ssc = arg1;
1321 	rate = ssc->smoothing_rate;
1327 	ssc->smoothing_rate = rate;
1328 	ssc->smoothing_minpackets = 100 / (100 - rate);
1335 	struct sample_softc *ssc = arg1;
1338 	rate = ssc->sample_rate;
1344 	ssc->sample_rate = rate;
1349 ath_rate_sysctlattach(struct ath_softc *sc, struct sample_softc *ssc)
1355 	    "smoothing_rate", CTLTYPE_INT | CTLFLAG_RW, ssc, 0,
1359 	    "sample_rate", CTLTYPE_INT | CTLFLAG_RW, ssc, 0,
1371 	struct sample_softc *ssc;
1373 	ssc = malloc(sizeof(struct sample_softc), M_DEVBUF, M_NOWAIT|M_ZERO);
1374 	if (ssc == NULL)
1376 	ssc->arc.arc_space = sizeof(struct sample_node);
1377 	ssc->smoothing_rate = 75;		/* ewma percentage ([0..99]) */
1378 	ssc->smoothing_minpackets = 100 / (100 - ssc->smoothing_rate);
1379 	ssc->sample_rate = 10;			/* %time to try diff tx rates */
1380 	ssc->max_successive_failures = 3;	/* threshold for rate sampling*/
1381 	ssc->stale_failure_timeout = 10 * hz;	/* 10 seconds */
1382 	ssc->min_switch = hz;			/* 1 second */
1383 	ath_rate_sysctlattach(sc, ssc);
1384 	return &ssc->arc;
1390 	struct sample_softc *ssc = (struct sample_softc *) arc;
1392 	free(ssc, M_DEVBUF);