AcoSail/kernel_optimize_test
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wl1271: Optimize scan duration

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Currently then dwell times for each channel in scans is set to an overly
long value, and excessive number of probe-requests are transmitted on each
channel (for active scans.)

Based on testing, comparable results can be received with smaller dwell-time,
and, with fever probe-requests - in fact, reducing the number of probe-requests
to 2 seems to increase the number of found results.

Configure more optimal values for per channel dwell times. Comparison for the
different scan configurations (in my current office environment):

dwell-time 60000   3x probe-req == ~60 results
           40000   3x probe-req == ~50 results
           30000   3x probe-req == ~40 results

dwell-time 60000   2x probe-req == ~70 results
           40000   2x probe-req == ~60 results
           30000   2x probe-req == ~58 results

The above are results for a cumulative 3 scan run. For individual scans, the
number of results drop slightly more.

Signed-off-by: Juuso Oikarinen <juuso.oikarinen@nokia.com>
Reviewed-by: Teemu Paasikivi <ext-teemu.3.paasikivi@nokia.com>
Signed-off-by: Luciano Coelho <luciano.coelho@nokia.com>
This commit is contained in:
Juuso Oikarinen 2010-09-21 08:14:31 +02:00 committed by Luciano Coelho
parent 78abd32074
commit bea39d6a60
4 changed files with 60 additions and 9 deletions
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39
drivers/net/wireless/wl12xx/wl1271_conf.h
View File

@ -1016,6 +1016,44 @@ struct conf_roam_trigger_settings {
u8 avg_weight_snr_data;
};
struct conf_scan_settings {
/*
* The minimum time to wait on each channel for active scans
*
* Range: 0 - 65536 tu
*/
u16 min_dwell_time_active;
/*
* The maximum time to wait on each channel for active scans
*
* Range: 0 - 65536 tu
*/
u16 max_dwell_time_active;
/*
* The maximum time to wait on each channel for passive scans
*
* Range: 0 - 65536 tu
*/
u16 min_dwell_time_passive;
/*
* The maximum time to wait on each channel for passive scans
*
* Range: 0 - 65536 tu
*/
u16 max_dwell_time_passive;
/*
* Number of probe requests to transmit on each active scan channel
*
* Range: u8
*/
u16 num_probe_reqs;
};
struct conf_drv_settings {
struct conf_sg_settings sg;
struct conf_rx_settings rx;
@ -1024,6 +1062,7 @@ struct conf_drv_settings {
struct conf_itrim_settings itrim;
struct conf_pm_config_settings pm_config;
struct conf_roam_trigger_settings roam_trigger;
struct conf_scan_settings scan;
};
#endif

9
drivers/net/wireless/wl12xx/wl1271_main.c
View File

@ -232,7 +232,14 @@ static struct conf_drv_settings default_conf = {
.avg_weight_rssi_data = 10,
.avg_weight_snr_beacon = 20,
.avg_weight_snr_data = 10
}
},
.scan = {
.min_dwell_time_active = 7500,
.max_dwell_time_active = 30000,
.min_dwell_time_passive = 30000,
.max_dwell_time_passive = 60000,
.num_probe_reqs = 2,
},
};
static void __wl1271_op_remove_interface(struct wl1271 *wl);

18
drivers/net/wireless/wl12xx/wl1271_scan.c
View File

@ -64,6 +64,7 @@ static int wl1271_get_scan_channels(struct wl1271 *wl,
struct basic_scan_channel_params *channels,
enum ieee80211_band band, bool passive)
{
struct conf_scan_settings *c = &wl->conf.scan;
int i, j;
u32 flags;
@ -91,10 +92,17 @@ static int wl1271_get_scan_channels(struct wl1271 *wl,
wl1271_debug(DEBUG_SCAN, "beacon_found %d",
req->channels[i]->beacon_found);
channels[j].min_duration =
cpu_to_le32(WL1271_SCAN_CHAN_MIN_DURATION);
channels[j].max_duration =
cpu_to_le32(WL1271_SCAN_CHAN_MAX_DURATION);
if (!passive) {
channels[j].min_duration =
cpu_to_le32(c->min_dwell_time_active);
channels[j].max_duration =
cpu_to_le32(c->max_dwell_time_active);
} else {
channels[j].min_duration =
cpu_to_le32(c->min_dwell_time_passive);
channels[j].max_duration =
cpu_to_le32(c->max_dwell_time_passive);
}
channels[j].early_termination = 0;
channels[j].tx_power_att = req->channels[i]->max_power;
channels[j].channel = req->channels[i]->hw_value;
@ -151,7 +159,7 @@ static int wl1271_scan_send(struct wl1271 *wl, enum ieee80211_band band,
cmd->params.rx_filter_options =
cpu_to_le32(CFG_RX_PRSP_EN | CFG_RX_MGMT_EN | CFG_RX_BCN_EN);
cmd->params.n_probe_reqs = WL1271_SCAN_PROBE_REQS;
cmd->params.n_probe_reqs = wl->conf.scan.num_probe_reqs;
cmd->params.tx_rate = cpu_to_le32(basic_rate);
cmd->params.tid_trigger = 0;
cmd->params.scan_tag = WL1271_SCAN_DEFAULT_TAG;

3
drivers/net/wireless/wl12xx/wl1271_scan.h
View File

@ -40,11 +40,8 @@ void wl1271_scan_complete_work(struct work_struct *work);
#define WL1271_SCAN_OPT_ACTIVE 0
#define WL1271_SCAN_OPT_PASSIVE 1
#define WL1271_SCAN_OPT_PRIORITY_HIGH 4
#define WL1271_SCAN_CHAN_MIN_DURATION 30000 /* TU */
#define WL1271_SCAN_CHAN_MAX_DURATION 60000 /* TU */
#define WL1271_SCAN_BAND_2_4_GHZ 0
#define WL1271_SCAN_BAND_5_GHZ 1
#define WL1271_SCAN_PROBE_REQS 3
#define WL1271_SCAN_TIMEOUT 10000 /* msec */