[MVMA] Q-tip: Short Guard Interval may be chosen in links over 5 miles.
Chuck Gelm
nc8q-mesh at gelm.net
Tue Oct 27 08:00:40 EDT 2020
Here is the rc_stats from one end of a 13.5 mile link.
root at NC8Q-MVHS-DARA:/sys/kernel/debug/ieee80211/phy0/netdev:wlan0/stations/48:8f:5a:25:30:26#
cat rc_stats
best ____________rate__________
________statistics________ _____last____ ______sum-of________
mode guard # rate [name idx airtime max_tp] [avg(tp) avg(prob)
sd(prob)] [retry|suc|att] [#success | #attempts]
HT20 LGI 1 MCS0 0 1477 4.8 4.8 100.0
0.0 3 0 0 5 5
HT20 LGI 1 MCS1 1 738 9.7 0.0 0.0
0.0 0 0 0 0 0
HT20 LGI 1 MCS2 2 492 14.6 0.0 0.0
0.0 0 0 0 0 0
HT20 LGI 1 MCS3 3 369 17.0 17.0 100.0
0.0 0 0 0 1 1
HT20 LGI 1 MCS4 4 246 24.4 24.4 100.0
0.0 0 0 0 1 1
HT20 LGI 1 MCS5 5 185 29.2 29.2 100.0
0.0 0 0 0 1 1
HT20 LGI 1 MCS6 6 164 31.7 31.7 100.0
0.0 0 0 0 1 1
HT20 LGI 1 C P MCS7 7 148 34.1 34.1 95.5
0.0 5 0 0 89 91
HT20 LGI 2 MCS8 10 738 9.7 0.0 0.0
0.0 0 0 0 0 0
HT20 LGI 2 MCS9 11 369 17.0 17.0 100.0
0.0 0 0 0 1 1
HT20 LGI 2 MCS10 12 246 24.4 24.4 100.0
0.0 0 0 0 1 1
HT20 LGI 2 MCS11 13 185 29.2 29.2 100.0
0.0 0 0 0 1 1
HT20 LGI 2 MCS12 14 123 36.6 34.1 82.8
0.0 6 0 0 85 89
HT20 LGI 2 MCS13 15 92 43.9 34.1 68.9
0.0 6 0 0 463 493
HT20 LGI 2 MCS14 16 82 46.3 12.2 24.8
0.0 6 0 0 95 130
HT20 LGI 2 MCS15 17 74 48.8 0.0 0.0
0.0 0 0 0 0 19
HT20 SGI 1 MCS0 30 1329 4.8 0.0 0.0
0.0 0 0 0 0 0
HT20 SGI 1 MCS1 31 665 9.7 0.0 0.0
0.0 0 0 0 0 0
HT20 SGI 1 MCS2 32 443 14.6 0.0 0.0
0.0 0 0 0 0 0
HT20 SGI 1 MCS3 33 332 19.5 19.5 100.0
0.0 0 0 0 1 1
HT20 SGI 1 MCS4 34 222 26.8 26.8 100.0
0.0 5 0 0 1 1
HT20 SGI 1 MCS5 35 166 31.7 31.7 100.0
0.0 0 0 0 1 1
HT20 SGI 1 D MCS6 36 148 34.1 34.1 90.4
0.0 5 0 0 3 4
HT20 SGI 1 MCS7 37 133 36.6 29.2 75.0
0.0 6 0 0 33 39
HT20 SGI 2 MCS8 40 665 9.7 0.0 0.0
0.0 0 0 0 0 0
HT20 SGI 2 MCS9 41 332 19.5 19.5 100.0
0.0 0 0 0 1 1
HT20 SGI 2 MCS10 42 222 26.8 26.8 100.0
0.0 0 0 0 1 1
HT20 SGI 2 MCS11 43 166 31.7 31.7 100.0
0.0 0 0 0 1 1
HT20 *SGI 2 B MCS12* 44 111 39.0 39.0 100.0
0.0 6 5 5 385 398 <-------------
HT20 SGI 2 MCS13 45 83 46.3 34.1 68.9
0.0 6 0 0 1641 1734
HT20 *SGI 2 A MCS14* 46 74 48.8 43.9 81.1
0.0 6 1 1 38 62 <-------------
HT20 SGI 2 MCS15 47 67 51.2 0.0 0.0
0.0 0 0 0 1 19
Total packet count:: ideal 2732 lookaround 119
Average # of aggregated frames per A-MPDU: 1.0
root at NC8Q-MVHS-DARA:/sys/kernel/debug/ieee80211/phy0/netdev:wlan0/stations/48:8f:5a:25:30:26#
Although it may be contrary to an expressed opinion of others, it is
possible that,
occasionally in a link over 5 miles, the Short Guard Interval may be the
primary selection.
( http://www.miamivalleymesh.com/videos/sgi.mp4 )
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