AR9280 and noisy environments, please test

Fri Nov 4 12:34:23 UTC 2011

Hello, Adrian.
You wrote 3 ноября 2011 г., 7:17:06:

> What I'd like you guys to try:
> * update if_ath_tx!
  Done :)

  Here is preliminary results of UDP iperf.

Wired Server -> Notebook (AP SENDS):
[1928]  1.0- 2.0 sec   914 KBytes  7.49 Mbits/sec  2.509 ms 7934/ 8571 (93%)
[1928]  2.0- 3.0 sec   909 KBytes  7.44 Mbits/sec  2.572 ms 7874/ 8507 (93%)
[1928]  3.0- 4.0 sec   899 KBytes  7.36 Mbits/sec  2.607 ms 7868/ 8494 (93%)
[1928]  4.0- 5.0 sec   903 KBytes  7.40 Mbits/sec  2.855 ms 7873/ 8502 (93%)
[1928]  5.0- 6.0 sec   904 KBytes  7.41 Mbits/sec  2.684 ms 8056/ 8686 (93%)
[1928]  6.0- 7.0 sec   906 KBytes  7.42 Mbits/sec  2.476 ms 7844/ 8475 (93%)
[1928]  7.0- 8.0 sec   913 KBytes  7.48 Mbits/sec  2.692 ms 7950/ 8586 (93%)
[1928]  8.0- 9.0 sec   887 KBytes  7.27 Mbits/sec  2.951 ms 7723/ 8341 (93%)
[1928]  9.0-10.0 sec   909 KBytes  7.44 Mbits/sec  2.722 ms 8099/ 8732 (93%)
[1928]  0.0-10.9 sec  9.65 MBytes  7.42 Mbits/sec  3.078 ms 78580/85388 (92%)

Notebook -> Wired server (AP RECEIVES):
[  4]  0.0- 1.0 sec   713 KBytes  5.84 Mbits/sec   9.225 ms    0/  497 (0%)
[  4]  1.0- 2.0 sec  1.66 MBytes  13.9 Mbits/sec   0.658 ms    0/ 1181 (0%)
[  4]  2.0- 3.0 sec  1.80 MBytes  15.1 Mbits/sec   2.401 ms    0/ 1282 (0%)
[  4]  3.0- 4.0 sec  1.80 MBytes  15.1 Mbits/sec   1.062 ms    0/ 1283 (0%)
[  4]  4.0- 5.0 sec  2.00 MBytes  16.8 Mbits/sec   0.664 ms    0/ 1430 (0%)
[  4]  5.0- 6.0 sec  1.33 MBytes  11.2 Mbits/sec   8.788 ms    0/  952 (0%)
[  4]  6.0- 7.0 sec  1.52 MBytes  12.7 Mbits/sec   3.875 ms    0/ 1081 (0%)
[  4]  7.0- 8.0 sec   996 KBytes  8.16 Mbits/sec   8.685 ms    0/  694 (0%)
[  4]  8.0- 9.0 sec  1.19 MBytes  9.98 Mbits/sec   1.565 ms    0/  849 (0%)
[  4]  9.0-10.0 sec  1.27 MBytes  10.7 Mbits/sec   1.653 ms    0/  906 (0%)
[  4]  0.0-10.0 sec  14.3 MBytes  11.9 Mbits/sec   8.195 ms    0/10172 (0%)

> * run the ar9280 in hostap or STA mode, it doesn't matter what, but
> enable NF and ANI debugging:
>   # sysctl dev.ath.X.hal.debug=0x28
> * let it run for a couple of minutes, so it gets a couple of NF
> calibrations (which occur every 30 seconds) and then report that to
> me.
  Done. And iperf is tunning 90 seconds in one direction and 180
 seconds in other. It is "ath-debug-default.log.xz"
 BTW, here are some seconds (burst of 7-10 seconds) when WiFi shows
 zero speed, and after that, speed goes up! Like "7Mbit/s sending for
 1 minute, 10 seconds without traffic, 24Mbit/s sends for antother 2
 minutes"

> What you'll likely see is:

> * ANI goes bezerk with OFDM/CCK errors, and tries bumping up some
> things (spur immunity, firstep);
> * the NF values calibrated are either crazy looking (higher than -80),
> or chain 0 / chain 1 values are wildly mismatching;

> Then, try changing the longcal value from 30 to 1, and email me two or
> so minutes of logging output.

> Finally, set the CCA threshold to something manual, and rerun tests
> for a couple minutes:
> # sysctl dev.ath.X.config.cca=-85
  Done. And iperf is tunning 90 seconds in one direction and 180
  seconds in other. It is "ath-debug-cca-85.log.xz"
  Speed drops significantly in both directions (to 4-5Mbit/s) :(

  And here are output of "sysctl dev.ath.0.sample_stats" after all
 these experiments.

  And here are my config:
> ifconfig wlan0
wlan0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
        ether f4:ec:38:a3:10:6d
        inet 192.168.135.1 netmask 0xffffff00 broadcast 192.168.135.255
        inet6 fe80::f6ec:38ff:fea3:106d%wlan0 prefixlen 64 scopeid 0xc
        inet6 2001:470:923f:2::1 prefixlen 64
        nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
        media: IEEE 802.11 Wireless Ethernet autoselect mode 11ng <hostap>
        status: running
        ssid home.serebryakov.spb.ru channel 9 (2452 MHz 11g ht/20) bssid f4:ec:38:a3:10:6d
        regdomain ROW country RU indoor ecm authmode WPA2/802.11i
        privacy MIXED deftxkey 3 AES-CCM 2:128-bit AES-CCM 3:128-bit
        txpower 30 scanvalid 60 protmode CTS -ampdutx ampdurx ampdulimit 64k
        ampdudensity 8 shortgi wme burst dtimperiod 1 -dfs
> ifconfig wlan0 list sta
ADDR               AID CHAN RATE RSSI IDLE  TXSEQ  RXSEQ CAPS FLAG
00:18:de:08:e8:1d    1    9  36M 20.5    0  31527  24464 EPS  AQE     RSN WME
> grep ath0 /var/run/dmesg.boot
ath0: <Atheros 9280> mem 0xa0060000-0xa006ffff irq 15 at device 17.0 on pci0
ath0: [HT] enabling HT modes
ath0: [HT] 2 RX streams; 2 TX streams
ath0: AR9280 mac 128.2 RF5133 phy 13.0
>
-- 
// Black Lion AKA Lev Serebryakov <lev at FreeBSD.org>
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