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bcrawfo2
newbie
Topic Author
Posts: 25
Joined: Thu May 08, 2008 7:12 pm

802.11n AP client btest results dropping out when sending

Tue Sep 21, 2010 5:56 pm

I have a new RB433AH and MT R52nM card.
My client registers just fine and gets decent receive btest results of 64 Mbps for as long as I want. If I stop that test and do a send btest, I peak at 10Mbps for a few seconds...then it goes down to 0, then back up to 10...then back to 0. During this up/down time, I have successful pings...then they stop when test is at 0...then they are successful again.

My config is below.
Also...of note...if I enable the 54Mbps rate, my btest result actually goes down. Same if I enable MCS 5,6, or 7.
Here is my registration table. The first is when doing a "receive" test...the second when doing a "send" test.
0 interface=wlan1 mac-address=00:23:14:D4:EB:84 ap=no wds=no rx-rate="48.0Mbps" tx-rate="90.0Mbps" packets=637946,134657 bytes=962757824,201128350
frames=637946,134662 frame-bytes=964033724,200320920 hw-frames=662017,134745 hw-frame-bytes=984907094,205720028 tx-frames-timed-out=0 uptime=11m47s
last-activity=0ms signal-strength=-73dBm@48Mbps signal-to-noise=40dB
strength-at-rates=-71dBm@6Mbps 7s870ms,-73dBm@9Mbps 1s200ms,-72dBm@12Mbps 1m26s870ms,-71dBm@18Mbps 10m45s990ms,-70dBm@24Mbps 1m34s260ms,-71dBm@36Mbps 3s110ms,-
73dBm@48Mbps 100ms,-70dBm@54Mbps 11m46s790ms
tx-ccq=100% p-throughput=74325 distance=1 last-ip=192.168.111.254 802.1x-port-enabled=yes authentication-type=wpa2-psk encryption=aes-ccm
group-encryption=aes-ccm wmm-enabled=yes
[admin@MikroTik] /interface wireless registration-table> print stats
0 interface=wlan1 mac-address=00:23:14:D4:EB:84 ap=no wds=no rx-rate="48.0Mbps" tx-rate="6.0Mbps" packets=665351,151202 bytes=1003963836,225927860
frames=665351,151207 frame-bytes=1005294546,225021160 hw-frames=691668,151290 hw-frame-bytes=1027278416,231082068 tx-frames-timed-out=0 uptime=12m40s
last-activity=840ms signal-strength=-70dBm@48Mbps signal-to-noise=43dB
strength-at-rates=-71dBm@6Mbps 1s320ms,-69dBm@9Mbps 1s300ms,-72dBm@12Mbps 2m19s920ms,-71dBm@18Mbps 11m39s40ms,-70dBm@24Mbps 2m27s310ms,-71dBm@36Mbps 1s180ms,-
70dBm@48Mbps 840ms,-70dBm@54Mbps 12m39s840ms
tx-ccq=48% p-throughput=5535 distance=1 last-ip=192.168.111.254 802.1x-port-enabled=yes authentication-type=wpa2-psk encryption=aes-ccm group-encryption=aes-ccm
wmm-enabled=yes
[admin@MikroTik] /interface wireless registration-table>


[admin@MikroTik] /interface wireless> print advanced
Flags: X - disabled, R - running
0 R name="wlan1" mtu=1500 mac-address=00:0C:42:64:BE:60 arp=enabled disable-running-check=no interface-type=Atheros 11N radio-name="000C4264BE60" mode=ap-bridge
ssid="mt-n" area="" frequency-mode=regulatory-domain country=united states antenna-gain=0 frequency=5180 band=5ghz-onlyn channel-width=20mhz scan-list=default
wireless-protocol=802.11 rate-set=configured supported-rates-b=1Mbps,2Mbps,5.5Mbps,11Mbps supported-rates-a/g=6Mbps,9Mbps,12Mbps,18Mbps,24Mbps,36Mbps,48Mbps
basic-rates-b=1Mbps basic-rates-a/g=6Mbps max-station-count=2007 distance=dynamic tx-power-mode=default noise-floor-threshold=default
noise-floor-offset=default periodic-calibration=default periodic-calibration-interval=60 dfs-mode=none wds-mode=disabled wds-default-bridge=none
wds-default-cost=100 wds-cost-range=50-150 wds-ignore-ssid=no update-stats-interval=disabled default-authentication=yes default-forwarding=yes
default-ap-tx-limit=0 default-client-tx-limit=0 proprietary-extensions=post-2.9.25 wmm-support=disabled hide-ssid=no security-profile=secure
disconnect-timeout=3s on-fail-retry-time=100ms preamble-mode=both compression=no allow-sharedkey=no station-bridge-clone-mac=00:00:00:00:00:00
ht-ampdu-priorities=0 ht-guard-interval=any ht-extension-channel=above-control
ht-supported-mcs=mcs-0,mcs-1,mcs-2,mcs-3,mcs-4,mcs-8,mcs-9,mcs-10,mcs-11,mcs-12,mcs-13,mcs-14,mcs-15 ht-basic-mcs="" ht-txchains=0 ht-rxchains=0
ht-amsdu-limit=8192 ht-amsdu-threshold=8192 tdma-debug=0 tdma-override-rate=disabled tdma-override-size=0 tdma-period-size=2 nv2-queue-count=2 nv2-qos=default
nv2-cell-radius=30 hw-retries=4 frame-lifetime=0 adaptive-noise-immunity=none hw-fragmentation-threshold=disabled hw-protection-mode=none
hw-protection-threshold=0 frequency-offset=0



My client is a Lenovo T410 with a factory Intel AGN card. Doesn't get much more mainstream than that.

Thanks for any input.
Scott
 
bcrawfo2
newbie
Topic Author
Posts: 25
Joined: Thu May 08, 2008 7:12 pm

Re: 802.11n AP client btest results dropping out when sendin

Wed Sep 22, 2010 5:20 am

The dropping turned out to be a driver problem.
I'm doing some more testing tonight and in the morning, but right now I have 64Mbps down and 3.5 up.

Still don't get why MCS 5, 6, and 7 make it worse.
 
syd
just joined
Posts: 3
Joined: Sun Nov 14, 2010 4:05 pm

Re: 802.11n AP client btest results dropping out when sendin

Sun Nov 14, 2010 4:22 pm

I have the same problem with PtP connection! On one side I have r52n (bought in January 2010), on another side is r52nM (bought about August or September 2010), platforms (433AH) and OS (5rc3, on 4.xx it's even worse) are the same.

My way was to buy cards from the same producer to haven't problems compatibility between cards or between card and platform. So this is what we get :-|

Is anybody solved this problem in other way that waiting for new drivers or sth?

Regards
syd

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