inline reply On 04/24/2014 05:27 AM, Nicolás Echániz wrote: > El 24/04/14 05:34, cmsv escribió: >> Recently i have experienced something quite usual to my experience and >> that was not happening previously in the same scenario where it is >> happening now. >> >> Here is the example: >> 2 nodes at with adhoc at 2.4ghz at a distance of 415 meters >> one uses an omni 15 dbi antenna at 18dbi and another 24 dbi grid at 16 dbi. >> >> This link was previously providing up to 21 mbit being 17 mbit a the >> lowest. Batman-adv TQ value was always around 230 being many times above >> 250. >> >> However this has recently changed the same link with 230~250 TQ and the >> same txpower is now outputting 1.93 Mbits/sec >> >> I have used iperf for bandwidth tests. Batman-adv version is 2013.4. >> Although i have considered several types of scenarios that can be >> causing this issue i have also tested against some which leaves me >> puzzled in regards to the presented TQ quality and dBm values as the >> nodes dBm are sometimes bad (ie: -80 ~ -90) >> >> One of the main questions is: shouldn't batman-adv TQ reflect or be >> influenced by dBm values ? How come with -90 dBm i get batman-adv to >> show me 230 TQ ? >> >> Also any feedback based on your experience regarding this type of >> scenario is welcome. This situation happened overnight without any >> access point new configurations or physical setup changes.
> what's the mcast_rate value?
>
> having 230~250 TQ on a -80/-90dBm link seems like you have a very low
> mcast_rate.
I have always used the driver default setup to decide the bitrate and
that worked up to a certain moment. Specifying it did not do much better
but today i found this message
ath: phy0: unsupported hw bitrate detected 0x1f using 1 Mbit
Currently:
wireless.@wifi-iface[0].mcast_rate=6000
and i tested with up to 36000
But i have also gotten the unsupported hw bitrate message without
setting mcast_rate
iwinfo reports:
Tx-Power: 19 dBm Link Quality: 36/70
Signal: -74 dBm Noise: -95 dBm
Bit Rate: 29.7 MBit/s
Encryption: WPA PSK (CCMP)
Type: nl80211 HW Mode(s): 802.11bgn
Hardware: unknown [Generic MAC80211]
TX power offset: unknown
Frequency offset: unknown
Supports VAPs: yes
iw reports:
Frequencies:
* 2412 MHz [1] (20.0 dBm)
* 2417 MHz [2] (20.0 dBm)
* 2422 MHz [3] (20.0 dBm)
* 2427 MHz [4] (20.0 dBm)
* 2432 MHz [5] (20.0 dBm)
* 2437 MHz [6] (20.0 dBm)
* 2442 MHz [7] (20.0 dBm)
* 2447 MHz [8] (20.0 dBm)
* 2452 MHz [9] (20.0 dBm)
* 2457 MHz [10] (20.0 dBm)
* 2462 MHz [11] (20.0 dBm)
* 2467 MHz [12] (20.0 dBm)
* 2472 MHz [13] (20.0 dBm)
* 2484 MHz [14] (disabled)
And o notice that i am at the moment unable to set 20dBm unless i
re-flash the device.
wireless.radio0.htmode=HT20
Bitrates (non-HT):
* 1.0 Mbps
* 2.0 Mbps (short preamble supported)
* 5.5 Mbps (short preamble supported)
* 11.0 Mbps (short preamble supported)
* 6.0 Mbps
* 9.0 Mbps
* 12.0 Mbps
* 18.0 Mbps
* 24.0 Mbps
* 36.0 Mbps
* 48.0 Mbps
* 54.0 Mbps
I also tested while removing HT functionality but without better results
Horst shows;
91% usage for 1M rate
3.4% usage for 6M rate
4% usage for 36M rate
another node shows me :
ath: phy0: unsupported hw bitrate detected 0x33 using 1 Mbit
Chips in at the moment in use: Atheros AR9130 rev 2 and Atheros AR9132 rev 2
So far it looks like a i have a bug according to atheros mailing lists
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