What does "iw wlan0 station dump" have to say? In particular, what is the ratio of TX packets to TX retries (or failures)?
I've generally seen 10% TX retries, compared to total TX packets, to be quite ideal. A substantially higher percentage of TX retries, especially if over 100%, usually indicates a problem with noise or interference. On Wed, Apr 30, 2014 at 6:57 PM, cmsv <[email protected]> wrote: > 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 > _______________________________________________ > > Battlemesh mailing list > > [email protected] > > http://ml.ninux.org/mailman/listinfo/battlemesh > > > > _______________________________________________ > openwrt-users mailing list > [email protected] > https://lists.openwrt.org/cgi-bin/mailman/listinfo/openwrt-users > > -- Ben West http://gowasabi.net [email protected] 314-246-9434
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