Hi all, I had some strange results in my testing: Scenario: 2 nodes, with normal configuration, Ubuntu 12.4, kernel 3.x, HW: usb DWL-G122, wCompat 3.5, less noisy channel of all at the room, static nodes. Room with no other radios.
- Trasfers from node_a to node_b: "iperf -c node_b -u -b5M -t 60" achieve high lose rate med (33%), max BW: 3 Mbps "iperf -c node_b -u -b10M -t 60" achieve high lose rate med (25%), max BW: 6 Mbps "iperf -c node_b -u -b15M - t 60" achieve high lose rate med (21%), max BW: 8 Mbps if I check with "-i 10" I can see how the rate in each is going up and down (40% of range) - If I check "iw mesh0 station dump" I can see how the rate is changing around all the values from 54 to 5.5 , to 1..., i mean changing very fast for this enviroment, is like the negociation of nodes is not stable. During transfer the values are almost stable. Is it a nomal issue? - Now I fix the bitrate in all the nodes: iw dev mesh0 set bitrates legacy-2.4 X" where X is 6, 9, 18 ..54 With 1 Mbps I have iperf transfers of 0.6 Mbps without loses, and transfers of 1Mbps with 26% of loses. With 6 Mbps I have iperf transfers of 4 Mbps without loses, and transfers of 5Mbps with 7% of loses. With 18 Mbps I have iperf transfers of 15 Mbps, and here the TX limits the speed of trasmission to 8.8Mbps without loses. With 24 is similar to 18, I get a limitation in transmission (like b band to 11Mbps).RX is capable of reception all without loses. ¿Is any way to disable this limitation without HT modes? - So if I try in automatic rate mode to transfer 15Mbps I get a 21% of loses and 8Mbps of rate and if I select fix rate I get no loses and 9.3 Mbps of bit rate.... Is this normal? - If I fix to 6 Mbps the bit rate I can get 4.4 Mbps without loses, but if I fix to 5.5 I get 4Mbps with 35% of loses. If I select 12 Mbps all is working properly, but if I select 11 I achieve 30% of loses. Reading this, Could be possible that in any part of the code the system is using incorrectly the 5.5 instead of 6 or the 11 instead of 12 and it makes the lose rate to grow? Any other idea? cheers, David
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