On 03/06/2015 09:04 AM, Henning Rogge wrote: > [...] > > Second, we are seeing a huge amount of radar events on some nodes, but > not on a node on the same channel in the next room. What is the status > of the DFS detector in ath9k, is it reliable or is it still > "experimental". > Henning, the DFS detector on one hand still can be labeled as 'experimental' since it seems to be not used / tested all too much. On the other hand, our company got it DFS-ETSI certified for a ath9k based product - so it does what it was made for. As for the 'false' radar detections you observe: those are inherent for the detection method used. The ath9k's pulse detection engine reports anything that somewhat looks like a radar pulse - besides very rare cases where those were generated by real radar, most of them are EM-noise, WLAN traffic, other radio devices. Reality check: let two APs operate close to each other on adjacent DFS-channels, connect one station to one of them and generate continuous downstream traffic (e.g. 10Mbps). It will take only seconds until the other AP will detect a radar - simply because it is inevitable to spot some potential pattern within a lot of random pulses. If you performed the tests in a similar environment, your observation is what you have to expect. And unfortunately there is nothing to be done to prevent the false radar detections - rendering operation on DFS frequencies inapplicable under some environmental conditions. Cheers, Zefir -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
