On Tue, Jul 28, 2015 at 7:25 PM, Adrian Chadd <adrian@xxxxxxxxxxx> wrote: > So the values aren't "bad" on the 1043nd - they're in 1/2 or 1/4dB, > but there's no scalar quantity (ie, it's not in dBm.) The 1043nd > calibrates down to around -95 or so, which "sounds" like it's in dBm > but it isn't, and any similarity is just coincidence. Ok, then we'll ignore the 1043nd from now on. > It does sound like your AR9227 sees noise. can you fire up the > spectral analysis stuff to plot what the NIC is seeing? (yes, the > AR9287/AR9227 has spectral analysis mode, same as the AR9280, AR9285, > and >= AR9300.) I am assuming that "background" mode is what you want, see [0]. Thus I ran the following on my AR9227 device: # echo background > /sys/kernel/debug/ieee80211/phy1/ath9k/spectral_scan_ctl # echo trigger > /sys/kernel/debug/ieee80211/phy1/ath9k/spectral_scan_ctl # cat /sys/kernel/debug/ieee80211/phy1/ath9k/spectral_scan0 > /tmp/samples The result can be found here: [1]. Note that at this point no client was connected to my AP. My patch (from the initial mail) was applied - but that shouldn't have any effect on the spectral scan output (at least that's what I'm assuming). Just for documentation purposes - those are the NF values that I have seen a few seconds before getting the spectral scan data: # cat /sys/kernel/debug/ieee80211/phy1/ath9k/dump_nfcal Channel Noise Floor : -93 Chain | privNF | # Readings | NF Readings 0 -104 5 -109 -109 -109 -104 -104 1 -97 5 -97 -97 -97 -97 -97 Regards, Martin [0] https://wireless.wiki.kernel.org/en/users/drivers/ath9k/spectral_scan [1] https://dl.dropboxusercontent.com/u/26940713/tmp/spectral_out -- 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
