On 2013-02-20 00:14 +0530, Sujith Manoharan wrote Adrian Chadd:
SM>Adrian Chadd wrote:
SM>> It's easy enough to diagnose - just enable NF cal logging. Look at
SM>> what's being read back from the initial NF cal and what's being
SM>> written into the time-series average.
SM>
SM>I discussed this with Felix a while ago, a small log is here:
SM>http://pastebin.ca/2312828 (Note the jump in signal level).
SM>
SM>> It may be that something dumb is happening, like there's no
SM>> per-channel history, or the history from the wrong channel is being
SM>> used on a new channel.
SM>
SM>I am not sure about the dumb part, but ath9k doesn't have per-channel
SM>history or calibration data. :)
hm, i have signal jumps too on some cards, but it's may be a hardware problem,
in one of my case this confirmed by manufacturer, then hi block 2.4 bands on it
where problem occurses, and continue sell it as 5Ggz only card. and i have NF
calibration jumps on this card too, it easy to se just enable calibration debug
(echo 0x00000008 > /sys/kernel/debug/ieee80211/phy0/ath9k/debug) and watch on
log with tail -f, you sould se something like this, may be periodicaly:
6.505180] ath: phy0: NF calibrated [ctl] [chain 0] is -68
6.505185] ath: phy0: NF[0] (-68) > MAX (-97), correcting to MAX
6.505188] ath: phy0: NF calibrated [ctl] [chain 1] is -80
6.505191] ath: phy0: NF[1] (-80) > MAX (-97), correcting to MAX
6.505194] ath: phy0: NF calibrated [ext] [chain 0] is -70
6.505197] ath: phy0: NF[3] (-70) > MAX (-97), correcting to MAX
6.505200] ath: phy0: NF calibrated [ext] [chain 1] is -80
6.505204] ath: phy0: NF[4] (-80) > MAX (-97), correcting to MAX
and for example log from normal card:
[61255.118534] ath: phy0: NF calibrated [ctl] [chain 1] is -110
[61255.118544] ath: phy0: NF calibrated [ext] [chain 0] is -108
[61255.118553] ath: phy0: NF calibrated [ext] [chain 1] is -110
[61285.187275] ath: phy0: NF calibrated [ctl] [chain 0] is -109
[61285.187288] ath: phy0: NF calibrated [ctl] [chain 1] is -110
[61285.187297] ath: phy0: NF calibrated [ext] [chain 0] is -108
C уважением With Best Regards
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