On 2013-02-19 11:37 -0800, Adrian Chadd wrote Georgiewskiy Yuriy:
AC>On 19 February 2013 11:11, Georgiewskiy Yuriy <bottleman@xxxxxxxxxx> wrote:
AC>
AC>>
AC>> hm, i have signal jumps too on some cards, but it's may be a hardware problem,
AC>> in one of my case this confirmed by manufacturer, then hi block 2.4 bands on it
AC>> where problem occurses, and continue sell it as 5Ggz only card. and i have NF
AC>> calibration jumps on this card too, it easy to se just enable calibration debug
AC>> (echo 0x00000008 > /sys/kernel/debug/ieee80211/phy0/ath9k/debug) and watch on
AC>> log with tail -f, you sould se something like this, may be periodicaly:
AC>>
AC>> 6.505180] ath: phy0: NF calibrated [ctl] [chain 0] is -68
AC>> 6.505185] ath: phy0: NF[0] (-68) > MAX (-97), correcting to MAX
AC>> 6.505188] ath: phy0: NF calibrated [ctl] [chain 1] is -80
AC>> 6.505191] ath: phy0: NF[1] (-80) > MAX (-97), correcting to MAX
AC>> 6.505194] ath: phy0: NF calibrated [ext] [chain 0] is -70
AC>> 6.505197] ath: phy0: NF[3] (-70) > MAX (-97), correcting to MAX
AC>> 6.505200] ath: phy0: NF calibrated [ext] [chain 1] is -80
AC>> 6.505204] ath: phy0: NF[4] (-80) > MAX (-97), correcting to MAX
AC>
AC>Yes. I've seen cards that do this. It's almost always due to badly
AC>placed components/tracks causing spurs / resonance to show up in the
AC>2GHz bands.
AC>It makes the NIC unusable in those modes.
but, there is some funny rssi processing sometimes:
common.h
#define ATH_EP_RND(x, mul) \
((((x)%(mul)) >= ((mul)/2)) ? ((x) + ((mul) - 1)) / (mul) : (x)/(mul))
recv.c
last_rssi = sc->last_rssi;
if (likely(last_rssi != ATH_RSSI_DUMMY_MARKER))
rssi = ATH_EP_RND(last_rssi, ATH_RSSI_EP_MULTIPLIER);
if (rssi < 0)
rssi = 0;
/* Update Beacon RSSI, this is used by ANI. */
ah->stats.avgbrssi = rssi;
may be i don't understand something, but looks strange.
C уважением With Best Regards
Георгиевский Юрий. Georgiewskiy Yuriy
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