update - new hal flag to force a full chip reset

[Adrian Chadd]

Well I am still trying to establish what exactly is going on in noisy environments. The ar9160 doesn't behave this way.

A bit of background in case you feel like doing some digging..

The ANI patent doc explains what is going on. The ani code tweaks some parameters for weak signal detection, as well as what the desired signal size and level is. What I am not clear on yet is whether it's a signal sizing issue (ie, whether the ambient or bursty noise is falling within the signal level/size ani programs in) or whether the radio setup/calibration code is doing something wrong in 2.4ghz mode.

So it may be worthwhile reading the patent doc and ar5416 ani code, add some debugging tweaks and do some experiments with the parameters.

I've setup ath9k and it has similar behaviour. Sigh. :)


Adrian


Sent from my Palm Pre on AT&T
On Nov 6, 2011 11:19 AM, Lev Serebryakov <lev at freebsd.org> wrote: 

Hello, Adrian.

You wrote 6 ноября 2011 г., 22:15:19:



>>> Good luck, and thanks to everyone who has been testing my code out!

>>  Do you need any help? Maybe, running AP with additional debug output,

>> or something like this?

> Just dump the NF calibration results (sysctl dev.ath.X.hal.debug=0x8)

> and crank it up to say, 2 to 5 seconds (sysctl hw.ath.longcal=5).

> Let's see what the NF results are like.

   I've sent your these data, do you need more from exactly the same

 setup? :) I could make tests in the middle of working say, when

 environment isn't so noisy -- less APs are seen, and spee is better.



> I have a nasty feeling that the AR9280 series NICs report some rather

> high NF values. The values themselves aren't actually raw NF dBm,

> they're just a dB value - but the fact that it's so high is likely a

> symptom of the overall problem (which is likely that the signal levels

> are all configured wrong when faced with interference.)

  BTW, is here other ATH PCI chipsets with 802.11n? I've checked all

 Mirkotik Mini-PCI cards, for example, all of them are based on 9820,

 with different setups of RF part, some of them are single-band

 (2.4Ghz only), some of them are dual-band, some of them are dual-band

 and have amplifier, which adds some dBs of output, but chipset is the

 same. And the same with TP-Link cards, which could be purchased here

 (in Russia). It seems,



-- 

// Black Lion AKA Lev Serebryakov <lev at FreeBSD.org>