AP performance (again): txpower regulation

[Lev Serebryakov]

Hello, Adrian.
You wrote 9 сентября 2011 г., 19:37:57:

> Look at all of those OFDM errors. That's a big, big part of your problem.
  Yep. I've been almost sure, that this is not normal to see such big
 numbers here.

> It's possible that there's some problem with the driver code and it's
> somehow setting up the RX side of your NIC incorrectly, causing lots
> of those OFDM errors.
> But it's also very likely you've just got a lot of noise in your local
> environment.
   Interesting question, is it possible to measure noise without
spending $100K on special hardware?
   And, is it possible, that cause of these errors is that card is
broken? Overheated some time ago, for example -- case of my AP is not
very well ventilated, unfortunately, it is Soekris net5501 in its
standard case and it is very hot sometimes.

> You could try disabling ANI (sysctl dev.ath.0.intmit=0) and see if
> things behave better/worse. You won't get OFDM/CCK error counts
> though, so don't assume "0" for those counts magically means they went
> away.
  Stable 36M from athstat and 9-10Mbit UDP from client to server.
Changing this sysctl back and forth doesn't affect bandwidth.

  BTW, it seems, that problems is (partially) with noise in
environment -- speed vary from day to day...

> Finally, if you/someone sends me one of those NICs, I can try using it
> here and see how it behaves. :)
  It seems, they are discounted :( I could not find any in-stock.

-- 
// Black Lion AKA Lev Serebryakov <lev at serebryakov.spb.ru>