low throughputs with 14e4:4353

Rafał Miłecki zajec5 at gmail.com
Tue Nov 29 16:36:01 EST 2011

W dniu 29 listopada 2011 21:08 użytkownik Rafał Miłecki
<zajec5 at gmail.com> napisał:
> Hey Francesco,
> W dniu 29 listopada 2011 20:28 użytkownik
> <francesco.gringoli at ing.unibs.it> napisał:
>> Hi Rafal,
>> I bought some 43224 cards to begin playing with the firmware. Unfortunately I have problems with the throughput that is really low. Kernel is the latest from wireless git and firmware comes from broadcom-wl-5.100.138. I see that the transmitted power is low, I monitored it with a spectrum analyzer and it confirmed. A lot of packets are lost given the low power and minstrel always select 1Mb/s. When receiving with the 43224 in monitor mode, I see that it receives only a few of the frames that are received by a close 4318-based box: the reported power levels are low too. Please find attached all info about kernel/firmware and devices below.
>> I tried all the four cards I have and they behave the same: find a photo of one of them here
>>        http://www.ing.unibs.it/gringoli/foto.JPG
>> I tried the cards on a MacBook White, on an Intel Atom based motherboard, Intel Pentium, and AMD Sempron, and I always got very low throughput. The same cards, with the same antennas (everything untouched) but with brcmsmac work well and the spectrum analyzer reports "normal" emitted power levels.
> I'm fighting with my BCM43224 for last 2 days, I reproduced the
> problem with poor throughput. I already have some patches but nothing
> improving situation so far. If I discover anything, I promise to share
> :)

After trying some "next" patch while my development, my card started
working. I've managed to associate and authenticate. I hoped I've
implemented some lacking part, and found the cure.

Then I reverted all my patches and... card is still working :( Of
course I'm doing cold boot for every test.

I'll give it a rest and will try in next days again.


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