slow connection

[Rafał Miłecki]

On 31 October 2014 23:41, Evgeniy Dushistov <dushistov at mail.ru> wrote:
> On Fri, Oct 31, 2014 at 09:12:39PM +0100, Rafał Miłecki wrote:
>> > So it is 3.18 Mbit/s vs 71.57 MBit/s under the same conditions,
>> > and the only difference is OS.
>> >
>> > Any hints, how to speedup connection under linux?
>>
>> We have some improvements for HT-PHY (BCM4331) in 3.18-rc1 (and
>> newer). Could you try it?
>>
>> b43 is still limited to 802.11g speeds, but I hope it will be better
>> than 3.18 Mb/s.
>>
>
> I got:
>   % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
>                                  Dload  Upload   Total   Spent    Left  Speed
> 100 2147M  100 2147M    0     0  2246k      0  0:16:18  0:16:18 --:--:-- 1842k
>
> real    16m18.774s
> user    0m27.340s
> sys     0m36.350s
>
> This is ~ 17.55Mbit/s for file transfer.
> What is much, much better. Thank you.
>
> Are these changes(3.16 [slow b43] vs 3.18 [fast b43]) located
> in drivers/net/wireless/b43?
> I would like to port them(changes) to my 3.16 kernel.

You may also look at drivers/ssb. Anyway, there is already a project
of backporting drivers, see:
https://backports.wiki.kernel.org/index.php/Main_Page


> By the way, during test connection was hang,
> and I can not ping any machine outside of my notebook.
>
> I rmmod/modprobe b43, restart wpa_supplicant/dhcpcd
> and all back to normal.
> And after restart I was unable to reproduce it(bug).
> dmesg also show nothing. Any hints how to debug such
> kind of issues, if I see it again?

I'm afraid not. You would need to hack driver to display info about
interrupts. Then see if there are any packets appearing or not, etc.

-- 
Rafał