[ath9k-devel] Weird Atheros 9485 http connecting problems

[Arkh4mKn1ght <arkh4mkn1ght@gmail.com>]

Yeah i didnt try to say that the culprit was firefox, it was just an 
observation i made so i thought maybe the problem
was related somehow to a limit or kernel parameter. Thanks for the tip 
about the TCP receiver buffer size, but first
i have tweaked these 2 parameters that were in default low:

net.core.somaxconn = 128
net.ipv4.tcp_max_syn_backlog = 128

I have both raised them to 2048.
I did this because monitoring my laptop with netstat i found that the 
number of connections including
TCP, UDP, and unix domain sockets DGRAM and STREAM were about 700 at a 
given time.
I will see if this solves the issue. if not i will try your suggestion

Greetings
Oskar


On 05/27/2014 08:43 AM, Rajkumar Manoharan wrote:
> On Mon, May 26, 2014 at 03:06:57PM -0300, Oskar Kossuth wrote:
>> Update:
>>
>> I did some investigation after the problem with the atheros wifi card
>> happened again and i found something odd.
>> The firefox process was consuming a lot of CPU, while the problem was
>> ongoing, and the CPU usage decreased to normal levels after i stopped trying
>> to load a website, and increased a lot after i tried to load the website
>> again.
>>
> Oskar,
>
> your issue is not related to firefox as earlier you had mentioned that
> with lynx also the problem occurs. isn't it?
>> PS: I tested using the eth0 realtek adapter of my laptop and disabled
>> wireless. The problem appeared also in this case.
>>
> So it is not wireless or ethernet issue. From you earlier sniffer
> capture, I do see lot of TCP connection resets with window size 0.
> Even TCP 3-way handshake also terminated in most of the cases. Can you
> tune TCP receive buffer size.
>
> http://www.cyberciti.biz/faq/linux-tcp-tuning/
>
> -Rajkumar
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