[ath9k-devel] Weird Atheros 9485 http connecting problems

[Oskar Kossuth <okossuth@gmail.com>]

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.
I did an strace of the firefox process and i found lots and lots of 
errors like these:

recvfrom(4, 0x7f9fd6cd8074, 4096, 0, 0, 0) = -1 EAGAIN (Resource 
temporarily unavailable)
recvfrom(4, 0x7f9fd6cd8074, 4096, 0, 0, 0) = -1 EAGAIN (Resource 
temporarily unavailable)
recvfrom(4, 0x7f9fd6cd8074, 4096, 0, 0, 0) = -1 EAGAIN (Resource 
temporarily unavailable)
recvfrom(4, 0x7f9fd6cd8074, 4096, 0, 0, 0) = -1 EAGAIN (Resource 
temporarily unavailable)

I checked the file descriptor 4 for the firefox process 7265:

[root at localhost incsub]# cd /proc/7265/fd
[root at localhost fd]# ls -l 4
lrwx------ 1 oskar oskar 64 May 26 12:28 4 -> socket:[1868342]
[root at localhost fd]# netstat -an | grep 1868342
unix  3      [ ]         STREAM     CONNECTED     1868342
[root at localhost fd]#

So maybe there is some kind of issue with a limit, a sysctl kernel 
parameter or something like that?
Any ideas?

Thanks

PS: I tested using the eth0 realtek adapter of my laptop and disabled 
wireless. The problem appeared also in this case.

On 05/21/2014 05:10 PM, Adrian Chadd wrote:
> hi,
>
> Hm. You're hibernating? That may explain why the thing is return
> 0xdeadc0de during register reads. Maybe the MAC isn't fully waking up
> after a resume?
>
>
> -a
>
>
> On 21 May 2014 08:10, Arkh4mKn1ght <arkh4mkn1ght@gmail.com> wrote:
>> Hi rajkumar
>>
>> I dont know if this only happens when resuming from hibernate, it was just a
>> thought that ocurred to me today. I will test again without hibernating to
>> see if this happens again.
>> I dont use any firewall on the laptop, so iptables -F is pointless.
>> Ping latency times are good when the problem is ongoing.
>> I will take a sniffer capture and send it back to you.
>>
>> Thanks for your help
>>
>> Oskar
>>
>>
>> On 05/21/2014 11:59 AM, Rajkumar Manoharan wrote:
>>> On Wed, May 21, 2014 at 11:37:36AM -0300, Arkh4mKn1ght wrote:
>>>> Ok i tried the patch but the issue happened again :(
>>>>
>>>> After resuming my laptop from hibernation i saw in
>>>> /var/log/kernel/errors.log these messages again:
>>>>
>>>> May 21 09:20:10 localhost kernel: mei_me 0000:00:16.0: suspend
>>>> May 21 09:20:10 localhost kernel: ath: phy1: RX failed to go idle in 10
>>>> ms
>>>> RXSM=0xdeadbeef
>>>> May 21 09:20:10 localhost kernel: ath: phy1: DMA failed to stop in 10 ms
>>>> AR_CR=0xdeadbeef AR_DIAG_SW=0xdeadbeef DMADBG_7=0xdeadbeef
>>>> May 21 09:20:11 localhost kernel: dpm_run_callback():
>>>> usb_dev_restore+0x0/0x20 [usbcore] returns -107
>>>> May 21 09:20:11 localhost kernel: PM: Device 1-1 failed to restore async:
>>>> error -107
>>>>
>>>> ASPM was disabled on root complex and atheros card.powersave was off.
>>>> After 1 hour and 10 minutes of those messages that problem arise. I have
>>>> noticed that the problem arises always after some time of resuming the
>>>> laptop from hibernation.
>>>>
>>>> Its really odd, because when it does happen, browsing the web is
>>>> painfully
>>>> slow with the "connecting to domain.com..." message in the browser status
>>>> bar... it does load the website but after some minutes..
>>>> Meanwhile at the same time if i try to download a torrent using a
>>>> bittorrent
>>>> client i can do it without problems at full speed. If i pause the
>>>> torrent,
>>>> browsing websites still behaves slowly until i reboot the laptop.
>>>>
>>>> At first i thought that i have a defective atheros card, but why i can
>>>> download torrents at full speed when this problem arises?
>>>> What options do i have now? i have tested all combinations of ASPM
>>>> enabled/disabled and powersave on/off.
>>>>
>>>> I have seen that there is a BIOS update for my laptop, but im unsure it
>>>> could help for this at all (besides that i would have to install windows
>>>> 8
>>>> to install the friggin bios update)
>>>>
>>> Oskar,
>>>
>>> I am quite confused. Does the issue happen only after resume from
>>> hibernate?
>>> Initially you havn't mentioned hibernate/resume. Are you able to
>>> reproduce the issue without hibernating? Please flush ip table entries
>>> and test.
>>>
>>> sudo iptables -F
>>>
>>> Can you please take a sniffer capture at the problematic time? Are you
>>> seeing huge
>>> latency for ping (icmp)?
>>>
>>> -Rajkumar
>>>