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Date: Mon, 15 Aug 2011 20:26:32 +0530
Message-ID: <CAD2nsn3c=eR7gx+UG-VZWq7EkRioJcBexPHJXNCF+GfA2WgSog@mail.gmail.com> (sfid-20110815_165643_997523_D6A8765F)
Subject: Re: [ath9k-devel] Packet loss regression with Atheros AR9280
From: Mohammed Shafi <shafi.wireless@gmail.com>
To: Jan Sundman <jan.sundman@aland.net>
Cc: robert@ocallahan.org, ath9k-devel@venema.h4ckr.net,
	linux-wireless@vger.kernel.org
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Sender: linux-wireless-owner@vger.kernel.org

On Sat, Aug 13, 2011 at 4:51 PM, Jan Sundman <jan.sundman@aland.net> wrote:
> Hi,
>
> I'm not sure whether you have found a solution to this issue yet but I
> thought that I should share my findings. I'm running Arch linux on my
> laptop which have the AR9280 and I saw massive packet loss as well.

is it an in built card?

>
> I noticed however that this _only_ occurred when the laptop was on
> battery power. So it seems to be due to some power save functionality
> for the card.

if its an in built card, then
this looks like a platform issue, if so please use
 http://www.kernel.org/pub/linux/kernel/people/mcgrof/scripts/cpudmalatency.c
 http://johannes.sipsolutions.net/files/netlatency.c.txt

 >
> "iwconfig wlan0 power off" seems to fix it so I added this to my startup
> script and this fixes it. This is of course not a optimal solution but
> may point you in the right direction on fixing the problem.
>
> Br,
>
> /Jan
>
>>On 12 August 2011 10:27, Robert O'Callahan ><robert@ocallahan.org>
> wrote:
>
>>> Anything I can get building with this kernel, I guess. Any particular
>>> version I should try?
>
>>I'd suggest going back a month at a time
>>(http://www.orbit-lab.org/kernel/compat-wireless-2.6/2011/), >try each
>>until you find one that works, then report >"compat-wireless X works,
>>compat-wireless Y doesn't". That'll be a good way to >test multiple
>>copies of the development wireless tree.
>
>>If someone Fedora-clued knows which version(s) of the >wireless code
>>are involved with Robert's good and bad behaviour >reports, that'll
>>also help.
>
>>Anything to kick-start a git bisect :-)
>
>>Ciao,
>
>
>>Adrian
>
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>


-- 
shafi