ath9k: Regression in 2.6.38 (30% package losses, ~20KBit/s throughput) with AR9285

ath9k: Regression in 2.6.38 (30% package losses, ~20KBit/s throughput) with AR9285

[Hauke Mehrtens]

Hi,

with kernel 2.6.38 the wifi connection with my Atheros AR9285 is
unusable when the distance from the AP is more that 3 meters. (30%
package losses, ~20K/s throughput compared to ~3M/s) Tested with two
cards on different devices. With kernel 2.6.35 or kernel 2.6.38 +
compat-wireless 15 meters distance is no problem. The problem only
occurs in 2.6.38-rc1 to 2.6.38.4 but not in any more recent versions. I
did a git bisect and found the commit fixing the problem.

commit 115dad7a7f42e68840392767323ceb9306dbdb36
Author: Felix Fietkau <nbd@openwrt.org>
Date:   Fri Jan 14 00:06:27 2011 +0100

    ath9k_hw: partially revert "fix dma descriptor rx error bit parsing"

http://www.spinics.net/lists/linux-wireless/msg62742.html

Please send this commit to the stable series for 2.6.38.

The problem is also described at the Ubuntu launchpad:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/735431

Hauke

Re: ath9k: Regression in 2.6.38 (30% package losses, ~20KBit/s throughput) with AR9285

[Hauke Mehrtens]

On 04/25/2011 02:51 PM, Hauke Mehrtens wrote:
> Hi,
> 
> with kernel 2.6.38 the wifi connection with my Atheros AR9285 is
> unusable when the distance from the AP is more that 3 meters. (30%
> package losses, ~20K/s throughput compared to ~3M/s) Tested with two
> cards on different devices. With kernel 2.6.35 or kernel 2.6.38 +
> compat-wireless 15 meters distance is no problem. The problem only
> occurs in 2.6.38-rc1 to 2.6.38.4 but not in any more recent versions. I
> did a git bisect and found the commit fixing the problem.
> 
> commit 115dad7a7f42e68840392767323ceb9306dbdb36
> Author: Felix Fietkau <nbd@openwrt.org>
> Date:   Fri Jan 14 00:06:27 2011 +0100
> 
>     ath9k_hw: partially revert "fix dma descriptor rx error bit parsing"
> 
> http://www.spinics.net/lists/linux-wireless/msg62742.html
> 
> Please send this commit to the stable series for 2.6.38.
> 
> The problem is also described at the Ubuntu launchpad:
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/735431
> 
> Hauke

I linked to a wrong Ubuntu Launchpad bug report. This is a correct one,
but there many many:
https://bugs.launchpad.net/archlinux/+source/linux/+bug/735171

Here is also a description in the kernel bugzilla:
https://bugzilla.kernel.org/show_bug.cgi?id=31452

Hauke

Re: ath9k: Regression in 2.6.38 (30% package losses, ~20KBit/s throughput) with AR9285

[John W. Linville]

You can send stuff to stable yourself.  The main rule is that it is
already in Linus's tree...

Stable folks, please apply 115dad7a7f42e68840392767323ceb9306dbdb36
for the 2.6.38.y tree.

John

On Mon, Apr 25, 2011 at 03:05:04PM +0200, Hauke Mehrtens wrote:
> On 04/25/2011 02:51 PM, Hauke Mehrtens wrote:
> > Hi,
> > 
> > with kernel 2.6.38 the wifi connection with my Atheros AR9285 is
> > unusable when the distance from the AP is more that 3 meters. (30%
> > package losses, ~20K/s throughput compared to ~3M/s) Tested with two
> > cards on different devices. With kernel 2.6.35 or kernel 2.6.38 +
> > compat-wireless 15 meters distance is no problem. The problem only
> > occurs in 2.6.38-rc1 to 2.6.38.4 but not in any more recent versions. I
> > did a git bisect and found the commit fixing the problem.
> > 
> > commit 115dad7a7f42e68840392767323ceb9306dbdb36
> > Author: Felix Fietkau <nbd@openwrt.org>
> > Date:   Fri Jan 14 00:06:27 2011 +0100
> > 
> >     ath9k_hw: partially revert "fix dma descriptor rx error bit parsing"
> > 
> > http://www.spinics.net/lists/linux-wireless/msg62742.html
> > 
> > Please send this commit to the stable series for 2.6.38.
> > 
> > The problem is also described at the Ubuntu launchpad:
> > https://bugs.launchpad.net/ubuntu/+source/linux/+bug/735431
> > 
> > Hauke
> 
> I linked to a wrong Ubuntu Launchpad bug report. This is a correct one,
> but there many many:
> https://bugs.launchpad.net/archlinux/+source/linux/+bug/735171
> 
> Here is also a description in the kernel bugzilla:
> https://bugzilla.kernel.org/show_bug.cgi?id=31452
> 
> Hauke
> --
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> 

-- 
John W. Linville		Someday the world will need a hero, and you
linville@tuxdriver.com			might be all we have.  Be ready.

Re: [stable] ath9k: Regression in 2.6.38 (30% package losses, ~20KBit/s throughput) with AR9285

[Greg KH]

On Mon, Apr 25, 2011 at 01:07:51PM -0400, John W. Linville wrote:
> You can send stuff to stable yourself.  The main rule is that it is
> already in Linus's tree...
> 
> Stable folks, please apply 115dad7a7f42e68840392767323ceb9306dbdb36
> for the 2.6.38.y tree.

Now queued up.

thanks,

greg k-h