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

[Hauke Mehrtens <hauke@hauke-m.de>]

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