From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from server19320154104.serverpool.info ([193.201.54.104]:58034 "EHLO hauke-m.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751827Ab1DYNFL (ORCPT ); Mon, 25 Apr 2011 09:05:11 -0400 Message-ID: <4DB57180.40208@hauke-m.de> (sfid-20110425_150532_150043_846CE7A2) Date: Mon, 25 Apr 2011 15:05:04 +0200 From: Hauke Mehrtens MIME-Version: 1.0 To: Felix Fietkau , "Luis R. Rodriguez" , Vasanthakumar Thiagarajan , Senthil Balasubramanian , Jouni Malinen CC: ath9k-devel@lists.ath9k.org, "linux-wireless@vger.kernel.org" Subject: Re: ath9k: Regression in 2.6.38 (30% package losses, ~20KBit/s throughput) with AR9285 References: <4DB56E5B.4090101@hauke-m.de> In-Reply-To: <4DB56E5B.4090101@hauke-m.de> Content-Type: text/plain; charset=ISO-8859-1 Sender: linux-wireless-owner@vger.kernel.org List-ID: 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 > 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