From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from server19320154104.serverpool.info ([193.201.54.104]:38293 "EHLO hauke-m.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751079Ab1DYMvw (ORCPT ); Mon, 25 Apr 2011 08:51:52 -0400 Message-ID: <4DB56E5B.4090101@hauke-m.de> (sfid-20110425_145155_819786_9458A18A) Date: Mon, 25 Apr 2011 14:51:39 +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: ath9k: Regression in 2.6.38 (30% package losses, ~20KBit/s throughput) with AR9285 Content-Type: text/plain; charset=ISO-8859-1 Sender: linux-wireless-owner@vger.kernel.org List-ID: 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