Return-path: Received: from nm9.bullet.mail.bf1.yahoo.com ([98.139.212.168]:21664 "HELO nm9.bullet.mail.bf1.yahoo.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1757360Ab1F0K0y convert rfc822-to-8bit (ORCPT ); Mon, 27 Jun 2011 06:26:54 -0400 References: <1308750102.64154.YahooMailRC@web161214.mail.bf1.yahoo.com> (sfid-20110622_154146_913504_76736765) <1308750416.29571.10.camel@jlt3.sipsolutions.net> <1308753669.17439.YahooMailRC@web161208.mail.bf1.yahoo.com> <1308754204.29571.15.camel@jlt3.sipsolutions.net> <1308755270.21489.YahooMailRC@web161204.mail.bf1.yahoo.com> <4E074609.5080500@openwrt.org> Message-ID: <1309170413.17395.YahooMailRC@web161202.mail.bf1.yahoo.com> (sfid-20110627_124357_713001_E20ED04B) Date: Mon, 27 Jun 2011 03:26:53 -0700 (PDT) From: Joerg Pommnitz Subject: Re: [ath5k-devel] Performance regression between Madwifi/net80211 and ath5k/mac80211 To: Felix Fietkau Cc: linux-wireless@vger.kernel.org, ath5k-devel@lists.ath5k.org In-Reply-To: <4E074609.5080500@openwrt.org> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Sender: linux-wireless-owner@vger.kernel.org List-ID: Felix, thanks for taking an interest in this. To answer your questions: Originally I ran the stock Fedora 15 wireless modules from kernel 2.6.38.8-32.fc15.i686. Today I reran the test with the wireless modules from compat-wireless-3.0-rc4-1. Unfortunately there doesn't seem to be any difference. Attached are the summary lines from a 100secon TCP iperf run: ath5k from kernel 2.6.38.8-32.fc15: [ 4] 0.0-100.7 sec 265 MBytes 22.1 Mbits/sec ath5k from compat-wireless-3.0-rc4-1: [ 4] 0.0-100.9 sec 268 MBytes 22.2 Mbits/sec madwifi-0.9.4-r4144-20110602: [ 4] 0.0-100.4 sec 306 MBytes 25.6 Mbits/sec There is obviously little performance change from 2.6.38 to the current 3.0 version of ath5k. And there is a significant performance loss relative to Madwifi. The iperf tests were run in 802.11a (channel 40) in IBSS mode. Similar performance differences were previously observed in AP mode as well. -- Thanks and kind regards Joerg ----- Original Mail ---- > Von: Felix Fietkau > An: Joerg Pommnitz > CC: linux-wireless@vger.kernel.org; ath5k-devel@lists.ath5k.org > Gesendet: Sonntag, den 26. Juni 2011, 16:45:29 Uhr > Betreff: Re: [ath5k-devel] Performance regression between Madwifi/net80211 and >ath5k/mac80211 > > On 2011-06-22 5:07 PM, Joerg Pommnitz wrote: > >> I guess you'll need more help from the HW people here. > > > > Bob, Bruno, Felix, Luis, Nick: Do you read? > What mac80211/ath5k version did you use? If you're using the in-kernel ath5k >from 2.6.38, > > then I'd suggest testing with a recent compat-wireless version. I made some >bug fixes and > performance improvements in April - and I think those went into 2.6.39. > > - Felix >