Return-path: Received: from mail-yi0-f46.google.com ([209.85.218.46]:41361 "EHLO mail-yi0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757875Ab1FVCRG convert rfc822-to-8bit (ORCPT ); Tue, 21 Jun 2011 22:17:06 -0400 Received: by yia27 with SMTP id 27so155934yia.19 for ; Tue, 21 Jun 2011 19:17:06 -0700 (PDT) MIME-Version: 1.0 In-Reply-To: References: Date: Wed, 22 Jun 2011 10:17:05 +0800 Message-ID: (sfid-20110622_041711_342527_6375DEE5) Subject: Re: Performance regression between Madwifi/net80211 and ath5k/mac80211 From: Adrian Chadd To: jpo Cc: linux-wireless@vger.kernel.org Content-Type: text/plain; charset=ISO-8859-1 Sender: linux-wireless-owner@vger.kernel.org List-ID: Have you eliminated the kernel version as being the problem? Adrian On 22 June 2011 04:09, jpo wrote: > Hello all, > there seems to be a significant performance loss when moving from Madwifi > to ath5k. For an embedded project we have been using Madwifi with Linux kernel > 2.6.23. We have tested ath5k for some time and by now it seems to be stable > enough for production use. Unfortunately it doesn't match Madwifi's performance. > Running iperf (both, UDP and TCP) between two machines equipped with an AR5413 > with the Fedora 15 kernel and the stock Fedora 15 wireless subsystem shows a > performance loss of about 10% relative to 2.6.23 and Madwifi-0.9.4. > The tests where done under close to ideal lab conditions (cards connected with > an antenna cable) running an IBSS network on channel 40 (5200MHz). > > Can anybody confirm this observation? > Is there an explanation? > Are there some tuning knobs I could try to improve the performance with > mac80211/ath5k? > Is the problem outside the wireless subsystem (Maybe it's the TCP/IP stack or > something Fedora specific)? > > Thanks in advance. > ?Joerg > > -- > To unsubscribe from this list: send the line "unsubscribe linux-wireless" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at ?http://vger.kernel.org/majordomo-info.html >