From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qt0-x22c.google.com (mail-qt0-x22c.google.com [IPv6:2607:f8b0:400d:c0d::22c]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by lists.bufferbloat.net (Postfix) with ESMTPS id AF6AD3B2A4 for ; Sat, 19 May 2018 12:04:11 -0400 (EDT) Received: by mail-qt0-x22c.google.com with SMTP id f5-v6so14114399qth.2 for ; Sat, 19 May 2018 09:04:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:sender:from:date:message-id:subject:to:cc; bh=gyetYIvQWSjtwIxUbZSEaqHDNJXF91q9XcuXYTlX4EQ=; b=lzMRgL0W8WORPXWLyFHWgCYhOoSV7QiKXnKK2CrmZUXnDzfUiEAOLYNh3SR0NAyD4G sQyYLwjHvSeCNO8prhpqFvt4XxFf0UbA2LlcNzGtDTElbCZoa178lp8oGTQKWBpRuNe7 JxCz3pROK789REWPTSzkheTsEAG/StiCkORxv3qCEtO+YZ6mTryflByUOpzD1q+C6/+D 7CTdREZZGnToSdu1hSmhqnayy4x2zhOPlypUo0kvyD5OGQs5TfiN392Z5QfEQHvFV0My bWqz5s9Poy9Gh184ZWA7hMJ9r1smzopvTv+gL2j3FDse4KtPY4Tz713Lk31n3uYcu0W2 RgYw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:sender:from:date:message-id:subject :to:cc; bh=gyetYIvQWSjtwIxUbZSEaqHDNJXF91q9XcuXYTlX4EQ=; b=m2sXArP7dzPQTP3gwwRBxhFp+qTDSYIZ49JVkWK28gfU40XAHfF/VToAiTokhpKrFu jJDgMaBWwqV71HXURzAqNRpjnj4wBVcw3mIkXcySvmGk/8glWUgkpFEd0V6VvqC3suzR 18b2a4reRJFlIAlfoMXoZWAn7Ukp6/OKeJTpxna9IHqBm/FMK4afIglQD9zz5NQi9CoV W5+CFq7x2CRHcyWIo/UiHvpzO4YoBlvDzGXqcJlFnoUGEUKFVQUoDFNW1b0FAtkiY70m yxL8w9s5xAta3PIF9OKRkJKF8FwE8La58zcVc2ZMY3XtTUt8fFTq+F43QaYl0Ca6hvDi kFBg== X-Gm-Message-State: ALKqPwfSldIwhyp7lJvGTQBLiLFyEKNgDXzoJU+zCtw/c+cwU03FPGRd ebyb2RVHzBC1FAX9+iirvQoQ9uubb8tG8i48abymLw== X-Google-Smtp-Source: AB8JxZoAgrvETClhqeFWJd9M5g8KNa0LDoD91lFzItTui2VvTXxPVFNP+Vw2bAb5g+54H4Cldco4O4DTX/44M79qVyM= X-Received: by 2002:aed:2c22:: with SMTP id f31-v6mr12960085qtd.284.1526745850939; Sat, 19 May 2018 09:04:10 -0700 (PDT) MIME-Version: 1.0 Sender: bkil.hu@gmail.com Received: by 10.12.225.203 with HTTP; Sat, 19 May 2018 09:03:50 -0700 (PDT) From: bkil Date: Sat, 19 May 2018 18:03:50 +0200 X-Google-Sender-Auth: y7NcezED2tjMXW9QxoojLus4e4Q Message-ID: To: make-wifi-fast@lists.bufferbloat.net Content-Type: text/plain; charset="UTF-8" Subject: [Make-wifi-fast] mesh deployment with ath9k driver changes X-BeenThere: make-wifi-fast@lists.bufferbloat.net X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 19 May 2018 16:04:11 -0000 In reply to this thread: https://lists.bufferbloat.net/pipermail/make-wifi-fast/2018-April/001787.html Sorry for the late response, although I can see from yesterday's SmokePing plots that the issue still prevails. 1. You should definitely not allow rates as low as 1Mb/s considering: * plots of signal vs. rate, * topology of closely packed cabins; * mostly static, noise-free camp ground. Almost all of your clients were able to link with >20Mb/s even at 70-80dBm. Those below were probably just idling. I'd limit the network to 802.11g/n-only, and would even consider disabling all rates below 12Mb/s. This should help both in working around imperfect schedulers and clients roaming. You could double check the coverage afterwards with a simple site survey. You may also test whether disassoc_low_ack makes things more stable around the edge. Despite the recently introduced air fairness patches, most other points are still valid from these earlier articles due to pathological schedulers: http://divdyn.com/disable-lower-legacy-data-rates/ https://blogs.cisco.com/wireless/wi-fi-taxes-digging-into-the-802-11b-penalty https://www.networkworld.com/article/2230601/cisco-subnet/dropping-legacy-802-11-support-from-your-infrastructure--part-2-.html Disabling 802.11/b modulation also brings the added benefit of occupying less bandwidth (16.5-20 OFDM vs. 22 Barker/CCK), enabling the previously mentioned channel spacing of 1-5-9-13. https://wifinigel.blogspot.hu/2013/02/adjacent-channel-interference.html 2. Enable client isolation to mitigate broadcast storms. 3. If you still couldn't split the two cells that work on the same channel, at least try to reduce their TX power to reduce their range of interference. This may or may not improve things overall due to hidden nodes, though. We'd definitely love to hear from you whether any of these worked or made things worse. Happy camping!