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[178.55.159.67]) by smtp.gmail.com with ESMTPSA id m13sm11164062edi.87.2020.12.06.17.00.16 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Sun, 06 Dec 2020 17:00:17 -0800 (PST) Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 11.5 \(3445.9.7\)) From: Jonathan Morton In-Reply-To: Date: Mon, 7 Dec 2020 03:00:15 +0200 Cc: bloat , make-wifi-fast-request@lists.bufferbloat.net Content-Transfer-Encoding: quoted-printable Message-Id: References: To: Rich Brown X-Mailer: Apple Mail (2.3445.9.7) Subject: Re: [Bloat] Good Wi-Fi test programs? X-BeenThere: bloat@lists.bufferbloat.net X-Mailman-Version: 2.1.20 Precedence: list List-Id: General list for discussing Bufferbloat List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 07 Dec 2020 01:00:18 -0000 > On 7 Dec, 2020, at 1:00 am, Rich Brown = wrote: >=20 > I would first do the following "easy tests": >=20 > - Check for conflicting/overlapping Wi-Fi channels. I am fond of the = free app, WiFi Analyzer from farproc = (http://a.farproc.com/wifi-analyzer) for this test, but there are = several similar Android apps.=20 > - Compare the signal strength for the DSL modem and the Calix modem, = as shown by WiFi Analyzer=20 > - Be sure that all computer(s) are using the Calix modem. > - Use a variety of speed tests: DSLReports, Fast.com, other favorites? > - Compare speedtest results when the test computer is close to, or far = from the router. > - (If possible) compare the performance for both Wi-Fi and Ethernet > - Shut off the DSL modem on my way out the door to be sure it's not = causing interference or confusing the situation. >=20 > Anything else you'd recommend? Make sure the customer's devices are using 5GHz rather than 2.4GHz band, = where possible. The Calix devices apparently support both and try to = perform "band steering", but it's worth double checking. = https://www.calix.com/content/calix/en/site-prod/library-html/systems-prod= ucts/prem/op/p-gw-op/eth-gw/800e-gc-spg/index.htm?toc.htm?76518.htm I also read while briefly scanning the accessible documentation that = Calix operates at maximum permitted wifi transmit power and with up to = 80MHz RF bandwidth. While this does maximise the range and throughput = of an individual AP, many such APs in close proximity will see the RF = channel as "occupied" by each others' transmissions more often than if a = lower transmit power were used. The result is that they all shout so = much that they can't hear themselves think, and clients can't get a word = in edgewise to send acks (with generally lower transmit power = themselves). You should look for evidence of this while analysing channel occupancy, = especially in multi-occupancy buildings. It's probably less of a = concern in detached or semi-detached housing. I didn't see any mention of Airtime Fairness technology, which is now a = highlighted feature on some other manufacturers' products (specifically = TP-Link). Ask whether that is present or can be implemented. You may = be able to test for it, if you have established a case where wifi is = clearly the bottleneck, by passing a saturating ECN Capable flow through = it and looking for CE marks (and/or ECE feedback), since Airtime = Fairness comes with built-in fq_codel. - Jonathan Morton=