From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-oi0-x22d.google.com (mail-oi0-x22d.google.com [IPv6:2607:f8b0:4003:c06::22d]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by huchra.bufferbloat.net (Postfix) with ESMTPS id 643DA21F279; Wed, 25 Feb 2015 20:37:40 -0800 (PST) Received: by mail-oi0-f45.google.com with SMTP id i138so7304573oig.4; Wed, 25 Feb 2015 20:37:40 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:content-transfer-encoding; bh=ZbK3r6WxUGMxgRkN4iCm+0oKEVkQeKqdPmlrcVpK5Z8=; b=r4hwxxT0MyUG0qVvz7ZeFJexvxXgIyOuD1Yn0ElV8u5ezkv10/UO++8ytCwfaheufn ol8JTPNQG2E3ZewEk1wA1wljKT3VPoT1SsUYC/nQfTVo+RnwoiZ1i7aOp+XyrG0G+tcM OU7/GCkk4dYnf0SdWB0fPwid5nt5U53xqRatwgrLi9u5FsDgd9FVSYR/TXx5Njs73HZ6 AZ4fV2VdlZY/EG3UBR6tGwDRzHonmg2sUwelAa2SHhXtrKhV+4/YOToqJdehDlXv85JA RJh+dpFKAGLWU7fTAMQ81gVt/LlV74Q+gUr7apz9m+c97Z/Sn7u5uO/BOOzE6KamaDb6 Sb5A== MIME-Version: 1.0 X-Received: by 10.60.57.9 with SMTP id e9mr4763038oeq.24.1424925460137; Wed, 25 Feb 2015 20:37:40 -0800 (PST) Received: by 10.202.51.66 with HTTP; Wed, 25 Feb 2015 20:37:40 -0800 (PST) In-Reply-To: <54EE9F84.6060508@candelatech.com> References: <54EE6222.5030408@candelatech.com> <54EE9F84.6060508@candelatech.com> Date: Wed, 25 Feb 2015 20:37:40 -0800 Message-ID: From: Dave Taht To: Isaac Konikoff Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Cc: cerowrt-devel , bloat Subject: Re: [Bloat] Two d-link products tested for bloat... X-BeenThere: bloat@lists.bufferbloat.net X-Mailman-Version: 2.1.13 Precedence: list List-Id: General list for discussing Bufferbloat List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 26 Feb 2015 04:38:09 -0000 On Wed, Feb 25, 2015 at 8:22 PM, Isaac Konikoff wrote: > > > On 02/25/2015 04:23 PM, Dave Taht wrote: >> >> On Wed, Feb 25, 2015 at 4:18 PM, Jonathan Morton >> wrote: >>>> >>>> Here's a comparison plot of box totals: >>> >>> http://www.candelatech.com/downloads/rtt_fair4be-comparison-box-plot.pn= g >>> >>> That's a real mess. All of them utterly fail to get download bandwidth >>> anywhere near the upload (am I right in assuming it should ideally be >>> about >>> equal?), and the only ones with even halfway acceptable latency are the >>> ones >>> with least throughput in either direction. >> >> >> And I suspect that this was a test at the highest possible MCS rates >> and txpower. Isaac? > > > Yes, highest MCS for each AP and fw defaulted tx power. I can experiment > with attenuation and lower MCS rates as well. Be prepared to be horrified in disbelief at your results at the lower rates... and post them anyway. I note that rtt_fair4be is a pretty stressful, artificial benchmark, and to truly stress things out requires more than one tcp flow per station in each direction, or attempting to also exercise the 802.11e queues. Or interference. Or multicast. I do believe, that once these enormous latencies are clobbered via various techniques in make-wifi-fast that it is possible to get bandwidth per station over tcp to degrade nearly linearly, and achieve close to the theoretical rate of the air, and for latencies to remain (on this 4 station test) typically in the 4-14ms range at all but the lowest MCS rates. IMHO an AP that one day does well on these tests will also do much better on a variety of others. :) btw, I show a detailed graph of TCP's actual behavior under circumstances like these at nearly every talk, with data taken on the actual conference wifi. It never occurred to me once, to show the bar chart! (out of the 14+ plots available). It might be helpful on your next test run to also do the simplest tests to a single station over each AP for a reference (tcp_upload, tcp_download, and tcp_bidirectional). >> >>> >>> - Jonathan Morton >> >> >> >> > --=20 Dave T=C3=A4ht Let's make wifi fast, less jittery and reliable again! https://plus.google.com/u/0/107942175615993706558/posts/TVX3o84jjmb