From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-lf0-x244.google.com (mail-lf0-x244.google.com [IPv6:2a00:1450:4010:c07::244]) (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 7C4EB3B2A3 for ; Wed, 22 Feb 2017 06:25:03 -0500 (EST) Received: by mail-lf0-x244.google.com with SMTP id z127so759213lfa.2 for ; Wed, 22 Feb 2017 03:25:03 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=JLC27FPmeXnnuXkDw2AKWIhz/FlLSUz1BIrWR2TuTYQ=; b=fszHly8xb8TE7urbRwpR0veDHZAF8p/saJyxBz0BPhYSM1LTSCT370mP9sZwGQSIQ/ 9RakKsY+O8Y4oL6R5oa0aM267RtpaANjpSR2drjz59W2oK/d1jcCyySjAm5ZvcVKPP7z kZBJhfhnwgVYxobvjuip43SEuuBMQyapqoP2LJ4LdB/PSYOF27gGxISxV+3nTqiYVkOn PrJ6z01eTzT29Ea72URce67RwAYf10OPcQ/YXhrx9aGSyqK40IFgjzyo1C815EI1i7VJ ltzjpHLcr0EGp9YWCBH5ylB4jH1lDObCdo7FKTwS6CGFftwCAXWy1XYwzOTqHmKjO7Jr nBsg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=JLC27FPmeXnnuXkDw2AKWIhz/FlLSUz1BIrWR2TuTYQ=; b=hk8T36uzUg6GZLNJFm1YutcJrFwLLKtw4K+4YgymdKRzR6JZCV6PmG7/HxbsLiMi6J jp4chY3ypbsjroLt7ygKPscS1HFqJBfcu94yBNkNhunSFO4N0X9hS+Qr6qfgh3Q8mnvB UWINl8bBaVjL7Y1i0KY9LF7kPNA7JE95TG3KWP9pKne2tlCIolUSmfqw49vzb/vo0EYI MiYqtG65Kwh8GTHtW72W6sB7zqqemyu3YWxHMs2zalHZC+grZpEZ8g+rrVgKJg7Kz+pG BJ2M5UgCXVgDFvGzjWcI+Z8qX/8i7VInClxsUoYBdosPGIu6AsEfJiStBjt9P8AFIwBA dnQg== X-Gm-Message-State: AMke39lZFAGD/Cu6rHwZjwvX2pIEMQGK6alAZzutDq8WPZcOOP9o0/vcDJ9Ynnhd0+IAjw== X-Received: by 10.46.69.139 with SMTP id s133mr8739153lja.56.1487762702303; Wed, 22 Feb 2017 03:25:02 -0800 (PST) Received: from [192.168.100.16] (37-219-206-78.nat.bb.dnainternet.fi. [37.219.206.78]) by smtp.gmail.com with ESMTPSA id p11sm328566lfd.20.2017.02.22.03.25.01 (version=TLS1 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Wed, 22 Feb 2017 03:25:01 -0800 (PST) Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 9.3 \(3124\)) From: Jonathan Morton In-Reply-To: Date: Wed, 22 Feb 2017 13:24:59 +0200 Cc: cake@lists.bufferbloat.net Content-Transfer-Encoding: quoted-printable Message-Id: <5B0FDEF9-6F7A-4222-8B73-C421066AB111@gmail.com> References: To: Pete Heist X-Mailer: Apple Mail (2.3124) Subject: Re: [Cake] diffserv3 tin 2 target 50% of interval? X-BeenThere: cake@lists.bufferbloat.net X-Mailman-Version: 2.1.20 Precedence: list List-Id: Cake - FQ_codel the next generation List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 22 Feb 2017 11:25:03 -0000 > On 22 Feb, 2017, at 13:12, Pete Heist wrote: >=20 > Ok, but for what it=E2=80=99s worth, so far I=E2=80=99m not seeing = this confer any benefit as far as latency is concerned. I will make full = results available later, but for now, here are two plots for the rrul = test The RRUL test, when viewed in Flent, only shows the latency induced by = one flow (bulk) on another (ping). This is influenced mainly by the = flow-isolation and priority-queue mechanisms, not by AQM. Where AQM helps is the effect of a flow on its *own* latency. A bulk = flow benefits relatively little from reduced latency, and mainly in the = area of loss recovery; it also wants to operate in (or very near) the = saturated regime as much as possible. A latency-sensitive flow, by = contrast, wants to avoid the saturated regime and its induced latency = completely, and will accept higher packet loss to achieve that. Cake keeps the inter-flow induced latency down to very near its = theoretical minimum, given certain practical constraints such as timer = and CPU-scheduling latency. That=E2=80=99s mostly why you don=E2=80=99t = see a latency difference in RRUL. The other major factor is that RRUL = loads all tins with bulk data, which means the Voice tin in particular = is running in deprioritised mode. - Jonathan Morton