From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-lf0-x236.google.com (mail-lf0-x236.google.com [IPv6:2a00:1450:4010:c07::236]) (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 B473B3CB35 for ; Tue, 17 Apr 2018 10:03:15 -0400 (EDT) Received: by mail-lf0-x236.google.com with SMTP id q5-v6so27470883lff.12 for ; Tue, 17 Apr 2018 07:03:15 -0700 (PDT) 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=6eJaocU/zH/AAYHSL4u4h/qdSvdHsMSLncV8w+nbzjM=; b=vJElG/xO756aTRpvL9Ux4G9/eMO4wVh4t8fxbqBmk8WGqGMsnVa7HLxwRZZZLD9lW9 uqtw6WLQCp83JYh+VMcGZvbwHqrRN/lzEUNKCiX6dwrY4zcLoitUnqQWFakvSAs+lUPO L+yF/oLI+I7fsYw0BsREeRvXke892xFUB1+2yRuD4H9E7Jn1F/ixS2JP1kRwFJWqqEi0 +XfOzAr/qUW1wAIahy/zfYrLJl9cwGQoph7y3R08/PIDG+DhJ7hkFSElXXePGpqVtV/V YiIo7CnR2yMRHXZJUzYOBKXIvoiT7wRgLQhR77mB6/8dhhjRMImfMPSsEt0w8g4bLri8 Fmsw== 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=6eJaocU/zH/AAYHSL4u4h/qdSvdHsMSLncV8w+nbzjM=; b=uEyKCtJyfaiYuHPxrknYLMnPsxw1b37xpsBSCoXC6qrrpSmBEpGtGmZyX0dC7hB/yu R/p5wikTYpjomn3+lTKdUsP7woGyrzgFes9Iyq0sMsAoZ7Mk6wAawi+fv816R2/kXx75 hDrU394vtQgH2Hs+oJ6tLhwKx5HzF7bceB6uLUkP28GW4oSoXMYRwoV/hy/J3Yz/bHEU DnYqmedpRhaPqOzRxJ4wKO6EwjULM7Zsr5OtZGHRvtHrnWIs1NB7Zx6lV9kij7ENteAy inTBk1nOi0A9+mz3mPDWpJxqIn8lRLfEpXAVaQfuq7gVISopmCnVKJRz8m4riwvikMBO QMHw== X-Gm-Message-State: ALQs6tA+28J7cQPIGBsXFEFTiBJ1hPXmp1aezLdEJLZvRBiJ7HGw4gwl vXvnwgi2zXYkhmx4mmEvaoM= X-Google-Smtp-Source: AIpwx48ywtvgN9W4mjHwSTab2BfqsfNuJcxTuuaUxC5TPpQw5Didv3jf6ZhV8OTXlKgFamEB3cBC1g== X-Received: by 10.46.62.12 with SMTP id l12mr1603315lja.66.1523973794525; Tue, 17 Apr 2018 07:03:14 -0700 (PDT) Received: from [192.168.239.216] (83-245-234-255-nat-p.elisa-mobile.fi. [83.245.234.255]) by smtp.gmail.com with ESMTPSA id s9-v6sm377432lfk.28.2018.04.17.07.03.13 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 17 Apr 2018 07:03:14 -0700 (PDT) Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 11.3 \(3445.6.18\)) From: Jonathan Morton In-Reply-To: <87vacq419h.fsf@toke.dk> Date: Tue, 17 Apr 2018 17:03:12 +0300 Cc: cake@lists.bufferbloat.net Content-Transfer-Encoding: quoted-printable Message-Id: References: <87vacq419h.fsf@toke.dk> To: =?utf-8?Q?Toke_H=C3=B8iland-J=C3=B8rgensen?= X-Mailer: Apple Mail (2.3445.6.18) Subject: Re: [Cake] A few puzzling Cake results 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: Tue, 17 Apr 2018 14:03:16 -0000 > On 17 Apr, 2018, at 12:42 pm, Toke H=C3=B8iland-J=C3=B8rgensen = wrote: >=20 > - The TCP RTT of the 32 flows is *way* higher for Cake. FQ-CoDel > controls TCP flow latency to around 65 ms, while for Cake it is all > the way up around the 180ms mark. Is the Codel version in Cake too > lenient, or what is going on here? A recent change was to increase the target dynamically so that at least = 4 MTUs per flow could fit in each queue without AQM activity. That = should improve throughput in high-contention scenarios, but it does come = at the expense of intra-flow latency when it's relevant. To see whether Diffserv actually prioritises correctly, you'll need to = increase the number of bulk flows beyond the point where the VoIP flow = no longer receives the bandwidth it needs purely from its fair share of = the link. - Jonathan Morton