From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wr1-x42b.google.com (mail-wr1-x42b.google.com [IPv6:2a00:1450:4864:20::42b]) (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 D813B3CB35 for ; Fri, 4 Jan 2019 06:34:43 -0500 (EST) Received: by mail-wr1-x42b.google.com with SMTP id v13so36320167wrw.5 for ; Fri, 04 Jan 2019 03:34:43 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=heistp.net; s=google; h=mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=yGjeX35hwkF8gjPTxtIu5yMIgg9Q8AXZzO+K87/uYnc=; b=ThAn8IijNfKu0sBmNI7pBg/ipFKICIMRY/xg6bHGxoVwRDxBEJmsNIYX4KzAvUpPyW edIERmllZrF/vEREHYy5U7uoSrXdxTCHcCblSovVb+SiPiNu84dPUiA28reRDDeGAjTo egqpiPX0Paxq3PrUkZy4Yd5fDtd7uCwWDa7e7v0YjuJP2yd5rD02FwDOzcM8MFoD/G4Z HL5RSnqgjd8z9wVJ0QD51B8c0EtK9t5zvwnjjDYa4JfCu63sz3ierQXz4qieVxGnTD4Z 1ajWg1+XSBmbeYVBguw8GlBJULOLKzpilS8ARgHMHRPA2MEMdI80EfoUSzazRny6FIs6 8KEw== 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=yGjeX35hwkF8gjPTxtIu5yMIgg9Q8AXZzO+K87/uYnc=; b=UgUM65cBr26Gl8TGYJvPJyL/LnN1XTyXmRghqMgcun0s3bSsmC8ow9o6FQo9TY+l0o 5rtGe8TQXOLCrIM7P84c2iCFgVHmdKGEYWtrc4YnGpXMwhKLipBHu8FZkkniLpBteBPh CNtU1rhoPu1a7AjZgnJn2S4FjVP3Jw/5LPMbHROGWQRAO7Nm9qnVypjcMS3A896scv4s va0Ah0kdadfS7BFGoq8Zp2r+MY1jNQ3cz9tHRMLmUljwyBIQTvJBpsUQmeLCyQcoe4Eb G3u5RftaL8Db1038aRR66RBHLGqYyjLI2bAZb6R3wSR8jlA8NGwbSezwmz3OFjVurigU n4eA== X-Gm-Message-State: AJcUukcpKSddnULMmqH4VvnavRjZnw/Zm//Vn8C00QP1Fnoz2HAertp4 NlQoYK1Zney9z/xS7mz0fffc2A== X-Google-Smtp-Source: ALg8bN4fSWgRYMBuUp3dfI4PgPXolZeJUBXMEhv/+1P2d/RSZqenrVpqaLcF7HX7oEfuGN5qYP4HNg== X-Received: by 2002:a05:6000:120a:: with SMTP id e10mr44503803wrx.85.1546601682962; Fri, 04 Jan 2019 03:34:42 -0800 (PST) Received: from tron.luk.heistp.net (h-1169.lbcfree.net. [185.193.85.130]) by smtp.gmail.com with ESMTPSA id n127sm794132wmd.20.2019.01.04.03.34.41 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 04 Jan 2019 03:34:42 -0800 (PST) Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 11.5 \(3445.9.1\)) From: Pete Heist In-Reply-To: Date: Fri, 4 Jan 2019 12:34:40 +0100 Cc: Jonathan Morton , Cake List Content-Transfer-Encoding: quoted-printable Message-Id: References: <8F9DE6A8-8614-46A8-9E9B-7B7E4CC7414F@heistp.net> <43a8ddec5beb962c53fe828363ecc839832de2c0.camel@gmail.com> <3650A136-97A6-43F5-ADD3-B94A19775379@gmail.com> <99C93851-3539-4CB6-BED1-193B56658486@heistp.net> <87imz6xatw.fsf@toke.dk> To: =?utf-8?Q?Toke_H=C3=B8iland-J=C3=B8rgensen?= X-Mailer: Apple Mail (2.3445.9.1) Subject: Re: [Cake] dual-src/dsthost unfairness, only with bi-directional traffic 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: Fri, 04 Jan 2019 11:34:44 -0000 > On Jan 3, 2019, at 2:02 PM, Pete Heist wrote: >=20 > I tried iperf3 in UDP mode, but cake is treating these flows = aggressively. I get the impression that cake penalizes flows heavily = that do not respond to congestion control signals. If I pit one 8 TCP = flows against a single UDP flow at 40mbit, the UDP flow goes into a = death spiral with increasing drops over time (iperf3 output attached). Sigh, this spiraling was partly because iperf3 in UDP mode sends 8k = buffers by default. If I use =E2=80=9C-l 1472=E2=80=9D with the iperf3 = client, the send rates are the same, but the packet loss is much lower, = without interplanetary. So one more result: IP1 1-flow TCP up: 49 - 59.5 IP2 8-flow UDP 48-mbit up: 48 - 36 (loss 0% - 25%) IP1 8-flow UDP 48-mbit down: 47.5 - 35.8 (loss 0% - 25%) IP2 1-flow TCP down: 21.8 - 61.5 I do see the rates and loss gradually change over 60 seconds, so numbers = are shown at t=3D0 and t=3D60 seconds. I=E2=80=99ve read that nuttcp does UDP bulk flows better than iperf3, so = one day I may try that.=