From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-lj1-x232.google.com (mail-lj1-x232.google.com [IPv6:2a00:1450:4864:20::232]) (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 A38053B2A4 for ; Tue, 27 Aug 2019 03:05:16 -0400 (EDT) Received: by mail-lj1-x232.google.com with SMTP id t14so17443839lji.4 for ; Tue, 27 Aug 2019 00:05:16 -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=pRvUDyKaCoKhKN2UMZdm6UgFz7aJnVJrROhuX97dI7c=; b=c7bTOMPf4+p+f9VtLPhZiGffzDF6cWYZc/y4VUAhBbKBeyrbzaum6jeUWMd9gdLtbL zs7BbHECV8mpIV53T0DV0TB1kS+b6nbOg6QgWebvAKyNfAdI+4WYkYKifkmAs7oJoVsx M5lNrdeNsfa6ea/V1VVAFql2BzfzEhHP4zTtNwZMCZEx3YtcHtiDzY+VFG9/vxhIhd3Y 7eSUvowCRiZQsbs3aMS/w/4FWXqi4FRHJkui3IMkpJ2hrJFPFZPEHuHXvChVV4wJ2326 f6PB9C+jOevp8jK17H8896tUhaXqoyI1FFHe1L242Q18ZZPxEw+sq/hUO205Bf65W+nb 7E7A== 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=pRvUDyKaCoKhKN2UMZdm6UgFz7aJnVJrROhuX97dI7c=; b=pCo94GPW7sksbiBPD3LDIQ1S3vyBXuY95eM39IToZbF9yNPuIS8p+HrWAzBBOw1WIn sU3y2S5hoJ2UkZ5nq0uQGDSI8O9Ny5UhOkXkhQUsfajQKCerTTIn37O9EZySCiEA65wU QDPpCBORlsPB4e3WFBCc1ePG+CUYT//Gtl3fH6oC97MWszkXMc59IABGoSOWnm1oHtzK hG263CedGSSMIY1Dgk58qKbokukHWd6yLnryfqg92oWe+KSPCxU0gd4oXnOKg2MSOZoj HnaCmkE6LUPz5wnVtAkU5PCIW7+DjpPk2cCZEkGhgREnOmmE8mfOk92pRNbhlkoabUNH 8/ZQ== X-Gm-Message-State: APjAAAWiaT7aAcznGCVpoVeYHbRDoTeX4AMj4zRzf+GqtNAvXqwHWGac 3AcQAJCT5hqf+ecVxJdIKgI= X-Google-Smtp-Source: APXvYqxk4lN60E0MIAkWftL8rtQIruXM4jNVJiYngvg6jYvqt48cxAZVjozPPNVsEN6JtYBYxpsiFA== X-Received: by 2002:a2e:85c6:: with SMTP id h6mr2184787ljj.186.1566889515530; Tue, 27 Aug 2019 00:05:15 -0700 (PDT) Received: from jonathartonsmbp.lan (83-245-237-193-nat-p.elisa-mobile.fi. [83.245.237.193]) by smtp.gmail.com with ESMTPSA id l3sm1619964lfk.84.2019.08.27.00.05.14 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 27 Aug 2019 00:05:14 -0700 (PDT) Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 11.5 \(3445.9.1\)) From: Jonathan Morton In-Reply-To: <1444CD38-2455-41DF-A7FF-17FFC1039E36@gmx.de> Date: Tue, 27 Aug 2019 10:05:13 +0300 Cc: =?utf-8?Q?Dave_T=C3=A4ht?= , ECN-Sane Content-Transfer-Encoding: quoted-printable Message-Id: <9E5E5296-EF62-46C4-8AD5-F93D5A03BDB7@gmail.com> References: <1444CD38-2455-41DF-A7FF-17FFC1039E36@gmx.de> To: Sebastian Moeller X-Mailer: Apple Mail (2.3445.9.1) Subject: Re: [Ecn-sane] osx ecn X-BeenThere: ecn-sane@lists.bufferbloat.net X-Mailman-Version: 2.1.20 Precedence: list List-Id: Discussion of explicit congestion notification's impact on the Internet List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 27 Aug 2019 07:05:16 -0000 > On 27 Aug, 2019, at 9:58 am, Sebastian Moeller = wrote: >=20 >> 0 connection fell back to non-ECN due to excessive CE-markings >=20 > I wonder whether macosx would be able to gracefully survive a = misclassification into a L4S/NQB queue at a dual queue AQM? What is the = threshold here? No, I don't think so. L4S assumes the DCTCP response function which = stabilises at 2 CE marks per RTT, which is still a fairly low percentage = if the cwnd is high. I doubt that would be detected as "excessive" in = this context. Also, because the RFC-3168 response to CE is much = sharper, the actual marking rate will be lower, as the flow won't stay = in the saturating regime where marking occurs. - Jonathan Morton=