From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-lj1-x236.google.com (mail-lj1-x236.google.com [IPv6:2a00:1450:4864:20::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 602603CB35 for ; Thu, 8 Aug 2019 13:50:35 -0400 (EDT) Received: by mail-lj1-x236.google.com with SMTP id m8so56099887lji.7 for ; Thu, 08 Aug 2019 10:50:35 -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=5zVF/qhDB9Jlcp8Ufc8XUWHpZywInJu5nMvXW3XEVl4=; b=kwla6XqVU6NaEwWMRdYJG8qbQMLeCuScRI1YKKaSSMVWDPyKBF1l3CcvgNDwtPX/Vf 0IFLms3cU/cHbiXzhRJlEEO2uSGarxHKOKZLiISnwsM6kv/3J0u5qCuv2etywZMOaYO/ kdQUbwbSMN4zGcqT6Bkuww0jMwCo9HBrbIzb7L+e1mgMdWm9SHxmbkzTRare/EaHJnu1 lS5VQJAwhKeVYBtSlDiINBzxlA8jyeccOnWgLV+ZM/2RC1QSmHsmVQa2rU2MBpM+LWxw 1xsF/DIC1A5lLTxHLAMttFfQ0QQ/Je4P5Fv5hG23Mo+VDsE7ETVbu3TvbJyN43KCt6Hp NpNw== 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=5zVF/qhDB9Jlcp8Ufc8XUWHpZywInJu5nMvXW3XEVl4=; b=rmM0p755OcYoXHTOohiP2TkQfhGoWtKTvwP3IZst2T+FPTTZ2nR+aKk1YRM/ybXa/F 2LYqCYURbS4XrQN1XrGRP+4mqeNymf9bWvx32oJ89kgWqIsn7BhmKn5GplvWsL9/UbUH qczv6zJ9e/mcziYpYpDALJ2OkuohtfO+8G0zuxeL8TlNzqB8KuvSb0g8hbCvhZwCI5y6 JV0IFFz9HBFo7IcyUMBpt7SfV2tuaVjb4NcghqDcLgMJpTtC2dHlCeDMcnu3nWCArnjC ezHTNWhfFDJuInIpXwD+eXPduRkJz09kCI547kq8zkO5+JGFdcZuHu3OBbqERCuEI/Tg +hOQ== X-Gm-Message-State: APjAAAU7BVb0b2NW5sYtiefEaoH602Mevl+FJJJvNX4D7stPtK8Vjd8f cwKxGdIp0KdB3Rxx55cEguk= X-Google-Smtp-Source: APXvYqzRkfRXCt16AcGaSN+L6GVbjY/hzH4zUw6COgWwIogCjesVwTRB0Tbl3DmIkLGftYMaTYOLqw== X-Received: by 2002:a2e:3602:: with SMTP id d2mr9184173lja.112.1565286634274; Thu, 08 Aug 2019 10:50:34 -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 h23sm19030072ljg.17.2019.08.08.10.50.33 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 08 Aug 2019 10:50:33 -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: Date: Thu, 8 Aug 2019 20:50:32 +0300 Cc: ECN-Sane Content-Transfer-Encoding: quoted-printable Message-Id: <8272983D-D929-4FDC-9E5F-E6DA69E40E1A@gmail.com> References: To: Dave Taht X-Mailer: Apple Mail (2.3445.9.1) Subject: Re: [Ecn-sane] sce ramp vs threshold 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: Thu, 08 Aug 2019 17:50:35 -0000 > On 8 Aug, 2019, at 7:17 pm, Dave Taht wrote: >=20 > My original understanding of sce was that a threshold function = sufficed for fq, and a ramp was needed for single queues. Is that still = the case? It's more the case - as it always has been - that a threshold function = suffices as the minimum functional implementation, but a ramp function = performs better even with FQ. With a ramp, it is possible for the cwnd = to stabilise *at* a balancing value rather than oscillating around it. We're still exploring the solution space for single queues. A ramp = function might not be the best option there, but the kinked ramp shown = in the slide deck seems to work okay when correctly tuned. - Jonathan Morton=