From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-il1-x12b.google.com (mail-il1-x12b.google.com [IPv6:2607:f8b0:4864:20::12b]) (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 9B8BD3B2A4 for ; Tue, 9 Mar 2021 14:20:34 -0500 (EST) Received: by mail-il1-x12b.google.com with SMTP id p10so13208870ils.9 for ; Tue, 09 Mar 2021 11:20:34 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=sSWtSu7YsAMpiSQpsbsVjNBfOpQAos+Di0INcI1Wy3s=; b=JrhYFfUdLmTGpirBxitMgvcsM8+ZgDWYT5EHcy2KMfZ2aGlXTOtuJAgxp/ue4H8cyf hjRi7LelveJleSBVHkIQLAag5buG4/jdEZdCs+JlY8RP0lXttvjicrgM87kE7r5IdE1x ccDalYJcz0r97Rneb8k6uy65u3w3QBEpV8Vgnh2dMANovrC3AHkLFSDmF0LA7HhnSRGI moZqk/i9uyEoo8pJE/2ZdjItuSe57BPL9mT2D/AKyYRD9l/T2M3IqnhQWU9T/Iwzu8mx a8QHCeEtJMhcHkmPPXex5TWnI781mJU1gh0kIRG1aX4lLkq2e925iWV639ss4jd2DFuW TE3A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=sSWtSu7YsAMpiSQpsbsVjNBfOpQAos+Di0INcI1Wy3s=; b=DH1Zk7fWLHqMuQ5lkJZZgY/RO9sTIisNiRBGHTlB44LAa58rNwp/ygLxZEinoWntcl TdCKhWtzt3qsVsqvEXR0Hl10B4N7ypi47z4uXLQfsaeHJ1+C+rngqX0UKE4Ki71b4EoH WtPn5ux4rFyES4Y+ve+XXm2l4AR4h7zdChQbae3zv++k5pXTLdVKzBEcoSST5Jl6gMrZ TjxpM8Ty+x1V0/709+kvnsAcJJ/lxXRPsSHxyLjmuwfEht4WA0zzJIvKIxrtQCCA1c71 33Td5TqP9HhMht8lVGrtDgnmJ3C0WKatMrWMT4mKuQzlwNF1FBQEbMEmwW6DGc0erPRs 468w== X-Gm-Message-State: AOAM533B+gMejvU/N5tmI1hZFJwdzj5EDwmBz7Cb84HB/o7sntkW0jG9 iSfpGzb2wwtfEbkbc929tgtMRx1REJwDFvD8Z68= X-Google-Smtp-Source: ABdhPJyqxNaFqmghw37xZmuvXa/D3hWZh0L2ai2hgVG8NEYcJKQbNQ30pSCRMbMGWeMyII/hgD5mKuTtuHLw+wtICLI= X-Received: by 2002:a05:6e02:f06:: with SMTP id x6mr23575010ilj.287.1615317634045; Tue, 09 Mar 2021 11:20:34 -0800 (PST) MIME-Version: 1.0 References: <202103091519.129FJBQg077653@gndrsh.dnsmgr.net> <96258C16-D03C-44F0-AFC8-3403F6866FF7@gmail.com> In-Reply-To: From: Dave Taht Date: Tue, 9 Mar 2021 11:20:22 -0800 Message-ID: To: Jonathan Morton Cc: "Rodney W. Grimes" <4bone@gndrsh.dnsmgr.net>, ECN-Sane Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Subject: Re: [Ecn-sane] A brick wall threshold for SCE_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: Tue, 09 Mar 2021 19:20:34 -0000 On Tue, Mar 9, 2021 at 10:58 AM Jonathan Morton wro= te: > > > On 9 Mar, 2021, at 8:48 pm, Dave Taht wrote: > > > > I do not think anything other than a brick wall can be implemented in h= igh speed hardware. > > We've spoken to a Cisco guy who says they can already do Approximate Fair= ness at 100Gbps per port. That's our benchmark. I have long wondered how much of AFD they were selling. > > > I really wish you'd try a brick wall > > We did. We didn't like the results. But you did not try a bbr-like approach. Observe a mark, and the rtt inflat= ion. bbrv2 works pretty decently with CE_threshold already. making it work with a brick wall SCE made some sense. > > - Jonathan Morton --=20 "For a successful technology, reality must take precedence over public relations, for Mother Nature cannot be fooled" - Richard Feynman dave@taht.net CTO, TekLibre, LLC Tel: 1-831-435-0729