From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wr0-x244.google.com (mail-wr0-x244.google.com [IPv6:2a00:1450:400c:c0c::244]) (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 613393B2A4 for ; Tue, 24 Apr 2018 03:15:24 -0400 (EDT) Received: by mail-wr0-x244.google.com with SMTP id w3-v6so47618153wrg.2 for ; Tue, 24 Apr 2018 00:15:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=eventide.io; s=google; h=mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=eEKTnaDdYVqDtBVXQl4gPRrfu2jElrJk5nSjiY2MWxQ=; b=Vj3hwPZoYQPY0JLMKNyd33Wny5ZrI0DXGgzk8jFUgKqhYoC6mh7IR/JRWlJbQ/uc+d /OIfuLbb4mhPxwO7oiUkjyoYkYXBS+Y/9QCG/7R6m6glgPCJkY6zFKmnj6H2/WhZ0m+u syZP+2Hv3jNknSSGtefM0F0bmxCNBtGF8TxY3+xtSSOsOrvHBXN/ZXjy7ZgJvAhpAmtG x/OAXtiWmYbarnIivVDbq1QsvBh9s3R/ffHiR3aI67dnzvxRoYo4UaMmMrutzPgSyAu6 wf7/lr+gBab84E88MquBWHuqSrcsrsWMwQCHQRHH49QWIs6IXrXc2IQ4NME+ysa6qRtc rVig== 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=eEKTnaDdYVqDtBVXQl4gPRrfu2jElrJk5nSjiY2MWxQ=; b=LQ3bQZkpzlbPkJq5z1lsQTvZk732spfQfGZppB8pM//LsJiSSuCmLKHHtwyEQhFFFj UgmBLvz9bTbRQDoNcEGzF8MmmXROjyg5lw+/OmTv5BZvIgYJSrc0uY6nv/8+0hFzh/UE RWEKoY0HZZOEyZ9ncZIFcECAPGgAqJYLczhGz7VQQ2QI75i+q4s1cFsGpiS5LMeZkXij FPiaN3R4SCoIEz0hqBmu6212g3ziShakZQi/hINvBV3qgnoryetmYznRDr2i9/AN02Sp Uj0SOTSiFZ+gxDNvsbRT7bCwrx/AWBxAOoPWuq1fE0cCsxLuwMByBPYqYK3YPxGL15Q2 GLjw== X-Gm-Message-State: ALQs6tBVLU8LksdZ5BYpdG2S3AEnygXY7VG1JK4GXS3r3ZOS4r3zB0xG LBGMp9xT3KDiXs5t85kdzQ2v1A== X-Google-Smtp-Source: AB8JxZpsB7o20yfGx1abnrYsm3SuvqaYQGjA7xuLSHSAG9nvKNyWJhmR4IibMq4SVVly/2UhdKJZeA== X-Received: by 10.28.220.84 with SMTP id t81mr8177800wmg.90.1524554123450; Tue, 24 Apr 2018 00:15:23 -0700 (PDT) Received: from [10.72.0.64] (h-1169.lbcfree.net. [185.193.85.130]) by smtp.gmail.com with ESMTPSA id n73-v6sm15289934wrb.18.2018.04.24.00.15.22 (version=TLS1 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Tue, 24 Apr 2018 00:15:22 -0700 (PDT) Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 9.3 \(3124\)) From: Pete Heist In-Reply-To: <311BE3FC-9211-4B33-AD46-444F21E2A38A@gmail.com> Date: Tue, 24 Apr 2018 09:15:20 +0200 Cc: =?utf-8?Q?Toke_H=C3=B8iland-J=C3=B8rgensen?= , cake@lists.bufferbloat.net Content-Transfer-Encoding: quoted-printable Message-Id: <6A13BD7F-D682-4864-B5DB-2352C1C3F529@eventide.io> References: <871sf6xqne.fsf@toke.dk> <003D19B8-73F8-46D4-8FC8-95F6E518D3B5@eventide.io> <311BE3FC-9211-4B33-AD46-444F21E2A38A@gmail.com> To: Jonathan Morton X-Mailer: Apple Mail (2.3124) Subject: Re: [Cake] Pre-print of Cake paper available 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, 24 Apr 2018 07:15:24 -0000 > On Apr 24, 2018, at 7:58 AM, Jonathan Morton = wrote: >=20 > Turning NAT support on by default might actually be reasonable, since = it doesn't really break anything if it's not needed - it just eats a bit = of CPU with unnecessary conntrack lookups. I would be for it, if it eats say < 1% additional CPU, and preferably = less. I expect the impact to increase with packet rates. > For the flowmodes, basically triple-isolate's raison d'=C3=AAtre is to = be a reasonable default which (usually) gives most of the benefits of = the "dual" modes, without needing to know a-priori anything about = network topology. In the most typical application, the distinction can = be seen in whether the qdisc is attached to an IFB or a physical = interface, but in deployments that we'd *like* to see, the opposite = cases easily occur. To do anything more sophisticated, we'd need to = watch some traffic and guess after a while, and that doesn't feel right. Yeah, I see. The same could be done with nat. There could be an = auto-detect phase where nat lookups are performed and not to determine = if it=E2=80=99s needed. But if these detections didn=E2=80=99t work with = near-perfect reliability, it would complicate troubleshooting.=