From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mout.gmx.net (mout.gmx.net [212.227.15.15]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.bufferbloat.net (Postfix) with ESMTPS id 67FD93B29D; Sun, 25 Jun 2023 04:43:10 -0400 (EDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gmx.de; s=s31663417; t=1687682588; x=1688287388; i=moeller0@gmx.de; bh=MsXcB5dsQ8WSY1qOtL1GYXTmNNwduF0m3xrZa5tGvIU=; h=X-UI-Sender-Class:Subject:From:In-Reply-To:Date:Cc:References:To; b=X+BWr0RIS8hu+CG/G7UvMm3KZoqwXFim/CPEHRcIWHOR8czoTyvFhsLVbd67gRN08AR5p/d dSQ9mgliZPRfuNC9Ve32+Kl+7b7eBH5lGj81qAMH7hMOhEOZX7XprFJewskZVF/+mRaH587wO 10GtsiprFI2cqeDqs9QjIlAzEODS+77UqdWxBp64oSVkTRstUZzy1swJ1wm1IwCsdiJb3IyDJ ropmQJLNA4O1Za17dmSwXtIB5ABK0w3fSCj/XGKptbR51YSylUHvaV8HK6I2VFJbRSE3lgWDz ZsHPAOfsd5ULu3RywLK7bWXLJl2eSYh6ARERRTgGL1ef0m5Ex/cA== X-UI-Sender-Class: 724b4f7f-cbec-4199-ad4e-598c01a50d3a Received: from smtpclient.apple ([77.3.0.223]) by mail.gmx.net (mrgmx005 [212.227.17.190]) with ESMTPSA (Nemesis) id 1N2V0H-1q4Z5n1t0R-013wiU; Sun, 25 Jun 2023 10:43:08 +0200 Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 16.0 \(3696.120.41.1.3\)) From: Sebastian Moeller In-Reply-To: <46B3DF93-48F1-429C-B9E0-41683CBBE1E8@gmail.com> Date: Sun, 25 Jun 2023 10:43:07 +0200 Cc: ECN-Sane , Cake List , Jonathan Morton via Bloat Content-Transfer-Encoding: quoted-printable Message-Id: <27C08679-D769-4FA6-B088-F8FD138AAA73@gmx.de> References: <24D1A566-DFE9-4FDF-86A2-CFB30F20FCB2@gmx.de> <46B3DF93-48F1-429C-B9E0-41683CBBE1E8@gmail.com> To: Jonathan Morton X-Mailer: Apple Mail (2.3696.120.41.1.3) X-Provags-ID: V03:K1:cmzy4G+ddmUD61KuxGB26im2dY/2yZHbGGN0cCUa9/RaAC9kQP1 GsJQGJmzU/eAOmA5jV+9LJ3HMEqYZofEzWZoMdQuYd81LkHRr7q3yHWbcyVcvEssI/WUmra nRDcgQXb4yNveJAMd17x1mT/lqJjw/Qw3sqPp5tDenuL3ooMm1ZIwEiSZFNSA+uunKxQ8zK 93m/+SvgnJkRHe9fa5rrA== X-Spam-Flag: NO UI-OutboundReport: notjunk:1;M01:P0:YhBkYYVx/9Y=;rULcKp25eS43nFf4CGOp2ZnQviW kxrUjNnfFqQHOumSwxQNMwbRsuy2BV4PSJHPBjp8L/+rLcM2ASB2xi6NiDK+VxYzAAi3V30Ec rKhKorCaTAbENNKDak0lQjq+3Tuo+qeyTkUsrBujPjrbCLNRJ7gNSV0+TV8Pq1+Jv7aVZQTNg EIanUrkDCPs8uNag0Qn1/TgJ+l0WuvqTzuBetXQu348sexVLvJhV0vSKK1heya552vNzhR5Z0 p55RQFk+5iEZYLfbiR7zajqbSEw5PwZA7AgV1xv7RQASx04HWP3UcPr43ik4CwYWZ3s+a4G0T NEW5b65eG1Y/EtUnOjJrWY836PpkLwtTxPJ9Yb5ZZ/doJOY5FcQXjtNaemJ6LzO8+G1VhYKoS IGHWbddEsZ4UH7K0mvZvEkRZiH+Dlv9Zxls/i/GRE68mrJg364qhV34upvX8+FvXUVp1NREld aW42eMQjQzRbksnuWD5C5atpCzS6Dm0G4gnptQ/64PGxSXB81D/5WnyppydRiE5VAX6SZgV1v cOkTFiTEK2ecta68m9PUkLZQawZJGak75L51Zz1xY6a50IUveR9uDmpxpaUT6EUgMKWOm3WBQ CsSuw9oUz8pjxXINs5mbtbPsiteQPD7XCNk2FzDkT1wzI+sM/L9eyrXqTqTpS6aq7Ls42m9+u Hc35qbI5goxWUTa9qoEAYMpY9bdcGOXVzUeKme2s4+Ncwaedb2FtRK8eJGXj46/p6IDiln30X xOywhKklSnu5sxobKL96dnrM/70YMladhwL9nSOk9h41ffNonn/NYt3+o6MIt2rAPhRH4zkSz YKNm5V6fLy35tJ+zQmjJYj8cN9qIdFJmA2ebyJUTE2aI8zaV22rrhdBlaG1S/FwpCsDSbKTq2 +vV+31UTwWonOuLSTx7USEBo29g1NtDdS3Hee9lOf7lqFrhbLVqL5Ntxf/otoQVthajpR15sO TGtbug== Subject: Re: [Cake] Anybody has contacts at Dropbox? 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: Sun, 25 Jun 2023 08:43:10 -0000 Hi Jonathan, > On Jun 25, 2023, at 01:04, Jonathan Morton = wrote: >=20 >> On 25 Jun, 2023, at 12:00 am, Sebastian Moeller via Cake = wrote: >>=20 >> Is dropbox silently already using an L4S-style CC for their TCP? >=20 > It should be possible to distinguish this by looking at the three-way = handshake at the start of the connection. [SM] Great idea, just need to google how to restart the dropbox = client to force a new handshake. > This will show a different set of TCP flags and ECN field values = depending on whether RFC-3168 or AccECN is being attempted. Without = AccECN, you won't have functioning L4S on a TCP stream. >=20 > But I think it is more likely that it's a misapplied DSCP. [SM] Probably... Thanks & Best Regards Sebastian >=20 > - Jonathan Morton