From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mout.gmx.net (mout.gmx.net [212.227.15.19]) (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 78A503B29E for ; Sat, 4 Nov 2017 09:36:55 -0400 (EDT) Received: from [192.168.10.50] ([93.233.79.61]) by mail.gmx.com (mrgmx002 [212.227.17.190]) with ESMTPSA (Nemesis) id 0McEkx-1dsUGv0byh-00JdPv for ; Sat, 04 Nov 2017 14:36:54 +0100 To: bloat@lists.bufferbloat.net From: Matthias Tafelmeier Message-ID: <3f789193-f491-8313-5f10-ef1bf73684f2@gmx.net> Date: Sat, 4 Nov 2017 14:36:53 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.2.1 MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha384; protocol="application/pgp-signature"; boundary="UWnG87sJhGmCONBdxlN0sQBdX3a8hxFe7" X-Provags-ID: V03:K0:xDSEt3q35CDHilwLVC57Unz9NcTFoouW2b9Avdjw6UAL0HgtRfx BwR6apQ0KtiRzmpGUo0B97h4SpPoGxIiEMHbzKL9/Hdv59PH0pUXEEZYrM7+gnN/XCqPFSE QDK5X0yE4EidaDphnTOYamzHlT8ClC9JmNwBU0vpONGaTcTul5Uome0oOsfnpZsp96AENs8 0xDXwMl1OAd+QBR99rBoQ== X-UI-Out-Filterresults: notjunk:1;V01:K0:3Hdw6oEQxnQ=:spTJuz5VR02SVCUqKwT8Mt Qh4noHCf9oai5owPeiTTMcl+jzGCVUdVr6qPEcl3z8LGkvTFKNdSFQxfkDZExMLS2CZprhZPJ UfFEsgXauW6URzELo7ET8Hp24YyQLYvObEZG4Y4HQI5FbXckNeaNczvji1j7WUE0lvV3aFOLs DwoGJ4hFx1HOvlbh2mJlfkAooOS616h7MZWNDK79n80ZFTzPCoGSmBeF0qO6ZsBIfPgxmkl98 dMclY1D0dp2WuraQiUFUYeFOZU33wWq6eR3a1deJ1QfEcjnhZMPQ/WMCPMGBvdLCF/SWf1FwM znFLpwtQ+7NoKDa1zo5mrP2h1iAP3ON9ROJWWPu+WFPSKwV6W6bIoUe0AeAAY9BvFZxMW58mF eHsapW89BrbffloATWLhP78Pn5li9S8+2vgWzKkygbzV+WCr/KMNyy2nl79sAbQCyC91iVIUo 1wBN5tutHqja9G20YGNt+tp68BBkhV15zSmdSVZdAqIUuNHnYfriNQnrFn4VExj5CN5ydp8eP LoDq+0iS1z8/POtrtWEoRNiT3A+eDnEUcFKYRU69XcUo07PTt7KaOLeT+sTrJiZJW3GWTolDA jU5gdxGZc1HKtN2gNisqdVTU2agx23rnvVPs5vAs95KNL7aFzNEpq0/jzbLkJ+tXlbkkB8fdA WSvc3ktP3oUeJwK0jMEAxZ1YDTm2DOjy2viP43rwGoEcQQomeyF61YYAsIeSDgTrF66DWoNTl UBfpa1rjyhlcS4qEypqcf/xwXZamjApqcTjwOjB8EzgoT4CjDPlAjopDV5BWmJNxQ4bcd/+Jn rseBnyZ6JTsGWO0yZgRXwZ2sqAk4Q== Subject: [Bloat] generic tcp - window scaling limits X-BeenThere: bloat@lists.bufferbloat.net X-Mailman-Version: 2.1.20 Precedence: list List-Id: General list for discussing Bufferbloat List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 04 Nov 2017 13:36:55 -0000 This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --UWnG87sJhGmCONBdxlN0sQBdX3a8hxFe7 Content-Type: multipart/mixed; boundary="hnejdfIVk96dxwfsM59TudfF7Fk6Q6VbH"; protected-headers="v1" From: Matthias Tafelmeier To: bloat@lists.bufferbloat.net Message-ID: <3f789193-f491-8313-5f10-ef1bf73684f2@gmx.net> Subject: generic tcp - window scaling limits --hnejdfIVk96dxwfsM59TudfF7Fk6Q6VbH Content-Type: multipart/mixed; boundary="------------0A4AA42B49018A2BB4B3512B" Content-Language: de-DE This is a multi-part message in MIME format. --------------0A4AA42B49018A2BB4B3512B Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Hello, before bringing it forward to LNX netdev and with the risk of restating something, I wanted to hearken for the take of this here, since it's also bloating related - when looking at it from the link clogging/flowyness point of view. I first surmised some DQL (as done for driver rings - BQL) introduction to the TCP hard limit could improve perceived flow latency - though the current hard limit is perfectly enough in conjunction with the window advertisement/scaling. As of what I measured here https://matthias0tafelmeier.wordpress.com/2017/08/24/linux-tcp-window-sca= ling-quantification-rmemwmem/ it rather appears introducing a kind of per socket settability of the advertising hard limit maybe organized on a link/receive side realm (be it a subnet or a flow group) for performance can improve the scene. Sure, it's not possible to align both ends (RCV/SND) always, but for the back end world and therefore as a general statement it should hold true. 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