From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-lb0-x244.google.com (mail-lb0-x244.google.com [IPv6:2a00:1450:4010:c04::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 8C0B13B2A0 for ; Sun, 24 Apr 2016 16:45:57 -0400 (EDT) Received: by mail-lb0-x244.google.com with SMTP id b1so4195885lbi.3 for ; Sun, 24 Apr 2016 13:45:57 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=iXHQChVnTkUivBgV/+aUxkYTiKMU6Wk7mhfk5Jf7A50=; b=MFejumHQ1f2WH6Cq8T4R3HeywItprFuhoP9zGCCZDIlGlDVPiITeOn6c/eu61AtOjM ngtwGH6rV/HS4WFgoevNr8NiV9hIJ5nuAcTPmiqcSEIqhdtJdPzyH3bGl9ytKFc6jPrV +w33vtMBlv526QWQCUOrMmLFruPkT94bpqznHx/7ppvN0/d8OUyI+Qdibd5DbSurUcjA s4Z/ozHw6bgNz1UtVRAvuwmbdrhNAi/nZkWQjxDRWmPODQcxp1suuiZ9xc/mdJmGEV0D jqoisutNzLCbBj3enlpLcW6RUPdz7jUNmW7yAxcPUp+9gmyIdWD9QXvkhscV0O3oteNR fxMg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=iXHQChVnTkUivBgV/+aUxkYTiKMU6Wk7mhfk5Jf7A50=; b=PH65oUfPNCoQEqfd5CFcSTlUP/a65XTcj/45ZOhGEM/DiR7/tsQmCfggC6RbcLAwgm WE7kwTu3B30xg3UEHI6//r9ffA6qZzcxNKjK9ZpKH87dQ7V2jkKp7p51ZzKagYHqrX70 giEOuDzs9hYWrfpT5CA0Ma29hiPAlyRitI4ZAEFL3D4ZX4ZyNd2gvcuD/Uth4i4/aSC7 W0ELptph6akNyZh4NMupn2aKEc1f49ltpaFlLFn0mbUy954+mdhGLQ2756LQ/FYInnbK afFvlEhsLe9D01PaUI3z6zo6esgHPc+Eqw3HXNimm4hZnCisHY64FAL4QhOy8Yqs1A4f KJGw== X-Gm-Message-State: AOPr4FUNjns+eeYMVreerh6qXsH3EWXJJBRLROLa1ijjEJEIi/fHtTH9nmVhOVCEkJd5ew== X-Received: by 10.112.169.65 with SMTP id ac1mr2509742lbc.92.1461530756262; Sun, 24 Apr 2016 13:45:56 -0700 (PDT) Received: from bass.home.chromatix.fi (37-33-67-252.bb.dnainternet.fi. [37.33.67.252]) by smtp.gmail.com with ESMTPSA id h124sm3801518lfh.7.2016.04.24.13.45.51 (version=TLSv1/SSLv3 cipher=OTHER); Sun, 24 Apr 2016 13:45:55 -0700 (PDT) Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 9.3 \(3124\)) From: Jonathan Morton In-Reply-To: Date: Sun, 24 Apr 2016 23:45:45 +0300 Cc: cake@lists.bufferbloat.net Content-Transfer-Encoding: quoted-printable Message-Id: <249A79A8-D229-403B-A21E-72C57A012C6F@gmail.com> References: To: Dave Taht X-Mailer: Apple Mail (2.3124) Subject: Re: [Cake] perhaps a performance optimization 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, 24 Apr 2016 20:45:57 -0000 > On 24 Apr, 2016, at 18:44, Dave Taht wrote: >=20 > thought: since it takes two data packets for tcp to release an ack, > perhaps it is better in some circumstances (notably with offloads > enabled) to peel at quantum * 2, > still delivering packets with a quantum (with a max of a mtu), so that > delivering two unpeeled packets would cost that flow a DRR round, but > save a lot on peeling overhead. If a GSO packet is less than an MTU in total, surely it=E2=80=99ll peel = into a single packet anyway? I don=E2=80=99t see where the gain is. - Jonathan Morton