From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-lf0-x235.google.com (mail-lf0-x235.google.com [IPv6:2a00:1450:4010:c07::235]) (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 0FA263B2A4 for ; Sat, 23 Dec 2017 16:20:41 -0500 (EST) Received: by mail-lf0-x235.google.com with SMTP id r143so34783362lfe.13 for ; Sat, 23 Dec 2017 13:20:41 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=0vznYHpdhzSVIXmQDIJeEj7FvyhZHX8Se3nSe/GFnR8=; b=LlEaDBmpdmqfbY6aKNfG98BCo+DA7BbFoEjST7IWcDMMuU7boGG06kt9YKR/t6Qsvz QfZbdm/4u8qITfpRhEgETpYylffkF6byVVhq87frU1bvTzBNL+g2VyJPJu0xaxLSlhax ZMkB0bhGDvzoEphHmuXQtn6IWTi19KafPU+TUnp40c15aQvRo6NZsCbG4OsAKKVRH+gT EIl2TyJ5+Q/elGPBq+FYDPWzcf/Z3wykYG+7XXDEXZTu6mmz/SDUNoVzWS8C9Lo/Ls3G 9kPsV7zzfg0z7EkNUJNq8panTjYwsDWS/lIKCe09XyGFF3i0jPQlWvABE2WPBkazBIdN FfCA== 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=0vznYHpdhzSVIXmQDIJeEj7FvyhZHX8Se3nSe/GFnR8=; b=q+n5BCRhHgNNqh+nJ1ioXvmVveoHqM5rQGuLE5/wXYBCoHUvUaEnmYdUJD8U6S+IuT gGxnp0GB+loN6KkhBeOmK/32rVxPHJOLLyFH5w5hC/rvUkdQ/4+Xnqk/y+BAM8IM7YTK 0C+nJR7kmm4fdILBE121ByNbkQvPqxwNmv3sXIY7aFQmNLCBCIcidjY0GgEN8JG5svee U2JEuE6ZDNIt7EueyJPq1JATsfgtM0830v5A2wi7eEGYxkfOMT7FFUDEcEYELE8jgMxp 8xcA+UfP6bvbUr+RArUDVhoffyviOryjsT0LdExAJVGLYHHCAyusF8KpkKblZmx5KfhG CWWA== X-Gm-Message-State: AKGB3mJXgIyEECgQ6dVtBHl84axPGdv5wgj6ViCN1IAWCcwGi/kJBh0V 01Lz8XYhk/te3ObA80CnyPk= X-Google-Smtp-Source: ACJfBouWwbWVSbfOVm0Aeyw8Fg8ua3DBAQj03BT4ltWjYM6Za+cWL4cjRWOAYZmiLcLhV22BEbaU+w== X-Received: by 10.25.90.200 with SMTP id y69mr10657101lfk.44.1514064040937; Sat, 23 Dec 2017 13:20:40 -0800 (PST) Received: from [192.168.239.216] (mobile-access-bceee7-52.dhcp.inet.fi. [188.238.231.52]) by smtp.gmail.com with ESMTPSA id q142sm5348221lfe.94.2017.12.23.13.20.39 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sat, 23 Dec 2017 13:20:40 -0800 (PST) Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 11.2 \(3445.5.20\)) From: Jonathan Morton In-Reply-To: <7416D2DC-A95B-40EA-B7AB-000BF9D113F8@gmx.de> Date: Sat, 23 Dec 2017 23:20:38 +0200 Cc: Ryan Mounce , Cake List Content-Transfer-Encoding: quoted-printable Message-Id: <06C096E1-F56D-47B9-9D76-1FF981755F80@gmail.com> References: <31d49a5d-02a2-3dc8-a455-52d453b83bdf@gmail.com> <3b255661-1b16-cc29-958f-bbbedbcbab9e@gmail.com> <8FB76CCB-1AAB-42F6-AEF8-D0D8A438EA91@gmx.de> <7ca86dce-7645-38e8-df4e-148245e9991c@gmail.com> <3B4D3F22-DA08-4A8A-A1E2-C31A2B627727@gmx.de> <7416D2DC-A95B-40EA-B7AB-000BF9D113F8@gmx.de> To: Sebastian Moeller X-Mailer: Apple Mail (2.3445.5.20) Subject: Re: [Cake] overheads or rate calculation changed? 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: Sat, 23 Dec 2017 21:20:42 -0000 > On 23 Dec, 2017, at 11:03 pm, Sebastian Moeller = wrote: >=20 > just had a look for hard_header_len in the linux kernel: > linux/include/linux/netdevice.h: > * @hard_header_len: Maximum hardware header length. > * @min_header_len: Minimum hardware header length >=20 > this seems to corroborate our observation that hard_header_len is not = a veridical representation of the actual hardware header length, so I = assume the values cake returns are actually true. It also indicates that = except for pure ethernet interfaces hard_header_len is _not_ the right = parameter to evaluate for what cake is evaluating it for... I'll keep that in mind for my review pass. - Jonathan Morton=