From owner-freebsd-cloud@FreeBSD.ORG Thu Mar 12 20:38:02 2015 Return-Path: Delivered-To: freebsd-cloud@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 665AC73C for ; Thu, 12 Mar 2015 20:38:02 +0000 (UTC) Received: from out1-smtp.messagingengine.com (out1-smtp.messagingengine.com [66.111.4.25]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 3306885D for ; Thu, 12 Mar 2015 20:38:01 +0000 (UTC) Received: from compute5.internal (compute5.nyi.internal [10.202.2.45]) by mailout.nyi.internal (Postfix) with ESMTP id 8465320945 for ; Thu, 12 Mar 2015 16:29:35 -0400 (EDT) Received: from frontend2 ([10.202.2.161]) by compute5.internal (MEProxy); Thu, 12 Mar 2015 16:29:37 -0400 DKIM-Signature: v=1; a=rsa-sha1; c=relaxed/relaxed; d=fastmail.fm; h= x-sasl-enc:from:content-type:content-transfer-encoding:subject :message-id:date:to:mime-version; s=mesmtp; bh=oSljjNuCNUqhH/Qkd DaytQDm1f4=; b=f2QdUmDJVTBuTdkBlchHiURIJvcxrpzr5xRQxYLDGzuBtugkn woXTPYb8J3wi71f3BDz2geWt+YevttXr4bASUIx22K+9kb1+rdap0qpWmoksd3Gp Odh30grU9OA/ft/kenr6D/KwGcosIDNTxcSdCXYvy8bgFdoWcypIC21U2c= DKIM-Signature: v=1; a=rsa-sha1; c=relaxed/relaxed; d= messagingengine.com; h=x-sasl-enc:from:content-type :content-transfer-encoding:subject:message-id:date:to :mime-version; s=smtpout; bh=oSljjNuCNUqhH/QkdDaytQDm1f4=; b=gwI VCZOz2q39JEvRF/gB813kCCIWpZDKqkeeozXZxvuYLxl+rZ/zaQiWysG4uecWWVr QakHWkmOIWPZVjWvzC00oNpA2M7vdhMkTTLyE61hpl3qYksimXTITCgmlQBYlOs2 6J7H3bcwVH4/mIYASJca9LsluwqoM6MGLvQdtxcE= X-Sasl-enc: PJLHQn8Nb2fBiq9x62Rfi80s2llzcU1fZuGC4PtvW/RU 1426192176 Received: from [192.168.0.5] (unknown [84.212.193.93]) by mail.messagingengine.com (Postfix) with ESMTPA id CCDB26800FC for ; Thu, 12 Mar 2015 16:29:36 -0400 (EDT) From: "Bradley T. Hughes" Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable Subject: FreeBSD/EC2 - MTU on xn0? Message-Id: <708D692E-ED5D-421F-94C3-1984B95E0296@fastmail.fm> Date: Thu, 12 Mar 2015 21:29:35 +0100 To: freebsd-cloud@freebsd.org Mime-Version: 1.0 (Mac OS X Mail 8.2 \(2070.6\)) X-Mailer: Apple Mail (2.2070.6) X-BeenThere: freebsd-cloud@freebsd.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: "FreeBSD on cloud platforms \(EC2, GCE, Azure, etc.\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 12 Mar 2015 20:38:02 -0000 The AWS EC2 Instance Types documentation[1] says that the MTU for the = network interfaces is dependent on the instance type. A post on the AWS = forums[2] by an AWS representative states that the MTU configuration is = available via DHCP. I noticed that all of our T2 instances running FreeBSD have an MTU of = 1500. After searching around a bit, I found this patch[3]. I get the = same results when running the reproduction steps in EC2, despite = ifconfig(8) saying it's using an MTU of 9001. I'm wondering if the patch in 187094 is what's needed to make the xn0 = interface on our FreeBSD instances use jumbo frames? Thanks in advance :) [1] = http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/instance-types.html [2] https://forums.aws.amazon.com/thread.jspa?threadID=3D143674 [3] https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D187094 -- Bradley T. Hughes bradleythughes@fastmail.fm=