From mboxrd@z Thu Jan 1 00:00:00 1970 From: Patrick Boutilier Subject: Re: Extreme slowness in IPIP tunnel when routing through kernel 3.18 and later Date: Thu, 17 Mar 2016 18:13:23 -0300 Message-ID: <56EB1DF3.5000606@ednet.ns.ca> References: <56EAB8F3.7060802@ednet.ns.ca> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="------------090905020102050904020005" Cc: Linux Kernel Network Developers To: Jesse Gross Return-path: Received: from staff.ednet.ns.ca ([142.227.51.33]:45478 "EHLO staff.ednet.ns.ca" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1030395AbcCQVNZ (ORCPT ); Thu, 17 Mar 2016 17:13:25 -0400 In-Reply-To: Sender: netdev-owner@vger.kernel.org List-ID: This is a multi-part message in MIME format. --------------090905020102050904020005 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit On 03/17/2016 03:27 PM, Jesse Gross wrote: > On Thu, Mar 17, 2016 at 7:02 AM, Patrick Boutilier wrote: >> I have an IPIP tunnel setup between two hosts in different buildings. The >> Linux router they route through causes extreme slowness in the tunnel when >> running kernels from 3.18 on . tcpdump shows many cksum errors which don't >> show up in the 3.17 and earlier kernels. Speed goes back to normal when >> rx-checksumming and tx-checksumming are turned off using ethtool on the >> Linux router . Would this be an effect of bulk network packet transmission >> that was introduced in 3.18 or some other issue? > > I just sent out a likely fix, would you mind testing it? > https://patchwork.ozlabs.org/patch/599213/ > Yes, that patch fixes the problem. Thanks. --------------090905020102050904020005 Content-Type: text/x-vcard; charset=utf-8; name="boutilpj.vcf" Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename="boutilpj.vcf" begin:vcard fn:Patrick Boutilier n:Boutilier;Patrick org:;Nova Scotia Department of Education adr:;;2021 Brunswick Street;Halifax;NS;B3K 2Y5;Canada email;internet:boutilpj@ednet.ns.ca title:WAN Communications Specialist tel;work:902-424-6800 tel;fax:902-424-0874 version:2.1 end:vcard --------------090905020102050904020005--