From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932952AbeCSM47 (ORCPT ); Mon, 19 Mar 2018 08:56:59 -0400 Received: from vegas.theobroma-systems.com ([144.76.126.164]:60516 "EHLO mail.theobroma-systems.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932831AbeCSM44 (ORCPT ); Mon, 19 Mar 2018 08:56:56 -0400 Subject: Re: [bug, bisected] pfifo_fast causes packet reordering To: Paolo Abeni , John Fastabend , Dave Taht Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, "David S. Miller" , "linux-can@vger.kernel.org" , Martin Elshuber References: <946dbe16-a2eb-eca8-8069-468859ccc78d@theobroma-systems.com> <95844480-d020-9000-53ef-0da8b965ce6e@gmail.com> <3a959e50-8656-5d9c-97b9-227d733948f8@theobroma-systems.com> <5aeb54ba-2d96-4ab5-53c4-2d3691be7acc@gmail.com> <340a6c54-6031-5522-98f5-eafdd3a37a38@theobroma-systems.com> <1521462750.3059.12.camel@redhat.com> From: Jakob Unterwurzacher Message-ID: <5468f8eb-17b6-9000-ab4d-a2c67ef35e4b@theobroma-systems.com> Date: Mon, 19 Mar 2018 13:56:47 +0100 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:52.0) Gecko/20100101 Thunderbird/52.6.0 MIME-Version: 1.0 In-Reply-To: <1521462750.3059.12.camel@redhat.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 19.03.18 13:32, Paolo Abeni wrote: > Is not clear to me if you can reproduce the bug with the vanilla > kernel, or if you need some out-of-tree nic driver. Can you please > clarify which NIC/driver are you using? Yes I reproduced it with a vanilla kernel. I use two off-the-shelf USB NICs, lsusb says: Bus 005 Device 013: ID 0b95:7720 ASIX Electronics Corp. AX88772 Bus 005 Device 014: ID 0b95:772b ASIX Electronics Corp. AX88772B Photo of the setup: https://github.com/jakob-tsd/pfifo_stress/blob/master/usb_nics.jpg Best regards, Jakob