From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752117Ab3FZBMj (ORCPT ); Tue, 25 Jun 2013 21:12:39 -0400 Received: from shadbolt.e.decadent.org.uk ([88.96.1.126]:53872 "EHLO shadbolt.e.decadent.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751401Ab3FZBMh (ORCPT ); Tue, 25 Jun 2013 21:12:37 -0400 Message-ID: <1372209146.4006.35.camel@deadeye.wl.decadent.org.uk> Subject: Re: Per route MTU settings are broken in linux kernel 3.2 From: Ben Hutchings To: Yura Pakhuchiy Cc: linux-kernel@vger.kernel.org, netdev , stable@vger.kernel.org Date: Wed, 26 Jun 2013 02:12:26 +0100 In-Reply-To: <1372079315.32157.15.camel@linux> References: <1372063443.32157.10.camel@linux> <1372077951.21189.16.camel@deadeye.wl.decadent.org.uk> <1372079315.32157.15.camel@linux> Content-Type: multipart/signed; micalg="pgp-sha512"; protocol="application/pgp-signature"; boundary="=-3pqCePKAFTA6m7+Icio4" X-Mailer: Evolution 3.4.4-3 Mime-Version: 1.0 X-SA-Exim-Connect-IP: 192.168.4.101 X-SA-Exim-Mail-From: ben@decadent.org.uk X-SA-Exim-Scanned: No (on shadbolt.decadent.org.uk); SAEximRunCond expanded to false Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --=-3pqCePKAFTA6m7+Icio4 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, 2013-06-24 at 20:08 +0700, Yura Pakhuchiy wrote: > On Mon, 2013-06-24 at 13:45 +0100, Ben Hutchings wrote: > > On Mon, 2013-06-24 at 15:44 +0700, Yura Pakhuchiy wrote: > > > Hello Ben, > > >=20 > > > Looks like setting per route MTU (as described in [1]) is broken in > > > Linux kernel 3.2. I tested with newer Ubuntu kernels 3.5 and 3.8 and = it > > > looks like problem is fixed there. I filled Ubuntu bug report [2] wit= h > > > more details and sample script which illustrates problem. But since t= his > > > problem is probably also present in stock kernel (not just in Ubuntu)= , > > > is it possible to backport fixes to stable 3.2 series? > > >=20 > > > 1. http://lartc.org/howto/lartc.cookbook.mtu-discovery.html > > > 2. https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1177507 > >=20 > > Sure, what are the fixes? >=20 > Actually, I do not know :-( Ubuntu devs have not fixed this problem in > Ubuntu 3.2 kernel. But these commits in mainline kernel looks related: > https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/comm= it/?id=3D9b04f350057863d1fad1ba071e09362a1da3503e > https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/comm= it/?id=3D5f2d04f1f9b52604fca6ee08a77972c0df67e082 > https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/comm= it/?id=3Dd851c12b60471188e15e5c8405b289073e8dd025 > https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/comm= it/?id=3D7f92d334ba19a0d8e96f8f8f092219553367d921 > https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/comm= it/?id=3Dee9a8f7ab2edf801b8b514c310455c94acc232f6 > https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/comm= it/?id=3D38d523e2948162776903349c89d65f7b9370dadb > https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/comm= it/?id=3Dfa1e492aa3cbafba9f8fc6d05e5b08a3091daf4a > https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/comm= it/?id=3D05ab86c55683410593720003442dde629782aaac > https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/comm= it/?id=3D9cb3a50c5f63ed745702972f66eaee8767659acd > https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/comm= it/?id=3Db44108dbdbaa07c609bb5755e8dd6c2035236251 >=20 > However I'm not sure whether they all are required or sufficient to fix > everything correctly. Sorry, but I really do need someone to tell me exactly what's required. I'm not likely to find the time to work this out myself. Ben. --=20 Ben Hutchings Knowledge is power. France is bacon. --=-3pqCePKAFTA6m7+Icio4 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: This is a digitally signed message part -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQIVAwUAUco/+ue/yOyVhhEJAQpBsxAA0Wxus9cvoZxfoOSi10wa2d+MvbqYihkh cEZl0XllDIrx7f//FCzxBaVWzosJjaE05DSPFUaOTmAcgQaaftK3QzQKA1QIqqTa WhFvQbwsxt9RWRZbev43V/WaV/cMjdF5Y+j2Qm1fI639EF2QuAksgE+jn0aEbsAh 1OXz0GHVFg0i0pYh+UyqRxJg+FUtLKfc85Cak6b6F/q/PXRI1cwyYxYYIdUfuf/x WPE6m4efMS7I6w3A7+GaFZzrvj/5lVeAKuxvLlpuPBGHJHgwd0H3KateyZtiib7o yBvIL/UiJTehV17a/W1FUhBsas5q3whTWHBRLl2D1TpvX7X8THly6nnByF4La+xL rS3bqY/R0jq8QcAaPIlMm4yi1UIg+t8NDcjjWQQdBASev10Uu5Bwb9hpxa6D2yJn kzqlECX7dz+FtyJwaCIkxsfoA41za56KMh4cJtVXmgTHxD/6gZGDRy5MkUZQ/flr 7xJAnC+DpRPyBWtQa266N/ILW4MTGa0Wz4vQpEBufg1tV1+57N0WATMDcXBnOIOa QGuR8X9TvIB0VfN52IFI4zH6sExxuzAtXm9d4Jlr50rbuDM+mcSCngfWJj72hw40 E8ztTB0xLs0cpkcff108+cYxP4EYqz0LA2ZLlqUNZyaNjkz8ekDDUdh1rMwDCDtn sboaNXDwbns= =W0jS -----END PGP SIGNATURE----- --=-3pqCePKAFTA6m7+Icio4--