From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Message-ID: <52DED209.5000207@wirelesspt.net> Date: Tue, 21 Jan 2014 15:01:13 -0500 From: cmsv MIME-Version: 1.0 References: <4577758.QFzZxb72dK@diderot> <52D5B47D.8090406@wirelesspt.net> <52D631FB.9070106@hundeboll.net> <52D66D45.4060301@wirelesspt.net> <52D66DE4.3050300@meshcoding.com> In-Reply-To: <52D66DE4.3050300@meshcoding.com> Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="KgjeSnopfo7BWjj8gmgep57S3EDAM8Xva" Subject: Re: [B.A.T.M.A.N.] batman-adv 2014.0.0 released Reply-To: cmsv@wirelesspt.net, The list for a Better Approach To Mobile Ad-hoc Networking List-Id: The list for a Better Approach To Mobile Ad-hoc Networking List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Antonio Quartulli , The list for a Better Approach To Mobile Ad-hoc Networking , =?UTF-8?B?TWFydGluIEh1bmRlYsO4bGw=?= This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --KgjeSnopfo7BWjj8gmgep57S3EDAM8Xva Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On 01/15/2014 06:15 AM, Antonio Quartulli wrote: > On 15/01/14 12:13, cmsv wrote: >> inline: >> >> On 01/15/2014 02:00 AM, Martin Hundeb=C3=B8ll wrote: >>> Hi, >>> >>> On 2014-01-14 23:04, cmsv wrote: >>>> batman_adv: bat0: The MTU of interface adhoc0 is too small (1528) to= >>>> handle the transport of batman-adv packets. Packets going over this >>>> interface will be fragmented on layer2 which could impact the >>>> performance. Setting the MTU to 1546 would solve the problem. >>> >>> Did you enable network coding? That would explain the message, as NC >>> uses a larger header to make decoding possible at the receiver side. >> Yes it is enabled by default as it was with batavd 2013.4.0 with 1528 = mtu >>> >>> As far as I can tell from a quick look in packet.h, the required MTU >>> should be 1532 now. (10 bytes unicast + 8 bytes extra for unicast_4ad= dr >>> + 14 ethernet =3D 32 bytes). Or am I bad at counting bytes? >> >> Regardless of being properly counted or not; dmesg outputs the message= >> complaining about the need to make mtu 1546. >=20 > If you disable network coding the message will change. >=20 > The overhead is dynamic depending on NC being enabled or not and now th= e > message in dmesg tells you exactly what MTU you need. Yes i understand that but it keeps on increasing. [ 28.600000] batman_adv: bat0: The MTU of interface adhoc0 is too small (1546) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to 1560 would solve the problem. >=20 > Cheers, >=20 >=20 --KgjeSnopfo7BWjj8gmgep57S3EDAM8Xva Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.22 (GNU/Linux) Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iQIcBAEBAgAGBQJS3tIOAAoJENmyd4cVxLOC40MQAJuhYpH5N7Agcr1Cksn/deOb 54ZBJRH7OJb/2bpVA5k9v8n2hehqMnn95Kae7mEor11YjODtntZZEUhIA65VU+A5 ou5YrKTEKvJe1jHxl9tWk64VmWfq62g0Bap2t2TtEZwBFfUmIcmNbcfIgLtC1n0a QRzbAhiKbneOWlcrQU7ROKbw8Anl8ABIE+XxSw8zjtYct7m7VqF/d8HjP4OXB7kn jmvIV9V0gdSLGBnzSbQrimOurMIqHdj277IVbgxuTEo/eYQv/dJZVoGpyIi6qlNa On9OZMcKfZcQ8sRQPONYrhfLVszWXaiPxWcn+VO9pThAL6VNamikt51RGqLNt6x3 N68Pf3vUt6s3cHxnIogMDJkfNpjFHZ2uncQXsIsLDmYJn0C4AFyIvyxY68nfArAo yAPxgfJpBnQh5Oaz+DwhwOne43nZ6YBoJuEWX0MpvbU39epRWgVA5a46wmupLwOf 7DHoXrJD8hsldDOK89eDS5de/Umx+Uibcx8RnA7twRGPmxMWyshoQ2sqck5ndzqQ U7s0SwFwjNWZslfYiV4OYZOo+RAk7Wj5QF4RIcak7STi8nPdrwatisQ86qwhT8FU oS3w5p/lCRwLFuxpIQM5c1N4OuiKq78VmnUvH5PJmxaRvoAukdZf+3Xs+QN0M3wV tEkZYp0TGvV6C3nX1RL0 =SGyH -----END PGP SIGNATURE----- --KgjeSnopfo7BWjj8gmgep57S3EDAM8Xva--