From mboxrd@z Thu Jan 1 00:00:00 1970 From: Doug Ledford Subject: Re: [PATCH] IB/ipoib: move back the IB LL address into the hard header Date: Wed, 12 Oct 2016 14:21:46 -0400 Message-ID: <4779d199-4515-ee06-af0f-69e1d1b86b86@redhat.com> References: <1dbd83dfe7f435eecc5bc460e901b47758280f30.1476206016.git.pabeni@redhat.com> <20161011173216.GA16892@obsidianresearch.com> <22f61258-9bcf-0adc-f23f-79a4f1d50c6a@redhat.com> <20161011180119.GB17319@obsidianresearch.com> <1476209407.448.9.camel@redhat.com> <073e0007-a43b-134d-ba7e-b290304be585@redhat.com> <20161011183019.GC20253@obsidianresearch.com> <9bed7085-949b-c68b-91ed-f930702a6a94@redhat.com> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="IAmVhdT75FG2B94rwtsEAu9BUF5L6OI6G" Cc: Paolo Abeni , linux-rdma@vger.kernel.org, Sean Hefty , Hal Rosenstock , netdev@vger.kernel.org To: Jason Gunthorpe Return-path: Received: from mx1.redhat.com ([209.132.183.28]:42684 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932868AbcJLSWC (ORCPT ); Wed, 12 Oct 2016 14:22:02 -0400 In-Reply-To: <9bed7085-949b-c68b-91ed-f930702a6a94@redhat.com> Sender: netdev-owner@vger.kernel.org List-ID: This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --IAmVhdT75FG2B94rwtsEAu9BUF5L6OI6G Content-Type: multipart/mixed; boundary="ohePGETKNmv91mOwiBIJ5lxsD9ltNDiwJ"; protected-headers="v1" From: Doug Ledford To: Jason Gunthorpe Cc: Paolo Abeni , linux-rdma@vger.kernel.org, Sean Hefty , Hal Rosenstock , netdev@vger.kernel.org Message-ID: <4779d199-4515-ee06-af0f-69e1d1b86b86@redhat.com> Subject: Re: [PATCH] IB/ipoib: move back the IB LL address into the hard header References: <1dbd83dfe7f435eecc5bc460e901b47758280f30.1476206016.git.pabeni@redhat.com> <20161011173216.GA16892@obsidianresearch.com> <22f61258-9bcf-0adc-f23f-79a4f1d50c6a@redhat.com> <20161011180119.GB17319@obsidianresearch.com> <1476209407.448.9.camel@redhat.com> <073e0007-a43b-134d-ba7e-b290304be585@redhat.com> <20161011183019.GC20253@obsidianresearch.com> <9bed7085-949b-c68b-91ed-f930702a6a94@redhat.com> In-Reply-To: <9bed7085-949b-c68b-91ed-f930702a6a94@redhat.com> --ohePGETKNmv91mOwiBIJ5lxsD9ltNDiwJ Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable On 10/11/2016 2:50 PM, Doug Ledford wrote: > On 10/11/2016 2:30 PM, Jason Gunthorpe wrote: >> On Tue, Oct 11, 2016 at 02:17:51PM -0400, Doug Ledford wrote: >> >>> Well, not exactly. Even if we put 65520 into the scripts, the kernel= >>> will silently drop it down to 65504. It actually won't require anyon= e >>> change anything, they just won't get the full value. I experimented >>> with this in the past for other reasons and an overly large MTU setti= ng >>> just resulted in the max MTU. I don't know if that's changed, but if= it >>> still works that way, this is much less of an issue than it might >>> otherwise be. >> >> So it is just docs and relying on PMTU? That is not as bad.. >> >> Still would be nice to avoid if at all possible.. >=20 > I agree, but we have a test getting ready to commence. We'll know > shortly how much the reduced MTU effects things because they aren't > going to alter any of their setup, just put the new kernel in place, an= d > see what happens. >=20 >=20 Long story short on the MTU stuff, the setups whined a bit about not being able to set the desired MTU, used the new max MTU instead, and things otherwise worked fine. But, Paolo submitted a v2 patch that removes this change, so it's all moot anyway. --=20 Doug Ledford GPG Key ID: 0E572FDD --ohePGETKNmv91mOwiBIJ5lxsD9ltNDiwJ-- --IAmVhdT75FG2B94rwtsEAu9BUF5L6OI6G 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 Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iQIcBAEBCAAGBQJX/n86AAoJELgmozMOVy/dHbkQAKsGv79P83AHzQZNVYqsErOy lMVPVe0CKnfgxmko1UioWhxNVWdp0tPuWQhD40nP3PWegZ786gGuNXEUQxQeZ69W 3P0EkD+JNQfmBA+rugyogPQCsHwjZ2AFeoMaQNMF+oswEPdUy5xp3EKZM2ztQNO6 B/wedPSDq3cmCW0NH5N0AItczUftljgDIMBziRhddoPUX+3Wu3cAE9W7bFwQFnvg NA1uHWG7j8VPhualbXEAkZVGbimq58F8ZA2SAoIc+xwe8KiQufl6zdl3GeD9Bt9o AfmqUZ+hFGSEG1NiL4iuRPVTGyEAFZo1vFsqC9H385farnxYL/YHqCwzcsChxeNw x/FtPw1dPbFwb+uKzh03MZmTlJopriWHojBXernIvUnEabeXRD2qGWzrFWIr5JIa p+p2zlRA35lgXQyGQPSKtQWSMjvfNesVG0Ly97IVzSe82nTwzNoINfK/XDWGey+a VztDw3Jn7Ju1/Nx/3YTmktjVLhXCpwg+8FdRakMuMqqRnzoNmdNVugL5VugU7V4K YmBhGU9c7vxbG5mMT1Yd17tvZ5qWDpViuwtli28MCYFlCD5Dh0HJwh7VdCpFU6Iy nHkAG/1nta5AjXN5z/ouJs5kMF5vQlLpU5rqWD77s+Y9TChsMraL1yTpEqFKtYcN /+/lYrHtf7HDROYzcu1h =pZLb -----END PGP SIGNATURE----- --IAmVhdT75FG2B94rwtsEAu9BUF5L6OI6G--