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: Tue, 11 Oct 2016 14:50:11 -0400 Message-ID: <9bed7085-949b-c68b-91ed-f930702a6a94@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> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="XRitH7f1gUPqXUnvAXoX2rXC8EHOspUQc" Cc: Paolo Abeni , linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Sean Hefty , Hal Rosenstock , netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Jason Gunthorpe Return-path: In-Reply-To: <20161011183019.GC20253-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org> Sender: linux-rdma-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: netdev.vger.kernel.org This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --XRitH7f1gUPqXUnvAXoX2rXC8EHOspUQc Content-Type: multipart/mixed; boundary="VeSQS6lJNj3Cphhis3xh1Hkex1NVlmXid"; protected-headers="v1" From: Doug Ledford To: Jason Gunthorpe Cc: Paolo Abeni , linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Sean Hefty , Hal Rosenstock , netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org Message-ID: <9bed7085-949b-c68b-91ed-f930702a6a94-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> Subject: Re: [PATCH] IB/ipoib: move back the IB LL address into the hard header References: <1dbd83dfe7f435eecc5bc460e901b47758280f30.1476206016.git.pabeni-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> <20161011173216.GA16892-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org> <22f61258-9bcf-0adc-f23f-79a4f1d50c6a-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> <20161011180119.GB17319-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org> <1476209407.448.9.camel-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> <073e0007-a43b-134d-ba7e-b290304be585-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> <20161011183019.GC20253-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org> In-Reply-To: <20161011183019.GC20253-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org> --VeSQS6lJNj3Cphhis3xh1Hkex1NVlmXid Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable On 10/11/2016 2:30 PM, Jason Gunthorpe wrote: > On Tue, Oct 11, 2016 at 02:17:51PM -0400, Doug Ledford wrote: >=20 >> 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 anyone= >> 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 settin= g >> 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. >=20 > So it is just docs and relying on PMTU? That is not as bad.. >=20 > Still would be nice to avoid if at all possible.. 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, and see what happens. --=20 Doug Ledford GPG Key ID: 0E572FDD --VeSQS6lJNj3Cphhis3xh1Hkex1NVlmXid-- --XRitH7f1gUPqXUnvAXoX2rXC8EHOspUQc 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/TRjAAoJELgmozMOVy/dWZkP/RQGuS33dAd9MDKr61HfF4Ss t6TBu74GyIzhuIZ+FfbSdeRbQzzeoKkQBW/rTfIUPzsZolo/doQfNTX+uqZdNgqm 53RcSK8g59ScUgRHcgWDHeAapM2Xzq4y/JHgekAHaBa6EpUYxZnUcrU9cQSmM58F D1g+dj+iGlunsO3vyqHAnA6850fz2a5vTxiYy4r1IXVE2qkwDTmkNpwUgzGBMmRx W95BGnOWc4YeUsDUlTbTBM/GockR7xZSp5A1TACFKjmnbts6JvTPV25rQxE/K1aN 4DGc7HtbPoLMgOL6qLDpJzjKINEeqRvcAvXEg7D2Ewy+PEWH1KEBuxF97odtmdin M9meTmtH1uKsbJgwwqMj4MJ1UqghtqgIUN1nK/2zijBan5SWb291xdv37xx32JDS SQKyjuncES6PewfiTu1gMQg3UMY32hjKbeKxX+Oh3ItRf72zHyLrTejb4Ui2uCU/ Cr9MWuXV6nJjTVxyBBgnJaKaAX0k/3ifrl6cnioHEfKxVklyHePWpAbQi0fAwBPZ ytory4D/Kbtclri4u6zoGsGf9/+qmlibY2jj1mxw+TOtYNQf/RVwq2rQYKEGwqb1 hMmI93Z/ZJb9MnT3YaZxUdUP1A4n3WbsHXJw6Tz/LDScZkJBJqEovYJROcq0j3zx 4zjr1FeCnDNp+GKRBTaq =XVsW -----END PGP SIGNATURE----- --XRitH7f1gUPqXUnvAXoX2rXC8EHOspUQc-- -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html