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Date: Tue, 11 Oct 2016 12:30:19 -0600 From: Jason Gunthorpe <jgunthorpe@...idianresearch.com> To: Doug Ledford <dledford@...hat.com> Cc: Paolo Abeni <pabeni@...hat.com>, linux-rdma@...r.kernel.org, Sean Hefty <sean.hefty@...el.com>, Hal Rosenstock <hal.rosenstock@...il.com>, netdev@...r.kernel.org Subject: Re: [PATCH] IB/ipoib: move back the IB LL address into the hard header 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 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 setting > 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.. Jason
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