On Tue, 2016-10-11 at 11:42 -0600, Jason Gunthorpe wrote: > On Tue, Oct 11, 2016 at 07:37:32PM +0200, Paolo Abeni wrote: > > On Tue, 2016-10-11 at 11:32 -0600, Jason Gunthorpe wrote: > > > On Tue, Oct 11, 2016 at 07:15:44PM +0200, Paolo Abeni wrote: > > > > > > > Also the connected mode maximum mtu is reduced by 16 bytes to > > > > cope with the increased hard header len. > > > > > > Changing the MTU is going to cause annoying interop problems, can you > > > avoid this? > > > > I don't like changing the maximum MTU value, too, but I was unable to > > find an alternative solution. The PMTU detection should protect against > > such issues. > > It is more that PMTU, we have instructed all users that is the MTU > number needed to enable CM mode, so it appears in documentation, > scripts, etc.
AFAICS the max mtu is already underlying h/w dependent, how does such differences are currently coped by ? (I'm sorry I lack some/a lot of IB back-ground)
