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From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH RFC net-next 00/11] udp gso
Date: Wed, 18 Apr 2018 13:40:48 -0400 (EDT)
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From: Willem de Bruijn <willemdebruijn.kernel@gmail.com>
Date: Wed, 18 Apr 2018 09:51:50 -0400

> Eric is correct. If the application sets a segment size with UDP_SEGMENT
> this is an instruction to the kernel to split the payload along that border into
> separate discrete datagrams.
> 
> It does not matter what the behavior is without setting this option. If a
> process wants to send a larger than MTU datagram and rely on the
> kernel to fragment, then it should not set the option.

+1