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From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH net] net: ipv6: ip6_output: alloc skb with tailroom
Date: Wed, 06 Jun 2018 14:11:25 -0400 (EDT)
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From: Alexander Aring <aring@mojatatu.com>
Date: Wed, 6 Jun 2018 14:09:20 -0400

> okay, then you want to have this patch for net-next? As an optimization?
> 
> Of course, when it's open again.

Like you, I have questions about where this adjustment is applied and
why.  So I'm not sure yet.

For example, only IPV6 really takes it into consideration and as you
saw only really for the fragmentation path and not the normal output
path.

This needs more consideration and investigation.