linux-kernel - Re: [PATCH net-next RFC] net: increase LL_MAX

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Date:	Wed, 16 Sep 2015 10:59:36 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	David.Laight@...LAB.COM
Cc:	haiyangz@...rosoft.com, vkuznets@...hat.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	kys@...rosoft.com, jasowang@...hat.com
Subject: Re: [PATCH net-next RFC] net: increase LL_MAX_HEADER for Hyper-V

From: David Laight <David.Laight@...LAB.COM>
Date: Wed, 16 Sep 2015 16:25:03 +0000

> Am I right in thinking this is adding an extra 96 unused bytes to the front
> of almost all skb just so that hyper-v can make its link level header
> contiguous with whatever follows (IP header ?).
> 
> Doesn't sound ideal.

Agreed, this is rediculous, and the entire stack will incur this cost
just because hyperv is enabled in the kernel config.
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