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

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Message-Id: <20150917.115218.655587837796826886.davem@davemloft.net>
Date:	Thu, 17 Sep 2015 11:52:18 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	kys@...rosoft.com
Cc:	David.Laight@...LAB.COM, alexander.duyck@...il.com,
	haiyangz@...rosoft.com, vkuznets@...hat.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	jasowang@...hat.com
Subject: Re: [PATCH net-next RFC] net: increase LL_MAX_HEADER for Hyper-V

From: KY Srinivasan <kys@...rosoft.com>
Date: Thu, 17 Sep 2015 15:14:05 +0000

> I think I can achieve my original goal of not having any allocation
> in the send path by carefully using the memory available in the skb:

Please stop flat-out ignoring David L.'s suggestion.

Have a pre-cooked ring of buffers for these descriptors that you can
point the chip at.  No per-packet allocation is necessary at all.

If you play games with SKBs you will get burned.
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