From mboxrd@z Thu Jan  1 00:00:00 1970
From: Eric Dumazet <eric.dumazet@gmail.com>
Subject: Re: [PATCH v3] net-tcp: TCP/IP stack bypass for loopback
 connections
Date: Thu, 20 Sep 2012 13:51:11 +0200
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On Thu, 2012-09-20 at 07:28 -0400, Stephen Clark wrote:
>  
> Does this mean traffic on the loopback interface will not traverse 
> netfilter?
> 

Yes this was already mentioned.

Only the SYN / SYNACK messages will

All data will bypass IP stack, qdisc (if any), loopback driver, and
netfilter.