netdev - Re: [PATCH v3] net-tcp: TCP/IP stack bypass for loopback connections

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Message-Id: <20120920122156.44cbfd59.billfink@mindspring.com>
Date:	Thu, 20 Sep 2012 12:21:56 -0400
From:	Bill Fink <billfink@...dspring.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	sclark46@...thlink.net, Bruce Curtis <brutus@...gle.com>,
	David Miller <davem@...emloft.net>, edumazet@...gle.com,
	netdev@...r.kernel.org
Subject: Re: [PATCH v3] net-tcp: TCP/IP stack bypass for loopback
 connections

On Thu, 20 Sep 2012, Eric Dumazet wrote:

> 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.

These restrictions and any others should be documented in ip-sysctl.txt.

>From Eric's earlier e-mail:

-> no iptables, 
   no qdisc (by default there is no qdisc on lo),
   no loopback stats (ifconfig lo).
   some SNMP stats missing as well (netstat -s)

						-Bill
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