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

From: Bill Fink <[email-masked]>
Date: Thu, 20 Sep 2012 12:21:56 -0400

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