Re: [lvs-users] Client, Server and Director in same LAN

To: Michael Schwartzkopff <misch@xxxxxxxxxxxxxxxxx>
Subject: Re: [lvs-users] Client, Server and Director in same LAN
Cc: lvs-users@xxxxxxxxxxxxxxxxxxxxxx
From: Simon Horman <horms@xxxxxxxxxxxx>
Date: Sat, 30 Oct 2010 12:03:33 +0900
On Thu, Oct 28, 2010 at 03:59:17PM +0200, Michael Schwartzkopff wrote:
> On Thursday 28 October 2010 13:42:47 Simon Horman wrote:
> > On Thu, Oct 28, 2010 at 08:24:36AM +0200, Michael Schwartzkopff wrote:
> > > Hi,
> > > 
> > > is it possible to use direct routing with clients, real server and
> > > director in the same LAN?
> > 
> > Yes. Actually, that is how I do most of my testing.
> Do you have any idea why the director might limit the performance of our 
> system? Without LB I get 100 connections/s to the real IP address of a real 
> server. When I address the virtual IP of the director I get a performance 
> drop 
> to 1 connection/s.
> tcpdump shows that sometimes I have no traffic at all on the line to 0.2 sec.
> Any ideas? Thanks.

If you are running 2.6.36 then this may relate to a performance
regression related to the introduction of double NAT.

But regardless, that is a pretty startling result that
I don't have a decent explanation for.

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