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RE: Performance issues with LVS-NAT

To: "LinuxVirtualServer.org users mailing list." <lvs-users@xxxxxxxxxxxxxxxxxxxxxx>
Subject: RE: Performance issues with LVS-NAT
From: "Peter Mueller" <pmueller@xxxxxxxxxxxx>
Date: Tue, 8 Feb 2005 16:08:02 -0800
> On Feb 8, 2005, at 5:17 PM, Peter Mueller wrote:
> 
> The thread you referenced for issue #1 looks to be specific 
> for DR.  Am 
> I mistaken?

Yes, I meant to say
http://marc.theaimsgroup.com/?l=linux-virtual-server&m=99308024901013&w=2.  I
believe the HOWTO section for this is
http://www.austintek.com/LVS/LVS-HOWTO/HOWTO/LVS-HOWTO.LVS-NAT.html#one_netwo
rk, but I didn't spend enough time to verify.  It will be your job to make
sure I didn't send the wrong link again ;_).  If it is the wrong link you can
look at Joseph Mack's configure script for the morsel of goodness.

> Yes, http (wget on a 15MB file).  I haven't yet run testlvs, 
> when I do 
> I'll post results.  Later tonight.
> 
> I tested again using wget etc with just one real server, and was able 
> to get about 20mbit/s for the single connection.  As I threw more 
> parallel connections at it they all slowed until the 
> aggregate traffic 
> was in the 20-30mbit/s range.  When going through the css to a single 
> server I'm able to more than double that for single or parallel 
> connections.

Something is different.  What does tcpdump say when the traffic starts
slowing?  Are there repeat requests or packetloss?  Is there anything in
(e.g.) ifconfig that indicates bad network setup?  Maybe your NICs somewhere
are in auto and the switch is full duplex?  I don't think this is an LVS
problem.

Regards,

P

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