Re: [lvs-users] Some users slow loading..

To: " users mailing list." <lvs-users@xxxxxxxxxxxxxxxxxxxxxx>
Subject: Re: [lvs-users] Some users slow loading..
From: Joseph Mack NA3T <jmack@xxxxxxxx>
Date: Fri, 14 Sep 2007 12:42:14 -0700 (PDT)
On Fri, 14 Sep 2007, Joerg Delker wrote:

> Hi Folks,
> I just found this thread in the archives describing my problem.
> So let me tune in so we hopefully can find that bummer.
> Symptoms:
> I'm also suffering from very slow connections via the VIPs in contrast to 
> accessing the real servers directly. A wget fetch from a particular web takes 
> ~40sec via the VIP and ~4sec directly.
> Analysis:
> Looking at the related tcpdumps for the VIP traffic I see:
> in dump (Client<->Director):
> * TCP Retransmissions VIP->Client
> * Duplicate ACKs Client->VIP
> in dump (Director<->Realserver)
> * TCP Retransmissions Realserver->Client
> * Duplicate ACKs Client->Realserver
> * TCP previous segment lost Client->Realserver (appears after each Dup ACK)
> Note: Routing client traffic directly to the real server shows perfect TCP 
> traffic!
> Environment:
> The director is acting as firewall, router, loadbalancer using
> ipvsadm v1.24 2003/06/07 (compiled with popt and IPVS v1.2.0)
> and configured as LVS-NAT to access the real servers.
> Kernel tested: 2.6.16, 2.6.18, 2.6.22 - no difference noticable
> Hardware issues can be ruled out as the directly routed traffic uses exact 
> the same path.

there's a section on slow loading webpages in (I think) the 

Also try your setup without the firewall rules

Joseph Mack NA3T EME(B,D), FM05lw North Carolina
jmack (at) wm7d (dot) net - azimuthal equidistant map
generator at
Homepage It's GNU/Linux!

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