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Just to follow up on this, the packet loss appeared to be an unrelated
issue. If I connect directly to a realserver, the page loads fairly fast.
If I connect through the loadbalancer ( and get the same real server) I see
a lot of tcp retranmissions and such (as sniffed from the real server). I
can't figure it out. The delays appear to be from the RTO (retrans
timeout). I saw a patch from miccy soft about the mtu discovery and have
installed, I also tried disabling mtu discovery.
Is lvs-nat "more compatible"?
On 8/2/07, Dan Baughman <dan.baughman@xxxxxxxxx> wrote:
>
> Well we are getting 1 - 5% packet loss to one of the real servers. We may
> have a layer 2 issue here, or perhaps something physical I'll let you know
> what we turn up. Thanks for your time and suggestions.
>
>
> On 8/1/07, Joseph Mack NA3T <jmack@xxxxxxxx> wrote:
> >
> > On Wed, 1 Aug 2007, Dan Baughman wrote:
> >
> > > Thanks for the suggestions so far, here is what the dumps yielded.
> > >
> > > I'm using ethereal to look at a side-by-side comparison of
> > > a healthy conversation and one of the delayed
> > > conversations. The delayed conversation has two tcp
> > > packet types that the normal conversation doesn't:
> > >
> > > 1) A lot of duplicate acks from the client to the server
> >
> > do both get to the realserver?
> >
> > > 2) TCP Retransmissions from the server to client.
> >
> > do both transmissions arrive at the client? (I assume they
> > leave the realserver.)
> >
> > > It seems that there is a lot of traffic being duplicated
> > > and received by the real server twice. This isn't
> > > occuring when they access the realserver ip to view the
> > > site. The extra load time is occuring after the server
> > > receives such a duplicate ack, its a pause of about 3
> > > seconds, then a tcp retransmission occurs.
> >
> > hmm. Nothing springs to mind.
> >
> > do you have any iptables rules anywhere?
> >
> > is the unhealthy connection from clients all at one
> > site/coming in from one provider?
> >
> > > I guess it might be a version issue, 'ivsadm -v' yields:
> > > ipvsadm v1.24 2003/06/07 (compiled with popt and IPVS
> > > v1.2.0)
> >
> > do you have a matching ipvsadm/ip_vs pair?
> >
> > Joe
> >
> > --
> > Joseph Mack NA3T EME(B,D), FM05lw North Carolina
> > jmack (at) wm7d (dot) net - azimuthal equidistant map
> > generator at http://www.wm7d.net/azproj.shtml
> > Homepage http://www.austintek.com/ It's GNU/Linux!
> >
> > _______________________________________________
> > LinuxVirtualServer.org mailing list - lvs-users@xxxxxxxxxxxxxxxxxxxxxx
> > Send requests to lvs-users-request@xxxxxxxxxxxxxxxxxxxxxx
> > or go to http://lists.graemef.net/mailman/listinfo/lvs-users
> >
>
>
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