Thanks Brian. Will do
> Date: Wed, 14 May 2008 09:53:18 -0500
> From: brian.stansberry@redhat.com
> To: wagad@hotmail.com
> CC: jboss-cluster-dev@lists.jboss.org
> Subject: Re: [jboss-cluster-dev] TCP vs. UDP
>
> Please post on the JBoss Clustering User Forum at
> http://www.jboss.com/index.html?module=bb&op=viewforum&f=64 . This
> mailing list is for discussions related to the development of clustering
> features in JBoss projects, not for usage questions.
>
> M Wagad wrote:
> > We have 2 node JBOSS Cluster, and we are having performance issue, what
> > we found out is that if we turn of the slave server, and operate the one
> > master node (Changing the load balance to 100/0), we have much better
> > performance then when we have both of the running sharing the load with
> > 50/50 load balance.
> >
> > Would changing the default Protocol of UDP to TCP make any difference in
> > terms of Performance?
> >
> > I had come across these posts on the Net that praises TCP over UDP for
> > organizations that have less then 16 JBOSS Nodes :-
> >
> >
> >
> >
> > For TCP…
> >
> >
> >
> > /“We experiment with another configuration using TCP/IP and show that
> > current J2EE application server clusters up to 16 nodes (the largest
> > configuration we tested) can scale much better with this configuration. /
> >
> > /We attribute the superiority of TCP/IP based group communications over
> > UDP/IP multicast to a better flow control management and a better usage
> > of the network switches available in cluster environments.”/
> >
> >
> >
> > And UDP..
> >
> >
> >
> > “Having to support reliable multicast UDP communication is not a piece
> > of cake. Drop a couple of packets and you get only a fraction of the
> > throughput. Then lose the ordering of the packets and you are in a
> > slump. The situation can turn pretty sour if you use large messages that
> > get fragmented (more than one UDP packet). You only need to lose one
> > packet to lose your entire message - then you resend everything. The
> > point is that in unideal and congested conditions you start to miss TCP,
> > and it is probably extremely hard to beat its adaptive protocol that has
> > been perfected for so many years.”
> >
> >
> >
> >
> >
> > I would also like to know if any companies out there make the change
> > from UDP to TCP and if they can share their experience with us.
> >
> >
> >
> > Thanks
> > M. Wagad.
> >
> >
> > ------------------------------------------------------------------------
> >
> >
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>
> --
> Brian Stansberry
> Lead, AS Clustering
> JBoss, a division of Red Hat
> brian.stansberry@redhat.com