JGroups Transfer Rate with UDP really slow

redchili Jun 11, 2007 10:27 AM

Hello,

I've configured a two node JBoss 4.2.0GA cluster with farming deployment. I'm experiencing really low transfer performance of states and farm-deployed applications when using JGroups over UDP. Switching to TCP does the job immediately.
The difference is immense 15minutes with UDP and a few seconds with TCP.
Both machines are on the same network, no firewalls, routers whatsoever in between.

Any ideas why this is happening?

Reinhard

1. Re: JGroups Transfer Rate with UDP really slow

seniorfrog Jun 28, 2007 12:00 PM (in response to redchili)

Check out the performance test results on the JGroups website.

http://www.jgroups.org/javagroupsnew/docs/Perftest.html

I imagine it has something to do with flow control (UDP doesn't provide very good flow control, and therefore packets get lost).
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2. Re: JGroups Transfer Rate with UDP really slow

redchili Jul 26, 2007 8:06 AM (in response to redchili)

But that flow control has such a big impact on that?
I mean the nodes are all attached to the same switch, I don't think that any packets get received out of order and are discarded.
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