- Latency problem due to small TCP/IP packetsize

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- Latency problem due to small TCP/IP packetsize

- Latency problem due to small TCP/IP packetsize

2007-07-12 - By mhohmann

Back
Hello,

we run a couple of webservices as interfaces to some datawarehouse reports. The
webservices take some parameters in the soap-request to run the sql-querys
against the DB. The result-data is returned as an XML-element in the body of
the soap-reponse.

An average reponse is about 130KB. With an MTU around 1500Byte the response
should fit in <100 packets, but a network sniff showed that the server
generates >10,000 packets for one response. The push-option in the IP-header is
also set which instructs the IP-stack to send the paket immediatly before its
payload-capacity is filled.

This leads to latency problems because the firewall between the server and the
client-applications takes more time to examine the packets. In case of a 130KB
response a webservice-request through the firewall takes 10 seconds compare to
<2 seconds without the firewall between client and server.

Are there any options to configure the packetsize or some buffer parameters to
change the behavior of packet generation (or Sockets) in JBoss, JBossWS or JVM?
I really don??t know where to search for a Solution.

I hope someone can help me.
I'm looking foreward for your replies. Thanks in advance.

Michael Hohmann

PS: Sorry for my bad english

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