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List:       activemq-dev
Subject:    [jira] Created: (AMQ-1143) Need a way to set tcpNoDelay on peer
From:       "Andrew Steele (JIRA)" <jira () apache ! org>
Date:       2007-01-29 20:37:03
Message-ID: 26682065.1170103023432.JavaMail.jira () brutus
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Need a way to set tcpNoDelay on peer transport TCP network connections
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                 Key: AMQ-1143
                 URL: https://issues.apache.org/activemq/browse/AMQ-1143
             Project: ActiveMQ
          Issue Type: Improvement
          Components: Transport
    Affects Versions: 4.1.0
         Environment: Windows XP Professional / JRE 1.5.0_11
            Reporter: Andrew Steele


I really like the peer transport in ActiveMQ.  It seems to be just the kind of setup \
we need.  However, we do have low round-trip latency requirements in some \
applications.  I was seeing unacceptably bad latencies (~200ms) for synchronous round \
trips.  I installed Wireshark and performed network analysis to see what was going \
on.  It appeared to be a Nagle algorithm / TCP ACK delay issue.  Essentially, after \
the first message request and reply, the next request message may be delayed while \
waiting for a delayed ACK from the other broker.  This should be resolvable by \
enabling tcpNoDelay.  However, the peer transport URI provides no mechanism to enable \
tcpNoDelay.  In fact, I went into the source code and found that the TCP network \
connecter specified in the PeerTransportFactory is hard coded to tcp://localhost:0.  \
Basically, I need a way to turn on tcpNoDelay in peer transport.

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