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https://issues.apache.org/jira/browse/DIRMINA-561?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Julien Vermillard closed DIRMINA-561.
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> Socket.setReceiveBufferSize() called after bind preventing correct TCP
> receive window scaling
> ---------------------------------------------------------------------------------------------
>
> Key: DIRMINA-561
> URL: https://issues.apache.org/jira/browse/DIRMINA-561
> Project: MINA
> Issue Type: Bug
> Components: Transport
> Affects Versions: 1.0.0, 1.0.1, 1.0.2, 1.0.3, 1.1.0, 1.0.4, 1.1.1, 1.0.5,
> 1.1.2, 1.0.6, 1.1.3, 1.0.7, 1.1.4, 1.0.8, 1.1.5, 1.0.9, 1.1.6, 2.0.0-M1
> Environment: Head of the 1.1 branch
> Reporter: Greg Dhuse
> Assignee: Trustin Lee
> Fix For: 1.0.10, 1.1.7, 2.0.0-M2
>
> Original Estimate: 0h
> Remaining Estimate: 0h
>
> Socket.setReceiveBufferSize() must be called before bind() on a ServerSocket
> in order to allow TCP receive window scaling up to the configured buffer size
> (http://java.sun.com/j2se/1.5.0/docs/api/java/net/Socket.html#setReceiveBufferSize(int)).
> Currently, socket options are set after bind() is called. This results in
> the correct Java receive buffer size, but does not allow the TCP stack to
> scale receive windows above 64k. Severe performance degradation can occur on
> high-latency high-bandwidth connections.
> The following patch is a possible solution to this issue, though there may be
> a cleaner way to implement a fix within the framework.
> Best regards,
> Greg
> Index:
> core/src/main/java/org/apache/mina/transport/socket/nio/SocketConnector.java
> ===================================================================
> ---
> core/src/main/java/org/apache/mina/transport/socket/nio/SocketConnector.java
> (revision 642333)
> +++
> core/src/main/java/org/apache/mina/transport/socket/nio/SocketConnector.java
> (working copy)
> @@ -163,6 +163,16 @@
> try {
> ch = SocketChannel.open();
> ch.socket().setReuseAddress(true);
> +
> + // Receive buffer size must be set BEFORE the socket is
> connected
> + // in order for the TCP window to be sized accordingly
> + if (config instanceof SocketConnectorConfig) {
> + SocketSessionConfig sessionConfig =
> + ((SocketConnectorConfig) config).getSessionConfig();
> + ch.socket().setReceiveBufferSize(
> + sessionConfig.getReceiveBufferSize());
> + }
> +
> if (localAddress != null) {
> ch.socket().bind(localAddress);
> }
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