Hi All, Just to let people know, there are now new versions of the iptables tutorial, and the ipsysctl tutorial available. The iptables-tutorial was released the 24th in. store these parameters for use at boot time. For a deeper reference into the matter and use of sysctl see the IP Sysctl tutorial, maintained by Oskar Andreasson. For more information on TCP variables see: tutorial/#TCPVARIABLES. Starting in Linux (and.

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Tune your operating system according to your operating system documentation. These parameters determine the availability of user ports requested by an application. To optimize availability, the number of file descriptors for WebLogic Server should be appropriate for the host machine. This setting should be in balance with the complete message timeout parameter configured for the network channel.

The congestion control algorithm used is set using the sysctl variable net.

Another thing you can try that may help increase TCP throughput is to increase the size of the interface queue. Linux Tuning Parameters This section lists important Linux tuning parameters that when adjusted, can enhance application performance: Each socket connection to the server consumes a file descriptor. This problem was isysctl in version 2.


Windows Tuning Parameters For Windows platforms, the default settings are usually sufficient. A workaround for this problem is to use ethtool to disable segmentation offload:. By default, ephemeral that is, short-lived ports are allocated between the values of and inclusive using the MaxUserPort parameter.


You can use setsockopt in your program to set your buffers to any size up to GlobalMaxTcpWindowSize, or you can use TcpWindowSize to set the default send and receive buffers for ALL sockets to this size. The following sections describe issues related to operating system performance:. Although the following tutorizl provide information on tuning parameters that Oracle has determined can enhance application performance, Oracle recommends following your OS vendor’s tuning documentation for tuning tutorual values and monitoring performance changes when changing tuning parameters in your local environment.

Also, refer to your operating system documentation.

FreeBSD version before 4. Also, the “Ipsysctl Tutorial 1.

The current set of congestion control options are:. More information on various tuning parameters for Linux 2.

Ipsysctl < Wikilearn < TWiki

The default setting may be low, particularly for production systems. Starting with Linux 2. In some operating systems, this value is as low as MB. These lists are not all inclusive and parameters may be different, have different defaults, or be out of date for different Solaris operating systems.

Restricting the TCP buffer size to about 12 MB seems to avoid this problem, but clearly limits your total throughput. Like all operating systems, the default tutoial Linux TCP buffer sizes are way too small. A BIC implementation bug was discovered, but this was fixed in Linux 2. I’ve seen increases in bandwidth of up to 8x by doing this on some long, fast paths. Another solution is to disable SACK.

/proc/sys/net/ipv4 parameters (see sysctl) (LONG, can be ignored)

This section lists important TCP tuning parameters that when tuned, can enhance application performance:. More information on each of these algorithms and some results can be found here. This means that if a connection has has a retransmition and reduces its window, then all connections to that host for the next 10 minutes will use a reduced window size, and not even try to increase its window.


The TcpTimedWaitDelay parameter, which controls the amount of time the OS waits to reclaim a port after an application closes a TCP connection, has a default value of 4 minutes. And finally a warning for both 2. This section lists important CE Gigabit Network Card tuning parameters that when tuned, can enhance application performance:. Use the netstat -s -P tcp command to view all available TCP parameters.

/proc/sys/net/ipv4 parameters (see sysctl) (LONG, can be ignored)

Solaris Tuning Parameters The following sections provide information on tuning Solaris operating systems: Operating system error conditions always degrade performance. I suggest changing them to the following settings:. However, the Solaris and Linux platforms usually need to be tuned appropriately. For more information about Windows tuning options, see: More information on tuning parameters and defaults for Linux 2.

For more information, see Additional Solaris Tuning Information. To set this, do the following:. The only way to disable this behavior is to do the following before all new connections you must be root:. Common errors are ” connection refused “, ” too many open files ” on the server-side, and ” address in use: