TCP Fusion is a feature for providing TCP loopback and is implemented in the
Transmission Control Protocol
The Transmission Control Protocol (TCP) is one of the main communications protocol, protocols of the Internet protocol suite. It originated in the initial network implementation in which it complemented the Internet Protocol (IP). Therefore, th ...
(TCP) stack within
Oracle
An oracle is a person or thing considered to provide insight, wise counsel or prophetic predictions, most notably including precognition of the future, inspired by deities. If done through occultic means, it is a form of divination.
Descript ...
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Solaris
Solaris is the Latin word for sun.
It may refer to:
Arts and entertainment Literature, television and film
* ''Solaris'' (novel), a 1961 science fiction novel by Stanisław Lem
** ''Solaris'' (1968 film), directed by Boris Nirenburg
** ''Sol ...
-10 and Solaris-11 operating systems as well as a number of software projects based on the open source codebase from the
OpenSolaris
OpenSolaris () is a discontinued open-source computer operating system for SPARC and x86 based systems, created by Sun Microsystems and based on Solaris. Its development began in the mid 2000s and ended in 2010.
OpenSolaris was developed as ...
project. The idea is trivial in that a client and server connection on a local loopback interface within the same system should not need the entire TCP/IP protocol stack to exchange data. Therefore, provide a faster data path with the fusion of the two end points.
The source code is well documented in inet/tcp/tcp_fusion.c which clearly states:
The feature may be enabled or disabled via the /etc/system config file for the Solaris or genunix kernel and the only line required is "set ip:do_tcp_fusion = 0x0" which set the feature off or FALSE while of "0x1" for hexadecimal TRUE.
See https://github.com/illumos/illumos-gate/blob/master/usr/src/uts/common/inet/tcp/
Fusion
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