On September 26, 2011 4:25 , Dusan Geratovic <[email protected]>
wrote:
Which version of TCP protocol does the Apache Server 2.2 use? I have
noticed that in case of packet loss TCP window does not shrink to the
half size (like standard version does), but to the 20, 30% of its
original size. I suppose that the some modified version is used (High
Speed TCP or something like that).
Apache HTTP Server uses the version of TCP provided by the operating
system it is running on. The Apache Portable Runtime (APR) library is
used to provide a consistent interface to Apache HTTP Server regardless
of operating-system-specific variations. See
https://apr.apache.org/docs/apr/1.4/group__apr__network__io.html and
https://apr.apache.org/docs/apr/1.4/group__apr__sockopt.html
I'm not aware of anything in Apache HTTP Server or APR that controls TCP
windowing, although they do use the TCP_NODELAY, TCP_CORK, and
TCP_NOPUSH socket options: see
http://www.techrepublic.com/article/tcpip-options-for-high-performance-data-transmission/1050878
From my limited knowledge, I suspect the windowing behavior you are
seeing is due to behavior of your operating system kernel.
--
Mark Montague
[email protected]
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