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.
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