Apache Reference: http_core, SendBufferSize
TCP/IP Send Buffer Size
Syntax: SendBufferSize A
Example: SendBufferSize 131072
Since: Apache 1.2
This directive forces the server to set the TCP/IP send buffer
size to the number of bytes specified. It allows you to
increase the standard operating system defaults on high-speed,
high-latency network links. The default value for bytes depends
on the particular operating system.