Thank you for the post. It depends on the system and setup, what you can try is to tweak the following options:
adjust the Interrupt Moderation, TCP/IP offloading options, Performance option Transmit and Receive buffer
You may refer to this website for more details about each setting
http://www.intel.com/support/network/sb/cs-025841.htm Network Connectivity — Advanced Settings for Intel® Ethernet 10/100 and Gigabit Adapters
Hope this helps.