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Unlike previous versions of Windows which had static receive window (RWIN) settings, XP Home Edition and XP Professional have dynamic settings.

Therefore, the default settings are based on maximum segment size (MSS) and Maximum Transmission Unit (MTU) setting, as well as responses from the Dynamic Host Configuration Protocol (DHCP) server and line speed. Windows uses even multiples of the MSS to calculate the RWIN, as described in the Microsoft Knowledge Base:

"The receive window specifies the number of bytes a sender can transmit without receiving an acknowledgment. In general, larger receive windows will improve performance over high (delay * bandwidth) networks. For highest efficiency, the receive window should be an even multiple of the TCP Maximum Segment Size (MSS)."

Feedback received on this FAQ entry:
  • XP doesn't have dynamic settings!

    2012-01-28 02:10:18

  • This information implies that you shouldn't change RWIN due to the fact that it is optimized dynamicly

    2009-11-16 15:19:18

  • Arre the dynamic settings like in vista? if it is dynamic like in vista then should we still tweak it?

    2008-09-15 23:36:54



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by jazzman916 See Profile edited by JMGullett See Profile
last modified: 2007-02-21 16:32:46