How to reach Large TCP window in Win (2000) or Linux

From: Dusan Statelov ([email protected])
Date: Mon May 28 2001 - 11:00:26 EDT

  • Next message: Jon Mansey: "Re: How to reach Large TCP window in Win (2000) or Linux"

    Hello:

    As we are now in time pressure I would like ask you for advices how to
    properly configure Win2000 or Linux Http data server in order to achieve
    bigger TCP window and improve Single TCP connection from poor 20-30
    kbyte/s (for RTT 240 ms) to according to us achievable 1 mbps.
    We have changed "Default Receive Window", but TCP is running at only
    20-30 kbyte/s what would corresponde to 8 kbyte Window rather then to 64
    kbyte.
    I assume there are other TCP registry entities which influence Sender
    Window.

    Here is a configuration emulating satellite internet:

    Http Data Server [Linux or Win2000] -> DVB/ip -> DVB-S Modulator -> L
    band output -> PC DVB board [SkyMedia - Telemann, TT DVB Technotrend] ->

    client PC [Win98] o---------------o connected to DVB/ip GW in return
    via LAN
    LAN RTT 20 ms
    Artefficial delay in DVB/ip GW 220 ms (in order to simulate long RTT for
    satellite)

    Windows98
    Default Receive Window to max.values 65535
    Data Sever Win2000
    Default Receive Window to max.values 65535 (we tried even 0,5 Mbyte with
    no effect)
    RTT 240 ms
    Single TCP connection 20 - 30 kbyte/s

    Thanks in advance.

    Dusan Statelov
    Managing Director
    Main Data,s.r.o.
    mailto:[email protected]

    Tel: +421 7 54789 586
    Fax: +421 7 54789 585
    GSM: +421 905 606 027
    http://www.maindata.sk


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