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Thread: GlobalMaxTcpPWindowSize - TcpWindowSize

  1. #1
    Regular Member iflog's Avatar
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    Sep 2003
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    GlobalMaxTcpPWindowSize - TcpWindowSize

    Am I dreaming or does this really happen? It seems that when I lower the values of the two settings my pages load faster but my download speed decreases. If I increase the values my pages load slower but my download speed increases. Im trying to find the perfect setting.

    SpeedGuide.net TCP Analyzer Results
    Tested on: 10.21.2007 09:51
    IP address: 76.180.xx.xx

    TCP options string: 020405b40103030101010402
    MSS: 1460
    MTU: 1500
    TCP Window: 125560 (multiple of MSS)
    RWIN Scaling: 1
    Unscaled RWIN : 62780
    Reccomended RWINs: 64240, 128480, 256960, 513920
    BDP limit (200ms): 5022kbps (628KBytes/s)
    BDP limit (500ms): 2009kbps (251KBytes/s)
    MTU Discovery: ON
    TTL: 42
    Timestamps: OFF
    SACKs: ON
    IP ToS: 00000000 (0)

    btw. I have a fairly low ping usually around 60ms when tested at speedtest.net


    Here are my cablenut settings.

    http://i31.photobucket.com/albums/c384/iflog/cn.jpg
    Time Warner Cable - Road Runner
    10000/1000
    Windows 7
    Duo CPU E6550 @ 2.33Ghz
    3GB Ram
    Dual Monitors - 19" LG Flatrons Model LG1933TR

  2. #2
    Elite Member trogers's Avatar
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    Bangkok, Thailand
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    From your Cablenut settings, I gather your subscribed speeds are 7200/1000 kbps.

    Use the following with Cablenut:

    GlobalMaxTcpWindowSize - 256960
    TcpWindowSize - 256960

    If your given download speed is 10mbps then

    DefaultReceiveWindow should be 10000 x 1024 / 8 = 1280000
    Last edited by trogers; 10-21-07 at 10:01 AM.

  3. #3
    Regular Member iflog's Avatar
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    Am I doing something wrong? Here is the page from j79zrl.

    http://i31.photobucket.com/albums/c384/iflog/cn1.jpg
    Time Warner Cable - Road Runner
    10000/1000
    Windows 7
    Duo CPU E6550 @ 2.33Ghz
    3GB Ram
    Dual Monitors - 19" LG Flatrons Model LG1933TR

  4. #4
    Elite Member trogers's Avatar
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    Bangkok, Thailand
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    Quote Originally Posted by iflog View Post
    Am I doing something wrong? Here is the page from j79zrl.

    http://i31.photobucket.com/albums/c384/iflog/cn1.jpg
    There were 2 errors:

    - That page from j79zrl is not able to accept download speed higher than 7800 kbps.

    - Latency is not equal to ping time of a small 32 bytes packet. It is ping time for a full size 1472 bytes packet. Alternatively, download a large file and do a tracert during the downloading. Your ping time at the end of the tracert is your latency to that website.

    Thus you will need to change the following in the calculation of that page:

    DefaultReceiveWindow - 1280000
    GlobalMaxTcpWindowSize - 256960
    TcpWindowSize - 256960
    Last edited by trogers; 10-21-07 at 11:11 AM.

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