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Thread: how to set RWIN??

  1. #1
    Junior Member
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    how to set RWIN??

    i have been set the value of RWIN to 256960.
    but Analyzer only show 65536.
    what problem??


    Default TCP Receive Window (RWIN) = 65536
    RWIN Scaling (RFC1323) = 8 bits (scale factor of 16)
    Unscaled TCP Receive Window = 256

    In Windows Vista, unless you have disabled "TCP/IP Auto-Tuning", readings in the Analyzer will only show the Current TCP Window, and the TCP Optimizer will have no effect.
    RWIN is not fully optimized (even though it is a comparatively large number). The unscaled RWIN value is lower than it should be. Also, RWIN being close to and above 65535 does not justify the header overhead of enabling TCP 1323 Options. You might want to use one of the recommended RWIN values below.

    For optimum performance, consider changing RWIN to a multiple of MSS.
    Other RWIN values that might work well with your current MTU/MSS:
    513920 (MSS x 44 * scale factor of 8)
    256960 (MSS x 44 * scale factor of 4)
    128480 (MSS x 44 * scale factor of 2)
    64240 (MSS x 44)
    SpeedGuide.net TCP Analyzer Results
    Tested on: 06.13.2008 20:41

    TCP options string: 020405b40103030801010402
    MSS: 1460
    MTU: 1500
    TCP Window: 65536 (NOT multiple of MSS)
    RWIN Scaling: 8
    Unscaled RWIN : 256
    Reccomended RWINs: 64240, 128480, 256960, 513920
    BDP limit (200ms): 2621kbps (328KBytes/s)
    BDP limit (500ms): 1049kbps (131KBytes/s)
    MTU Discovery: ON
    TTL: 40
    Timestamps: OFF
    SACKs: ON
    IP ToS: 00000000 (0)

  2. #2
    SG Enthusiast Rollingstone's Avatar
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    It's auto-tuning in Vista, Vista cannot be tweaked with TCP Optimizer
    http://forums.speedguide.net/showthread.php?t=240256
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  3. #3
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    Quote Originally Posted by Rollingstone View Post
    It's auto-tuning in Vista, Vista cannot be tweaked with TCP Optimizer
    http://forums.speedguide.net/showthread.php?t=240256
    i have tried to disable auto tuning and usage a tcp/ip patch
    whereas it shows 65536 too.

    RWIN is not fully optimized .

    how to set to fully optimize.?????
    Last edited by angus203; 06-14-08 at 02:56 AM.

  4. #4
    SG Enthusiast Rollingstone's Avatar
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    Best to activate auto-tuning in Vista.
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  5. #5
    Elite Member trogers's Avatar
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    Quote Originally Posted by angus203 View Post
    i have tried to disable auto tuning and usage a tcp/ip patch
    whereas it shows 65536 too.
    Vista has no registry value that you can manually set a RWIN value. Thus you cannot tweak RWIN. If you disable auto-tuning, RWIN will be set to 64240 as default with RWIN scaling at zero.
    "Contentment is not the fulfillment of what you want, but is the realisation of how much you already have" - anon

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