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Thread: need Help please

  1. #1

    need Help please

    Hello
    I have a 10 GB internet connexion (fiber) in Switzerland. With speedtest.net, I have about 1200 mbps download speed
    I have win 10 pro, Intel x540-t2 nic with last drivers and run Tcp optimizer with optimal option. I'm wired, with cat7 cable (cat 6a is the same speed)

    Somebody may help me to increase the download speed ?

    Here is the TCP analyzer report with auto-tuning in normal mode and after in experimental mode. The value of Unscaled RWIN is amazing not ?

    Client OS/browser: Windows 10 (Chrome 73.0.3683.86)

    TCP options string: 020405b40103030801010402
    MSS: 1460
    MTU: 1500
    TCP Window: 262656 (not multiple of MSS)
    RWIN Scaling: 8 bits (2^8=256)
    Unscaled RWIN : 1026
    Recommended RWINs: 64240, 128480, 256960, 513920, 1027840
    BDP limit (200ms): 10506kbps (1313KBytes/s)
    BDP limit (500ms): 4202kbps (525KBytes/s)
    MTU Discovery: ON
    TTL: 47
    Timestamps: OFF
    SACKs: ON
    IP ToS: 11000000 (192)
    Precedence: 110 (Internetwork Control)
    Delay: 0 (normal delay)
    Throughput: 0 (normal throughput)
    Reliability: 0 (normal reliability)
    Cost: 0 (normal cost)
    Check bit: 0 (correct)
    DSCP (DiffServ): CS6 110000 (48) - class 6 (RFC 2474). Similar forwarding behavior to the ToS Precedence field.

    and with auto-tuning in experimental mode

    Client OS/browser: Windows 10 (Chrome 73.0.3683.86)

    TCP options string: 020405b40103030e01010402
    MSS: 1460
    MTU: 1500
    TCP Window: 262144 (not multiple of MSS)
    RWIN Scaling: 14 bits (2^14=16384)
    Unscaled RWIN : 16
    Recommended RWINs: 64240, 128480, 256960, 513920, 1027840
    BDP limit (200ms): 10486kbps (1311KBytes/s)
    BDP limit (500ms): 4194kbps (524KBytes/s)
    MTU Discovery: ON
    TTL: 47
    Timestamps: OFF
    SACKs: ON
    IP ToS: 11000000 (192)
    Precedence: 110 (Internetwork Control)
    Delay: 0 (normal delay)
    Throughput: 0 (normal throughput)
    Reliability: 0 (normal reliability)
    Cost: 0 (normal cost)
    Check bit: 0 (correct)
    DSCP (DiffServ): CS6 110000 (48) - class 6 (RFC 2474). Similar forwarding behavior to the ToS Precedence field.

    Best regards
    Last edited by quentintanguy; 04-06-19 at 02:55 AM.

  2. #2
    Administrator Philip's Avatar
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    You should be careful with setting the autotuning to experimental. Some people report local shares not connecting, some laptops not connecting, etc. I hope MS has fixed it since, but it hasn't been tested thoroughly.


    With Windows 7 and newer, the RWIN value in the Analyzer only shows the "current" TCP Window size, it changes with each packet depending on the current need/line conditions. I agree that the unscaled value is ridiculous, but it scales fast with the new congestion avoidance algorithms.


    You may be hitting a lot of limits at 1200 Mbps - the speed test site, your client computer, etc. You have a 10GbE NIC, but how are is your resource utilization at that speed, i.e. CPU, hdd, etc. I would try achieving higher speed with multiple client PCs, if feasible.

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