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Thread: Tweaked Comcast cable and got slower speed

  1. #1
    Mondo
    Guest

    Tweaked Comcast cable and got slower speed

    First time testing untweaked got a rating of 1720 on DSLreports test.

    Tweaked with Speeguide.net WIN2k tweak and got 1400.

    Tried correcting with Dr. TCP got 800

    Did windows default with TCP optimizier and got 760

    Tried correcting with TCP Optimizer optimal settings and got 1020

    Here are the results. Thanks to anyone that can help

    Receive Window (RWIN): 256960
    Window Scaling: 2
    Path MTU Discovery: ON
    RFC1323 Window Scaling: ON
    RFC1323 Time Stamping: OFF
    Selective Acks: ON
    MSS requested: 1460
    TTL:
    (less any hops behind firewall)
    66
    TTL remaining: 52

    Notes and recommendations:
    Choose RWIN between 16060 and 43800 (FAQ #586)
    download/use DRTCP .. (FAQ #578)
    Read the tweak FAQ


    Example 146000 byte download
    Actual data bytes sent: 150380
    Actual data packets: 103
    Max packet sent (MTU): 1500
    Max packet recd (MTU): 1500
    Retransmitted data packets: 3
    sacks you sent: 0
    pushed data pkts: 3
    data transmit time: 0.835 secs
    our max idletime: 444.2 ms
    transfer rate: 141284 bytes/sec
    transfer rate: 1130 kbits/sec
    This is not a speed test!
    transfer efficiency: 97%


    Notes and recommendations:
    Good data stream (no/few rexmits)


    ICMP (ping) check
    Minimum ping: 12 ms
    Maximum ping: 38 ms
    Ping stability:
    27 18 27 16 29 38 12 18 35 14

  2. #2
    Regular Member j79zlr's Avatar
    Join Date
    Apr 2003
    Posts
    242
    Download Cablenut and use these settings:

    DefaultReceiveWindow = 230400
    DefaultSendWindow = 16384
    DisableAddressSharing = 1
    InitialLargeBufferCount = 200
    InitialMediumBufferCount = 480
    InitialSmallBufferCount = 640
    LargeBufferSize = 819200
    MaxFastTransmit = 64000
    MediumBufferSize = 150400
    Priority Boost = 0
    SmallBufferSize = 12800
    TransmitWorker = 32
    FastSendDatagramThreshhold = 4096
    EnableFastRouteLookup = 1
    EnablePMTUDiscovery = 1
    IgnorePushBitsOnReceives = 0
    GlobalMaxTcpWindowSize = 46720
    MaxFreeTcbs = 8000
    MaxHashTableSize = 16384
    MaxNormLookupMemory = 5000000
    SackOpts = 1
    SynAttackProtect = 1
    Tcp1323Opts = 0
    TcpLogLevel = 1
    TcpMaxDupAttacks = 3
    TcpMaxHalfOpen = 100
    TcpMaxHalfOpenRetired = 80
    TcpRecvSegmentSize = 1460
    TcpSendSegmentSize = 1460
    TcpTimedWaitDelay = 30
    TcpUseRFC1122UrgentPointer = 0
    TcpWindowSize = 46720
    MaxConnectionsPer1_0Server = 10
    MaxConnectionsPerServer = 8
    DefaultTimeToLive = 64
    DefaultUserTOSSetting = 0
    TcpMaxDataRetransmissions = 6
    DefaultTOSValue = 92

  3. #3
    Mondo
    Guest
    Thanks! I'll let you know how it goes.

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