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    Subjectrcv_wnd = init_cwnd*mss
    Date
    From

    What is the reason for checking mss with 1<<rcv_wscale?
    include/net/tcp.h:
    static inline void tcp_select_initial_window(int __space, __u32 mss,
    __u32 *rcv_wnd,
    __u32 *window_clamp,
    int wscale_ok,
    __u8 *rcv_wscale)
    {
    .....
    /* Set initial window to value enough for senders,
    * following RFC1414. Senders, not following this RFC,
    * will be satisfied with 2.
    */
    if (mss > (1<<*rcv_wscale)) {
    int init_cwnd = 4;
    if (mss > 1460*3)
    init_cwnd = 2;
    else if (mss > 1460)
    init_cwnd = 3;
    if (*rcv_wnd > init_cwnd*mss)
    *rcv_wnd = init_cwnd*mss;
    }
    ......
    }
    ---------
    Perhaps the motivation was checking for
    if (mss > rcv_wnd * (1<<*rcv_wscale)) {



    Thanks,
    Prasanna.
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