gistfile1.txt

static int
tcp_sysctl_rfc3390_handler(SYSCTL_HANDLER_ARGS)
{
        int err;
        int new;

        err = sysctl_handle_int(oidp, &new, 0, req);
        if (err || !req->newptr)
                return (err);

        if (new == 1) {
                V_tcp_initcwnd_segments = 4;
                V_tcp_initcwnd_bytes = 4380;
        }
        else
                err = EINVAL;

        return (err);
}