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    rsync 2.6.8中的"--sockopts"并不能真正起作用, 所以只有自已改了. 在sender.c中加上如下红色部分代码:

if (is_a_socket(f_out))
{
   set_socket_options(f_out, "SO_SNDBUF=524288");
   set_socket_options(f_out, "SO_RCVBUF=524288");
   if (verbose)
   {
     int sndbuf,rcvbuf,len;
     len = sizeof(sndbuf);
     getsockopt(f_out, SOL_SOCKET, SO_SNDBUF,&sndbuf, &len);
     len = sizeof(rcvbuf);
     getsockopt(f_out, SOL_SOCKET, SO_RCVBUF,&rcvbuf, &len);
     rprintf(FINFO, "Sender TCP options : SO_SNDBUF = %d, SO_RCVBUF=%d\n",  sndbuf, rcvbuf);
   }
}

if (!do_xfers) { /* log the transfer */
        if (!am_server && log_format)

    在receiver.c中加上如下红色部分代码:

if (is_a_socket(f_in))
{
   set_socket_options(f_in, "SO_RCVBUF=524288");
    set_socket_options(f_in,"SO_SNDBUF=524288");
   if (verbose)
   {
     int sndbuf,rcvbuf,len;
     len = sizeof(sndbuf);
     getsockopt(f_in, SOL_SOCKET, SO_SNDBUF,&sndbuf, &len);
     len = sizeof(rcvbuf);
     getsockopt(f_in, SOL_SOCKET, SO_RCVBUF,&rcvbuf, &len);
     rprintf(FINFO, "Receiver TCP options : SO_SNDBUF = %d, SO_RCVBUF=%d\n",  sndbuf, rcvbuf);
   }
}
while ((i = recv_token(f_in, &data)) != 0) {

    在rsync.h中将以下两个的值改为256KB:

#define WRITE_SIZE (256*1024)
#define CHUNK_SIZE (256*1024)

    在rsync中用-alvvvv检验更改结果:

......
Sender TCP options : SO_SNDBUF = 524288, SO_RCVBUF=524288
......
Receiver TCP options : SO_SNDBUF = 524288, SO_RCVBUF=57344
data recv 262144 at 0
data recv 262144 at 262144
data recv 262144 at 524288
data recv 262144 at 786432
data recv 262144 at 1048576
data recv 262144 at 1310720
data recv 262144 at 1572864
data recv 262144 at 1835008
data recv 262144 at 2097152
data recv 228348 at 2359296
......

    结果还在检验之中...