Socket的setReceiveBufferSize设置结果不对

在java项目里，socket连接后加入如下代码:

 System.out.println("rsize: "+socket.getReceiveBufferSize());
 socket.setReceiveBufferSize(120);
 System.out.println("rsize: "+socket.getReceiveBufferSize());

会得到结果:

rsize: 65536
rsize: 120

但如果在安卓里加入类似代码:

Log.e("xjfjian", "rsize: "+mSocket.getReceiveBufferSize());
mSocket.setReceiveBufferSize(120);
Log.e("xjfjian", "rsize: "+mSocket.getReceiveBufferSize());

结果不确定：
安卓9，as自带模拟器：

xjfjian: rsize: 1059840
xjfjian: rsize: 2304

安卓5，夜神模拟器：

xjfjian: rsize: 1048576
xjfjian: rsize: 2240

想了解一下原因，是安卓本身的问题还是模拟器的问题？以及有没有办法规避这个问题？