如何在android中計算丟包？

Question

我們如何計算所有網絡或在android中計算特定的網絡包丟失？

Answer 1

對於TCP，可能有可能獲取Linux級別的值，但不能在Java/Android級別獲取值。

對於UDP，這是不可能的，因爲沒有可用於檢測數據包丟失的數據。如果你想計算UDP層面上的數據丟失，你必須實現你自己的基於UDP的協議，並且包括例如數據包計數器。但是，這將允許您僅爲自己的協議計算數據包丟失，而不是在一般水平上。

Answer 2

爲了擴展Robert的回答，UDP是一個數據報盡力而爲的傳送協議，沒有任何會話，按序傳送或錯誤檢測的概念。如果你想檢測錯誤，你可能會實現很多TCP（至少，序列號，校驗和和確認）。

幸運的是，對於TCP，內核跟蹤詳細的統計數據。標準ip實用程序應該在這裏有所幫助。在我的SGS2上，該實用程序是完整的，並不像ifconfig那樣減少。

用法示例：

root@android:/etC# ip -s -s link 
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN 
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 
    RX: bytes packets errors dropped overrun mcast 
    23692  410  0  0  0  0  
    RX errors: length crc  frame fifo missed 
       0  0  0  0  0  
    TX: bytes packets errors dropped carrier collsns 
    23692  410  0  0  0  0  
    TX errors: aborted fifo window heartbeat 
       0  0  0  0  
2: gannet0: <BROADCAST,MULTICAST,NOARP,UP,LOWER_UP> mtu 1000 qdisc pfifo_fast state UNKNOWN qlen 1000 
    link/ether 72:e0:e5:0a:dc:d6 brd ff:ff:ff:ff:ff:ff 
    RX: bytes packets errors dropped overrun mcast 
    0   0  0  0  0  0  
    RX errors: length crc  frame fifo missed 
       0  0  0  0  0  
    TX: bytes packets errors dropped carrier collsns 
    0   0  0  0  0  0  
    TX errors: aborted fifo window heartbeat 
       0  0  0  0  
3: sit0: <NOARP,UP,LOWER_UP> mtu 1480 qdisc noqueue state UNKNOWN 
    link/sit 0.0.0.0 brd 0.0.0.0 
    RX: bytes packets errors dropped overrun mcast 
    0   0  0  0  0  0  
    RX errors: length crc  frame fifo missed 
       0  0  0  0  0  
    TX: bytes packets errors dropped carrier collsns 
    0   0  59  0  0  0  
    TX errors: aborted fifo window heartbeat 
       0  0  0  0  
4: ip6tnl0: <NOARP,UP,LOWER_UP> mtu 1452 qdisc noqueue state UNKNOWN 
    link/tunnel6 :: brd :: 
    RX: bytes packets errors dropped overrun mcast 
    0   0  0  0  0  0  
    RX errors: length crc  frame fifo missed 
       0  0  0  0  0  
    TX: bytes packets errors dropped carrier collsns 
    0   0  62  62  0  0  
    TX errors: aborted fifo window heartbeat 
       0  0  0  0  
5: rmnet0: <POINTOPOINT,MULTICAST,NOARP> mtu 1500 qdisc pfifo_fast state DOWN qlen 1000 
    link/ppp 
    RX: bytes packets errors dropped overrun mcast 
    1410177 2037  0  0  0  0  
    RX errors: length crc  frame fifo missed 
       0  0  0  0  0  
    TX: bytes packets errors dropped carrier collsns 
    199870  1831  0  0  0  0  
    TX errors: aborted fifo window heartbeat 
       0  0  0  0  
6: rmnet1: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 1000 
    link/ppp 
    RX: bytes packets errors dropped overrun mcast 
    0   0  0  0  0  0  
    RX errors: length crc  frame fifo missed 
       0  0  0  0  0  
    TX: bytes packets errors dropped carrier collsns 
    0   0  0  0  0  0  
    TX errors: aborted fifo window heartbeat 
       0  0  0  0  
7: rmnet2: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 1000 
    link/ppp 
    RX: bytes packets errors dropped overrun mcast 
    0   0  0  0  0  0  
    RX errors: length crc  frame fifo missed 
       0  0  0  0  0  
    TX: bytes packets errors dropped carrier collsns 
    0   0  0  0  0  0  
    TX errors: aborted fifo window heartbeat 
       0  0  0  0  

我的手機紮根但是這絕對不是一個要求。