why /proc/net/udp is showing wrong rx_queue size in CentOS server?

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I have a java server application.



 while(true)
 
 serverSocket.receive(receivePacket);
 process(receivePacket);
 serverSocket.send(sendPacket);
 try 
 Thread.sleep(10000); // sleep for 10s
 catch (InterruptedException e) 
 e.printStackTrace();


It receives and processes 1 UDP packet / 10 sec.



If I send 10 UDP packets to the server processes 1 packet and then goes to sleep for 10s. so I get the 10th packet's response after 100s.



If I do this is server1 with CentOS release 6.4 (Final).



Server 1: cat /proc/net/udp
 sl local_address rem_address st tx_queue rx_queue tr tm->when retrnsmt uid timeout inode ref pointer drops 
 110: 00000000:10AE 00000000:0000 07 00000000:00000000 00:00000000 00000000 0 0 85635445 2 ffff880836e6d100 0 
 111: 00000000:10AF 00000000:0000 07 00000000:00000000 00:00000000 00000000 0 0 85635446 2 ffff88083913a1c0 0 
 115: 00000000:15B3 00000000:0000 07 00000000:00004FC8 00:00000000 00000000 0 0 390649369 2 ffff880434ae7440 0 
 117: 02FE6341:0035 00000000:0000 07 00000000:00000000 00:00000000 00000000 0 0 353480394 2 ffff8808367f9040 0


If I do this same thing in server 2:



Server 2: cat /proc/net/udp
 sl local_address rem_address st tx_queue rx_queue tr tm->when retrnsmt uid timeout inode ref pointer drops 
 4: FCA9C11F:C36F 8C719AC6:0035 01 00000000:00000000 00:00000000 00000000 0 0 2983494501 2 ffff880169aff4c0 0 
 5: FCA9C11F:D3F0 8C719AC6:0035 01 00000000:00000000 00:00000000 00000000 0 0 2983494485 2 ffff8801b9bbedc0 0 
 16: 7A52BB59:007B 00000000:0000 07 00000000:00000000 00:00000000 00000000 38 0 2438608536 2 ffff8807656764c0 0 
 16: A2EE0D55:007B 00000000:0000 07 00000000:00000000 00:00000000 00000000 38 0 2438608045 2 ffff88077ccdd7c0 0 
 16: A58F466D:007B 00000000:0000 07 00000000:00000000 00:00000000 00000000 38 0 2438607809 2 ffff8801129f6240 0


They are both centos servers and as we can see that the server1's rx_queue buffer is increasing as the application is processing packets slower than data is coming to the server.



I did this exact same thing in server2 but in server2 the rx_queue is not increasing.
what am I doing/understanding wrong?






centos java udp buffer







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    I have a java server application.



     while(true)
     
     serverSocket.receive(receivePacket);
     process(receivePacket);
     serverSocket.send(sendPacket);
     try 
     Thread.sleep(10000); // sleep for 10s
     catch (InterruptedException e) 
     e.printStackTrace();


    It receives and processes 1 UDP packet / 10 sec.



    If I send 10 UDP packets to the server processes 1 packet and then goes to sleep for 10s. so I get the 10th packet's response after 100s.



    If I do this is server1 with CentOS release 6.4 (Final).



    Server 1: cat /proc/net/udp
     sl local_address rem_address st tx_queue rx_queue tr tm->when retrnsmt uid timeout inode ref pointer drops 
     110: 00000000:10AE 00000000:0000 07 00000000:00000000 00:00000000 00000000 0 0 85635445 2 ffff880836e6d100 0 
     111: 00000000:10AF 00000000:0000 07 00000000:00000000 00:00000000 00000000 0 0 85635446 2 ffff88083913a1c0 0 
     115: 00000000:15B3 00000000:0000 07 00000000:00004FC8 00:00000000 00000000 0 0 390649369 2 ffff880434ae7440 0 
     117: 02FE6341:0035 00000000:0000 07 00000000:00000000 00:00000000 00000000 0 0 353480394 2 ffff8808367f9040 0


    If I do this same thing in server 2:



    Server 2: cat /proc/net/udp
     sl local_address rem_address st tx_queue rx_queue tr tm->when retrnsmt uid timeout inode ref pointer drops 
     4: FCA9C11F:C36F 8C719AC6:0035 01 00000000:00000000 00:00000000 00000000 0 0 2983494501 2 ffff880169aff4c0 0 
     5: FCA9C11F:D3F0 8C719AC6:0035 01 00000000:00000000 00:00000000 00000000 0 0 2983494485 2 ffff8801b9bbedc0 0 
     16: 7A52BB59:007B 00000000:0000 07 00000000:00000000 00:00000000 00000000 38 0 2438608536 2 ffff8807656764c0 0 
     16: A2EE0D55:007B 00000000:0000 07 00000000:00000000 00:00000000 00000000 38 0 2438608045 2 ffff88077ccdd7c0 0 
     16: A58F466D:007B 00000000:0000 07 00000000:00000000 00:00000000 00000000 38 0 2438607809 2 ffff8801129f6240 0


    They are both centos servers and as we can see that the server1's rx_queue buffer is increasing as the application is processing packets slower than data is coming to the server.



    I did this exact same thing in server2 but in server2 the rx_queue is not increasing.
    what am I doing/understanding wrong?






    centos java udp buffer







    share|improve this question























      up vote
      0
      down vote

      favorite









      up vote
      0
      down vote

      favorite











      I have a java server application.



       while(true)
       
       serverSocket.receive(receivePacket);
       process(receivePacket);
       serverSocket.send(sendPacket);
       try 
       Thread.sleep(10000); // sleep for 10s
       catch (InterruptedException e) 
       e.printStackTrace();


      It receives and processes 1 UDP packet / 10 sec.



      If I send 10 UDP packets to the server processes 1 packet and then goes to sleep for 10s. so I get the 10th packet's response after 100s.



      If I do this is server1 with CentOS release 6.4 (Final).



      Server 1: cat /proc/net/udp
       sl local_address rem_address st tx_queue rx_queue tr tm->when retrnsmt uid timeout inode ref pointer drops 
       110: 00000000:10AE 00000000:0000 07 00000000:00000000 00:00000000 00000000 0 0 85635445 2 ffff880836e6d100 0 
       111: 00000000:10AF 00000000:0000 07 00000000:00000000 00:00000000 00000000 0 0 85635446 2 ffff88083913a1c0 0 
       115: 00000000:15B3 00000000:0000 07 00000000:00004FC8 00:00000000 00000000 0 0 390649369 2 ffff880434ae7440 0 
       117: 02FE6341:0035 00000000:0000 07 00000000:00000000 00:00000000 00000000 0 0 353480394 2 ffff8808367f9040 0


      If I do this same thing in server 2:



      Server 2: cat /proc/net/udp
       sl local_address rem_address st tx_queue rx_queue tr tm->when retrnsmt uid timeout inode ref pointer drops 
       4: FCA9C11F:C36F 8C719AC6:0035 01 00000000:00000000 00:00000000 00000000 0 0 2983494501 2 ffff880169aff4c0 0 
       5: FCA9C11F:D3F0 8C719AC6:0035 01 00000000:00000000 00:00000000 00000000 0 0 2983494485 2 ffff8801b9bbedc0 0 
       16: 7A52BB59:007B 00000000:0000 07 00000000:00000000 00:00000000 00000000 38 0 2438608536 2 ffff8807656764c0 0 
       16: A2EE0D55:007B 00000000:0000 07 00000000:00000000 00:00000000 00000000 38 0 2438608045 2 ffff88077ccdd7c0 0 
       16: A58F466D:007B 00000000:0000 07 00000000:00000000 00:00000000 00000000 38 0 2438607809 2 ffff8801129f6240 0


      They are both centos servers and as we can see that the server1's rx_queue buffer is increasing as the application is processing packets slower than data is coming to the server.



      I did this exact same thing in server2 but in server2 the rx_queue is not increasing.
      what am I doing/understanding wrong?






      centos java udp buffer







      share|improve this question













      I have a java server application.



       while(true)
       
       serverSocket.receive(receivePacket);
       process(receivePacket);
       serverSocket.send(sendPacket);
       try 
       Thread.sleep(10000); // sleep for 10s
       catch (InterruptedException e) 
       e.printStackTrace();


      It receives and processes 1 UDP packet / 10 sec.



      If I send 10 UDP packets to the server processes 1 packet and then goes to sleep for 10s. so I get the 10th packet's response after 100s.



      If I do this is server1 with CentOS release 6.4 (Final).



      Server 1: cat /proc/net/udp
       sl local_address rem_address st tx_queue rx_queue tr tm->when retrnsmt uid timeout inode ref pointer drops 
       110: 00000000:10AE 00000000:0000 07 00000000:00000000 00:00000000 00000000 0 0 85635445 2 ffff880836e6d100 0 
       111: 00000000:10AF 00000000:0000 07 00000000:00000000 00:00000000 00000000 0 0 85635446 2 ffff88083913a1c0 0 
       115: 00000000:15B3 00000000:0000 07 00000000:00004FC8 00:00000000 00000000 0 0 390649369 2 ffff880434ae7440 0 
       117: 02FE6341:0035 00000000:0000 07 00000000:00000000 00:00000000 00000000 0 0 353480394 2 ffff8808367f9040 0


      If I do this same thing in server 2:



      Server 2: cat /proc/net/udp
       sl local_address rem_address st tx_queue rx_queue tr tm->when retrnsmt uid timeout inode ref pointer drops 
       4: FCA9C11F:C36F 8C719AC6:0035 01 00000000:00000000 00:00000000 00000000 0 0 2983494501 2 ffff880169aff4c0 0 
       5: FCA9C11F:D3F0 8C719AC6:0035 01 00000000:00000000 00:00000000 00000000 0 0 2983494485 2 ffff8801b9bbedc0 0 
       16: 7A52BB59:007B 00000000:0000 07 00000000:00000000 00:00000000 00000000 38 0 2438608536 2 ffff8807656764c0 0 
       16: A2EE0D55:007B 00000000:0000 07 00000000:00000000 00:00000000 00000000 38 0 2438608045 2 ffff88077ccdd7c0 0 
       16: A58F466D:007B 00000000:0000 07 00000000:00000000 00:00000000 00000000 38 0 2438607809 2 ffff8801129f6240 0


      They are both centos servers and as we can see that the server1's rx_queue buffer is increasing as the application is processing packets slower than data is coming to the server.



      I did this exact same thing in server2 but in server2 the rx_queue is not increasing.
      what am I doing/understanding wrong?






      centos java udp buffer




      centos java udp buffer






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      asked 20 mins ago









      Al-Alamin

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