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












1















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?










share|improve this question























  • What kernel version on the two servers?

    – Neopallium
    Nov 23 '18 at 9:02
















1















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?










share|improve this question























  • What kernel version on the two servers?

    – Neopallium
    Nov 23 '18 at 9:02














1












1








1


1






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?










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






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked Nov 8 '18 at 6:16









Al-AlaminAl-Alamin

1063




1063













  • What kernel version on the two servers?

    – Neopallium
    Nov 23 '18 at 9:02



















  • What kernel version on the two servers?

    – Neopallium
    Nov 23 '18 at 9:02

















What kernel version on the two servers?

– Neopallium
Nov 23 '18 at 9:02





What kernel version on the two servers?

– Neopallium
Nov 23 '18 at 9:02










2 Answers
2






active

oldest

votes


















1














I am seeing a similar problem on Ubuntu 18.04 LTS (kernel 4.15.0-38). But it doesn't happen on my Debian 9.5 (kernel 4.9.110-3) box. Seems to be a bug in newer kernels?



A simple way to reproduce the problem is with netcat. client and server can be local or on different boxes.




  1. Run netcat server in one terminal: nc -u -l 1234

  2. Run netcat client in another terminal: nc -u 127.0.0.1 1234

  3. type a short message "a" in the client and press enter.

  4. in a third terminal check the recv-q lengths: netstat -plan | grep 1234


On Ubuntu the receiving udp socket will have a non-empty recv-q (768 bytes for a 2 byte message) even though netcat has read the message from the socket and printed it. I have ween the recv-q keep growing until about 52k, then it resets back to zero.



On Debian the recv-q is always zero as long as the udp socket is drained faster then packets are received.



Also found this kernel bug report: UDP rx_queue incorrect calculation in /proc/net/udp






share|improve this answer

































    1














    Pardon me being new to this part of StackExchange so I'm posting an answer instead of a comment.



    I'm getting the same problem as @Neopallium, on Ubuntu 18.04 LTS (kernel 4.15.0-36). From my testing, artificially setting net.core.rmem_max=26214400 and net.core.rmem_default=26214400 (that is, 25MB respectively) and running my UDP server application with no UDP datagram backlogs throughout the test, I see the rx_queue counter go up to about 00000000:006xxxxx or ~6MB+ and suddenly then the counter resets to 0. This is at about 1/4 of the net.core.rmem_max before the counter resets. On Ubuntu 18.04 LTS the default values of net.core.rmem_default and net.core.rmem_max is 212992 and hence it's no surprise @Neopallium is seeing his counter go up to about 52k (about 1/4 of 212k before it resets.



    Here's the output of the application in /proc/net/udp nearing the point of reset:



     sl  local_address rem_address   st tx_queue rx_queue tr tm->when retrnsmt   uid  timeout inode ref pointer drops
    1256: 00000000:7530 00000000:0000 07 00000000:00632240 00:00000000 00000000 0 0 94457826 2 0000000000000000 0



    Here's the screeny of my grafana socket graph over the last 45 mins:



    enter image description here
    Like @Neopallium I'm inclined to believe it's a kernel bug.






    share|improve this answer























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      2 Answers
      2






      active

      oldest

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      2 Answers
      2






      active

      oldest

      votes









      active

      oldest

      votes






      active

      oldest

      votes









      1














      I am seeing a similar problem on Ubuntu 18.04 LTS (kernel 4.15.0-38). But it doesn't happen on my Debian 9.5 (kernel 4.9.110-3) box. Seems to be a bug in newer kernels?



      A simple way to reproduce the problem is with netcat. client and server can be local or on different boxes.




      1. Run netcat server in one terminal: nc -u -l 1234

      2. Run netcat client in another terminal: nc -u 127.0.0.1 1234

      3. type a short message "a" in the client and press enter.

      4. in a third terminal check the recv-q lengths: netstat -plan | grep 1234


      On Ubuntu the receiving udp socket will have a non-empty recv-q (768 bytes for a 2 byte message) even though netcat has read the message from the socket and printed it. I have ween the recv-q keep growing until about 52k, then it resets back to zero.



      On Debian the recv-q is always zero as long as the udp socket is drained faster then packets are received.



      Also found this kernel bug report: UDP rx_queue incorrect calculation in /proc/net/udp






      share|improve this answer






























        1














        I am seeing a similar problem on Ubuntu 18.04 LTS (kernel 4.15.0-38). But it doesn't happen on my Debian 9.5 (kernel 4.9.110-3) box. Seems to be a bug in newer kernels?



        A simple way to reproduce the problem is with netcat. client and server can be local or on different boxes.




        1. Run netcat server in one terminal: nc -u -l 1234

        2. Run netcat client in another terminal: nc -u 127.0.0.1 1234

        3. type a short message "a" in the client and press enter.

        4. in a third terminal check the recv-q lengths: netstat -plan | grep 1234


        On Ubuntu the receiving udp socket will have a non-empty recv-q (768 bytes for a 2 byte message) even though netcat has read the message from the socket and printed it. I have ween the recv-q keep growing until about 52k, then it resets back to zero.



        On Debian the recv-q is always zero as long as the udp socket is drained faster then packets are received.



        Also found this kernel bug report: UDP rx_queue incorrect calculation in /proc/net/udp






        share|improve this answer




























          1












          1








          1







          I am seeing a similar problem on Ubuntu 18.04 LTS (kernel 4.15.0-38). But it doesn't happen on my Debian 9.5 (kernel 4.9.110-3) box. Seems to be a bug in newer kernels?



          A simple way to reproduce the problem is with netcat. client and server can be local or on different boxes.




          1. Run netcat server in one terminal: nc -u -l 1234

          2. Run netcat client in another terminal: nc -u 127.0.0.1 1234

          3. type a short message "a" in the client and press enter.

          4. in a third terminal check the recv-q lengths: netstat -plan | grep 1234


          On Ubuntu the receiving udp socket will have a non-empty recv-q (768 bytes for a 2 byte message) even though netcat has read the message from the socket and printed it. I have ween the recv-q keep growing until about 52k, then it resets back to zero.



          On Debian the recv-q is always zero as long as the udp socket is drained faster then packets are received.



          Also found this kernel bug report: UDP rx_queue incorrect calculation in /proc/net/udp






          share|improve this answer















          I am seeing a similar problem on Ubuntu 18.04 LTS (kernel 4.15.0-38). But it doesn't happen on my Debian 9.5 (kernel 4.9.110-3) box. Seems to be a bug in newer kernels?



          A simple way to reproduce the problem is with netcat. client and server can be local or on different boxes.




          1. Run netcat server in one terminal: nc -u -l 1234

          2. Run netcat client in another terminal: nc -u 127.0.0.1 1234

          3. type a short message "a" in the client and press enter.

          4. in a third terminal check the recv-q lengths: netstat -plan | grep 1234


          On Ubuntu the receiving udp socket will have a non-empty recv-q (768 bytes for a 2 byte message) even though netcat has read the message from the socket and printed it. I have ween the recv-q keep growing until about 52k, then it resets back to zero.



          On Debian the recv-q is always zero as long as the udp socket is drained faster then packets are received.



          Also found this kernel bug report: UDP rx_queue incorrect calculation in /proc/net/udp







          share|improve this answer














          share|improve this answer



          share|improve this answer








          edited Nov 23 '18 at 9:34

























          answered Nov 23 '18 at 9:16









          NeopalliumNeopallium

          1214




          1214

























              1














              Pardon me being new to this part of StackExchange so I'm posting an answer instead of a comment.



              I'm getting the same problem as @Neopallium, on Ubuntu 18.04 LTS (kernel 4.15.0-36). From my testing, artificially setting net.core.rmem_max=26214400 and net.core.rmem_default=26214400 (that is, 25MB respectively) and running my UDP server application with no UDP datagram backlogs throughout the test, I see the rx_queue counter go up to about 00000000:006xxxxx or ~6MB+ and suddenly then the counter resets to 0. This is at about 1/4 of the net.core.rmem_max before the counter resets. On Ubuntu 18.04 LTS the default values of net.core.rmem_default and net.core.rmem_max is 212992 and hence it's no surprise @Neopallium is seeing his counter go up to about 52k (about 1/4 of 212k before it resets.



              Here's the output of the application in /proc/net/udp nearing the point of reset:



               sl  local_address rem_address   st tx_queue rx_queue tr tm->when retrnsmt   uid  timeout inode ref pointer drops
              1256: 00000000:7530 00000000:0000 07 00000000:00632240 00:00000000 00000000 0 0 94457826 2 0000000000000000 0



              Here's the screeny of my grafana socket graph over the last 45 mins:



              enter image description here
              Like @Neopallium I'm inclined to believe it's a kernel bug.






              share|improve this answer




























                1














                Pardon me being new to this part of StackExchange so I'm posting an answer instead of a comment.



                I'm getting the same problem as @Neopallium, on Ubuntu 18.04 LTS (kernel 4.15.0-36). From my testing, artificially setting net.core.rmem_max=26214400 and net.core.rmem_default=26214400 (that is, 25MB respectively) and running my UDP server application with no UDP datagram backlogs throughout the test, I see the rx_queue counter go up to about 00000000:006xxxxx or ~6MB+ and suddenly then the counter resets to 0. This is at about 1/4 of the net.core.rmem_max before the counter resets. On Ubuntu 18.04 LTS the default values of net.core.rmem_default and net.core.rmem_max is 212992 and hence it's no surprise @Neopallium is seeing his counter go up to about 52k (about 1/4 of 212k before it resets.



                Here's the output of the application in /proc/net/udp nearing the point of reset:



                 sl  local_address rem_address   st tx_queue rx_queue tr tm->when retrnsmt   uid  timeout inode ref pointer drops
                1256: 00000000:7530 00000000:0000 07 00000000:00632240 00:00000000 00000000 0 0 94457826 2 0000000000000000 0



                Here's the screeny of my grafana socket graph over the last 45 mins:



                enter image description here
                Like @Neopallium I'm inclined to believe it's a kernel bug.






                share|improve this answer


























                  1












                  1








                  1







                  Pardon me being new to this part of StackExchange so I'm posting an answer instead of a comment.



                  I'm getting the same problem as @Neopallium, on Ubuntu 18.04 LTS (kernel 4.15.0-36). From my testing, artificially setting net.core.rmem_max=26214400 and net.core.rmem_default=26214400 (that is, 25MB respectively) and running my UDP server application with no UDP datagram backlogs throughout the test, I see the rx_queue counter go up to about 00000000:006xxxxx or ~6MB+ and suddenly then the counter resets to 0. This is at about 1/4 of the net.core.rmem_max before the counter resets. On Ubuntu 18.04 LTS the default values of net.core.rmem_default and net.core.rmem_max is 212992 and hence it's no surprise @Neopallium is seeing his counter go up to about 52k (about 1/4 of 212k before it resets.



                  Here's the output of the application in /proc/net/udp nearing the point of reset:



                   sl  local_address rem_address   st tx_queue rx_queue tr tm->when retrnsmt   uid  timeout inode ref pointer drops
                  1256: 00000000:7530 00000000:0000 07 00000000:00632240 00:00000000 00000000 0 0 94457826 2 0000000000000000 0



                  Here's the screeny of my grafana socket graph over the last 45 mins:



                  enter image description here
                  Like @Neopallium I'm inclined to believe it's a kernel bug.






                  share|improve this answer













                  Pardon me being new to this part of StackExchange so I'm posting an answer instead of a comment.



                  I'm getting the same problem as @Neopallium, on Ubuntu 18.04 LTS (kernel 4.15.0-36). From my testing, artificially setting net.core.rmem_max=26214400 and net.core.rmem_default=26214400 (that is, 25MB respectively) and running my UDP server application with no UDP datagram backlogs throughout the test, I see the rx_queue counter go up to about 00000000:006xxxxx or ~6MB+ and suddenly then the counter resets to 0. This is at about 1/4 of the net.core.rmem_max before the counter resets. On Ubuntu 18.04 LTS the default values of net.core.rmem_default and net.core.rmem_max is 212992 and hence it's no surprise @Neopallium is seeing his counter go up to about 52k (about 1/4 of 212k before it resets.



                  Here's the output of the application in /proc/net/udp nearing the point of reset:



                   sl  local_address rem_address   st tx_queue rx_queue tr tm->when retrnsmt   uid  timeout inode ref pointer drops
                  1256: 00000000:7530 00000000:0000 07 00000000:00632240 00:00000000 00000000 0 0 94457826 2 0000000000000000 0



                  Here's the screeny of my grafana socket graph over the last 45 mins:



                  enter image description here
                  Like @Neopallium I'm inclined to believe it's a kernel bug.







                  share|improve this answer












                  share|improve this answer



                  share|improve this answer










                  answered Feb 12 at 17:45









                  L. J.L. J.

                  112




                  112






























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