Network

You can run the sar or ifconfig command to check the network status on each node in openGauss and analyze whether performance bottlenecks caused by network faults occur.

Checking Network Status

Check the server network status using either of the following two methods:

SIA1000056771:~ # ifconfig
eth0      Link encap:Ethernet  HWaddr 28:6E:D4:86:7D:D5  
          inet addr:10.180.123.163  Bcast:10.180.123.255  Mask:255.255.254.0
          inet6 addr: fe80::2a6e:d4ff:fe86:7dd5/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:5669314 errors:0 dropped:0 overruns:0 frame:0
          TX packets:4955927 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:508077795 (484.5 Mb)  TX bytes:818004366 (780.1 Mb)

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:711938 errors:0 dropped:0 overruns:0 frame:0
          TX packets:711938 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:164158862 (156.5 Mb)  TX bytes:164158862 (156.5 Mb)

errors indicates the total number of error packets received.
dropped indicates the number of packets that have reached the ring buffer but are discarded before being copied to the memory due to system faults, for example, insufficient memory.
overruns indicates the number of packets that have been discarded from the ring buffer. They are discarded because the kernel is incapable of processing ring buffer (a.k.a. Driver Queue) transmission.

In the command output, if the values of the three parameters keep increasing, the network is overloaded or hardware (such as NICs and memory) faults exist.

Run the sar command to check the network connection.

sar -n DEV 1  // 1 indicates the interval.
Average: IFACE  rxpck/s  txpck/s    rxkB/s    txkB/s rxcmp/s txcmp/s rxmcst/s %ifutil
Average:    lo  1926.94  1926.94  25573.92  25573.92    0.00    0.00     0.00    0.00
Average:  A1-0     0.00     0.00      0.00      0.00    0.00    0.00     0.00    0.00
Average:  A1-1     0.00     0.00      0.00      0.00    0.00    0.00     0.00    0.00
Average:  NIC0     5.17     1.48      0.44      0.92    0.00    0.00     0.00    0.00
Average:  NIC1     0.00     0.00      0.00      0.00    0.00    0.00     0.00    0.00
Average:  A0-0  8173.06 92420.66  97102.22 133305.09    0.00    0.00     0.00    0.00
Average:  A0-1 11431.37  9373.06 156950.45    494.40    0.00    0.00     0.00    0.00
Average:  B3-0     0.00     0.00      0.00      0.00    0.00    0.00     0.00    0.00
Average:  B3-1     0.00     0.00      0.00      0.00    0.00    0.00     0.00    0.00

rxkB/s indicates the number of kilobytes of data received per second and txkB/s indicates the number of those sent per second.

In the command output, check whether the amount of data received and sent by any NIC has reached the upper limit.

After the check, press Ctrl+Z to exit.