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Resolve the "Cannot get device ring settings" error on CentOS 6.5

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This topic explains how to resolve the "Cannot get device ring settings: Operation not supported" error on a CentOS 6.5 ECS instance.

Symptoms

When you run the ethtool -g eth0 command on an ECS instance that runs CentOS 6.5 to view the buffer capacity of the network interface, the command returns the following output:

Ring parameters for eth0:
Cannot get device ring settings: Operation not supported

Cause

The ECS instance does not support querying the ring buffer using the -g parameter.

Solution

To view the buffer capacity of the network interface, run the ifconfig command and check the txqueuelen parameter in the output.

Note

CentOS 6 has reached its end of life (EOL). According to community rules, the content of the CentOS 6 sources has been removed. An error will occur if you continue to use the default source configuration on a CentOS 6 system. Before you proceed, switch the CentOS 6 source. For more information, see How do I switch sources after CentOS 6 reaches EOL?.

ifconfig
eth0      Link encap:Ethernet  HWaddr 00:16:3E:21:1E:35
          inet addr:10.30.84.112  Bcast:10.30.87.255  Mask:255.255.252.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:4773 errors:0 dropped:0 overruns:0 frame:0
          TX packets:4555 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:35037815 (33.4 MiB)  TX bytes:437705 (427.4 KiB)
eth1      Link encap:Ethernet  HWaddr 00:16:3E:2F:33:9E
          inet addr:47.100.245.86  Bcast:47.100.255.255  Mask:255.255.224.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:39865 errors:0 dropped:0 overruns:0 frame:0
          TX packets:9481 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:54789136 (52.2 MiB)  TX bytes:635972 (621.0 KiB)
lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)