How to determine the current length of the NIC queue

https://access.redhat.com/solutions/1293784

 SOLUTION UNVERIFIED - 已更新 2015年一月15日06:32 - 

English 

环境

• Red Hat Enterprise Linux (RHEL) 6

问题

• What is the current length of the NIC queue?
• How do I get the current depth of the 3 queues that make up the pfifo_fast qdisc?

决议

The pfifo_fast qdisc, among others, is actually determined by the txqueuelength depth seen in ethtool:

Raw

# ifconfig eth0
      collisions:0 txqueuelen:1000 

Or look in /sys for the tx_queue_len value:

Raw

# cat /sys/class/net/eth0/tx_queue_len
1000

The tc command will show additional qdisc stats:

Raw

# tc -s -d qdisc show