bcc-netqtop - Man Page

netqtop [-n nic] [-i interval] [-t throughput]

netqtop accounts statistics of both transmitted and received packets on each queue of  a specified network interface to help developers check if its traffic load is balanced.  The result is displayed as a table with columns of PPS, BPS, average size and  packet counts in range [0,64), [64, 5120), [512, 2048), [2048, 16K), [16K, 64K).  This is printed every given interval (default 1) in seconds.

The tool uses the net:net_dev_start_xmit and net:netif_receive_skb kernel tracepoints.  Since it uses tracepoint, the tool only works on Linux 4.7+.

netqtop introduces significant overhead while network traffic is large. See Overhead  section below.

CONFIG_bpf and bcc

-n NIC

Specify the network interface card

-i INTERVAL

Print results every INTERVAL seconds. The default value is 1.

-t THROUGHPUT

Print BPS and PPS of each queue.

Account statistics of eth0 and output every 2 seconds:

# netqtop -n eth0 -i 1

In performance test, netqtop introduces a overhead up to 30% PPS drop  while printing interval is set to 1 second. So be mindful of potential packet drop  when using this tool.

It also increases ping-pong latency by about 1 usec.

This is from bcc

https://github.com/iovisor/bcc

Also look in the bcc distribution for a netqtop_example.txt file containing example usage, output and commentary for this tool.

Linux

Unstable - in development

Yolandajn