2.16.2.16. Yardstick Test Case Description TC043

Network Latency Between NFVI Nodes
test case id OPNFV_YARDSTICK_TC043_LATENCY_BETWEEN_NFVI_NODES
metric RTT (Round Trip Time)
test purpose

The purpose of TC043 is to do a basic verification that network latency is within acceptable boundaries when packets travel between different NFVI nodes.

The purpose is also to be able to spot the trends. Test results, graphs and similar shall be stored for comparison reasons and product evolution understanding between different OPNFV versions and/or configurations.

test tool

ping

Ping is a computer network administration software utility used to test the reachability of a host on an Internet Protocol (IP) network. It measures the round-trip time for packet sent from the originating host to a destination computer that are echoed back to the source.

test topology Ping packets (ICMP protocol’s mandatory ECHO_REQUEST datagram) are sent from host node to target node to elicit ICMP ECHO_RESPONSE.
configuration

file: opnfv_yardstick_tc043.yaml

Packet size 100 bytes. Total test duration 600 seconds. One ping each 10 seconds. SLA RTT is set to maximum 10 ms.

applicability

This test case can be configured with different:

  • packet sizes;
  • burst sizes;
  • ping intervals;
  • test durations;
  • test iterations.

Default values exist.

SLA is optional. The SLA in this test case serves as an example. Considerably lower RTT is expected, and also normal to achieve in balanced L2 environments. However, to cover most configurations, both bare metal and fully virtualized ones, this value should be possible to achieve and acceptable for black box testing. Many real time applications start to suffer badly if the RTT time is higher than this. Some may suffer bad also close to this RTT, while others may not suffer at all. It is a compromise that may have to be tuned for different configuration purposes.

references

Ping

ETSI-NFV-TST001

pre_test conditions Each pod node must have ping included in it.
test sequence description and expected result
step 1 Yardstick is connected with the NFVI node by using ssh. ‘ping_benchmark’ bash script is copyied from Jump Host to the NFVI node via the ssh tunnel.
step 2

Ping is invoked. Ping packets are sent from server node to client node. RTT results are calculated and checked against the SLA. Logs are produced and stored.

Result: Logs are stored.

test verdict Test should not PASS if any RTT is above the optional SLA value, or if there is a test case execution problem.