Measuring Latency within a Networking Device

摘要

Presented herein are techniques to measure latency associated with packets that are processed within a network device. A packet is received at a component of a network device comprising one or more components. A timestamp representing a time of arrival of the packet at a first point in the network device is associated with the packet. The timestamp is generated with respect to a clock of the network device. A latency value for the packet is computed based on at least one of the timestamp and current time of arrival at a second point in the network device. One or more latency statistics are updated based on the latency value.

主权项

1. A method comprising:
receiving a packet at a component of a network device that includes one or more components; generating a signature based on one or more flow parameters associated with the packet; associating the signature with the packet; associating with the packet a timestamp representing a time of arrival of the packet at a first point in the network device; detecting the packet at a second point in the network device based on the signature; computing a latency value for the packet based on at least one of the timestamp and time of arrival at the second point in the network device; and updating one or more latency statistics for the network device based on the latency value.