Method and system for non-tagged based latency calculation

A system for calculating latency comprising:

• a network device comprising:
• a network device engine comprising a queue identified by a queue identifier;
• and
• a latency calculation device configured to:
• receive a first enqueue notification of a first enqueue operation from the network device engine, wherein the first enqueue notification comprises the queue identifier associated with the queue and wherein the first enqueue operation corresponds to a first packet being placed into the queue;
• increment, based on the first enqueue notification, an enqueue counter associated with the queue identifier to obtain a current enqueue counter value;
• determine that a latency calculation flag corresponding to the queue identifier is not set;
• and
• based on the determination that the latency calculation flag is not set:
• determine a first time at which the first enqueue notification of the first enqueue operation was received;
• store the first time as a latency start time associated with the queue identifier;
• store the current enqueue counter value as a latency start count value;
• set the latency calculation flag;
• receive a first dequeue notification of a first dequeue operation from the network device engine, wherein the first dequeue notification comprises the queue identifier associated with the queue and wherein the first dequeue operation corresponds to the first packet being removed from the queue;
• increment, based on the first dequeue notification, a dequeue counter associated with the queue identifier to obtain a first current dequeue counter value;
• determine that the first current dequeue counter value and the latency start count value match;
• determine a second time at which the notification of the first dequeue operation was received;
• store the second time as a latency stop time associated with the queue identifier;
• remove the latency calculation flag;
• and
• calculate a first latency by determining the time difference between the latency start time and the latency stop time.

A non-transitory computer readable medium comprising instructions for calculating latency which, when executed, cause a computer processor to:

• receive, at a latency calculation device, a first enqueue notification of a first enqueue operation from a network device engine, wherein the first enqueue notification comprises a queue identifier associated with a queue and wherein the first enqueue operation corresponds to a first packet being placed into the queue;
• increment, based on the first enqueue notification, an enqueue counter associated with the queue identifier to obtain a current enqueue counter value;
• determine that a latency calculation flag corresponding to the queue identifier is not set;
• and
• based on the determination that the latency calculation flag is not set:
• determine a first time at which the first enqueue notification of the first enqueue operation was received;
• store the first time as a latency start time associated with the queue identifier;
• store the current enqueue counter value as a latency start count value;
• set the latency calculation flag;
• receive a first dequeue notification of a first dequeue operation from the network device engine, wherein the first dequeue notification comprises the queue identifier associated with the queue and wherein the first dequeue operation corresponds to the first packet being removed from the queue;
• increment, based on the first dequeue notification, a dequeue counter associated with the queue identifier to obtain a first current dequeue counter value;
• determine that the first current dequeue counter value and the latency start count value match;
• determine a second time at which the notification of the first dequeue operation was received;
• store the second time as a latency stop time associated with the queue identifier;
• remove the latency calculation flag;
• and
• calculate a first latency by determining the time difference between the latency start time and the latency stop time.