Cisco Technology, Inc.

Morgan Littlewood

Sundar Iyer

Philip Clifford Jacobs

Nick McKeown

Yifang Zhuang

Many computer processing tasks require large numbers of memory intensive operations to be performed very rapidly. For example, computer network requires that packets be placed into and removed from First-In First-Out (FIFO) queues, numerous counters to be maintained and routing table look-ups to be performed. All of these operations must be performed at very high-speeds in order to keep up with today's high-speed computer network traffic. To help perform these high-speed memory tasks, a high-speed intelligent memory subsystem has been developed. The high-speed intelligent memory subsystem handles the intricacies of these memory operations such that a main process is relieved of some of its duties. Various different high-level memory interfaces for interfacing with the intelligent memory subsystem. The memory interfaces may be hardware-based or software-based. In one embodiment, two layers of interfaces are implemented such that an internal interface may evolve over successive generations without affecting an externally visible interface.

Intelligent memory interface

A method of estimating end-to-end delay performance at an end-to-end delay percentile of interest for a network having two or more network segments includes measuring a delay performance level for each network segment at a corresponding network segment delay percentile and concatenating the measured performance levels by summing to provide an estimate value indicative of end-to-end delay performance. A network segment delay percentile may be selected for each network segment for a particular end-to-end delay percentile of interest, error band, and number of segments. Selection may result in using the same network segment delay percentile for all network segments, or, selecting individual network segment delay percentiles for each network segments, or selecting a first network segment delay percentile for a particular network segment having a largest range of delay relative to the other network segments and selecting a second network segment delay percentile for other segments.

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Los Altos, CA, United States of America

Morgan Littlewood