Buffer Assignment Balancing in Network Devices
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Solution Overview
Problem
Current network devices face challenges in optimally balancing operations across buffers, leading to issues like buffer skew and delayed propagation of buffer state information, due to outdated or delayed buffer utilization metrics.
Innovation Solution
The implementation of a modified prioritized list of buffers using re-ordering logic that randomly or pseudo-randomly adjusts the positions of buffer sets, reducing buffer skew and optimizing buffer utilization by prioritizing emptier buffers for writing operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional buffer assignment methods are used, then buffer management is simple, but buffer utilization becomes unbalanced leading to buffer skew
Solution Approach 1:
The patent implements dynamic buffer assignment by continuously reordering the prioritized buffer list based on real-time buffer state information. Instead of using a static assignment method, the system dynamically adjusts buffer priorities to prevent buffer skew, ensuring that buffers are selected for packet writing based on current utilization metrics rather than fixed positions.
Solution Approach 2:
The system employs feedback mechanisms by monitoring buffer state information and using this information to reorder the prioritized buffer list. The buffer state information feeds back into the buffer assignment logic, creating a closed-loop system that continuously optimizes buffer utilization and prevents buffer skew by adjusting assignments based on actual buffer conditions.
2Device complexity
If buffer state information propagation is delayed, then system complexity is reduced, but buffer assignment accuracy deteriorates
Solution Approach 1:
The patent applies preliminary action by reordering the prioritized buffer list in advance based on available buffer state information, even if that information is slightly delayed. The system proactively adjusts buffer priorities before packet assignment occurs, ensuring that the most up-to-date buffer state information is utilized to make informed assignment decisions rather than waiting for perfectly synchronized data.
3Reliability
If more buffers are allocated, then packet drops due to buffer overruns are reduced, but device resource requirements increase
Solution Approach 1:
The patent changes the parameter of buffer assignment strategy from static to dynamic reordering based on buffer state. By altering how buffers are selected and prioritized rather than simply increasing buffer quantity, the system achieves better packet delivery reliability through optimized buffer utilization, preventing the need to allocate additional buffer memory resources.
Data Source
AI summary
Techniques for more optimally balancing operations across a set of buffers, such as in buffering packets in a network device or in other contexts, are disclosed. The techniques make use of an ordered list of buffers from which the next available buffer is selected for each operation, as needed. The buffers are first prioritized based on the state(s) of the relevant buffers and/or other factors. The resulting ordered list is then processed using re-ordering logic. This re-ordering logic may, for example, randomly or pseudo-randomly trade the positions of various sets of buffers within the prioritized list. Among other effects, the re-ordering logic thus reduces buffer skew problems from delayed propagation of buffer state information and other issues. In an embodiment, the re-ordering logic is divided into multiple levels of processing, with each level separately passing through the list. Each level of processing may utilize differently configured re-ordering logic.