RAM Label Cluster Chain Management for Multicast
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Solution Overview
Problem
Existing methods for managing label chains in random access memory face challenges in efficiently adding and removing labels while maintaining memory usage efficiency and ensuring no gaps or duplicates, which is crucial for multicast packet processing and VPLS operations.
Innovation Solution
A method involving establishing a fixed-size cluster of labels with a sentinel cluster, a root table for replication management, and a chain structure where each full cluster points to the next, allowing for efficient addition and removal of labels by creating new clusters and updating pointers, ensuring minimal memory usage and proper handling of in-flight references.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If labels are stored in consecutive address locations in label memory, then memory access efficiency is improved, but memory usage efficiency deteriorates when labels are removed creating gaps
Solution Approach 1:
The label chain is segmented into fixed-size label clusters (e.g., 4 labels per cluster). Each cluster is a discrete unit that can be independently managed. When labels are removed, entire clusters can be returned to the free pool rather than creating gaps within clusters, maintaining both consecutive storage efficiency and memory reuse efficiency.
Solution Approach 2:
The implementation changes the granularity of memory management from individual labels to fixed-size clusters. This parameter change allows the system to maintain consecutive address locations within clusters while efficiently reusing memory by returning complete clusters to the free pool when labels are removed.
2Productivity
If a fixed-size cluster structure is implemented, then memory management efficiency is improved, but device complexity increases due to cluster and chain management
Solution Approach 1:
The system implements self-service through automatic cluster allocation and chain management. When labels are added or removed, the software automatically handles cluster allocation, chain linking, and free pool management without manual intervention. The fixed-size cluster structure enables automatic tracking of cluster boundaries and chain relationships.
Solution Approach 2:
The label cluster structure serves multiple functions: it provides fixed-size memory allocation for efficient access, acts as a manageable unit for addition and removal operations, maintains chain relationships through linking, and enables bulk return to free pool. This multi-functionality reduces the need for separate management mechanisms.
3Adaptability or versatility
If labels are removed from the middle of a label chain, then flexibility is improved, but maintaining no gaps or duplicates becomes more difficult
Solution Approach 1:
When a label needs to be removed from the middle of a chain, the implementation extracts the entire cluster containing that label and returns it to the free pool. This extraction approach eliminates the complexity of maintaining consecutive labels while preserving the no-gaps constraint, as the remaining labels in the chain simply point to the next valid cluster.
Solution Approach 2:
The system performs preliminary validation before label removal operations to ensure the label exists in the chain and to identify its cluster. This preliminary action prevents duplicate removals and ensures proper chain maintenance. The fixed-size cluster structure makes this validation straightforward by checking cluster boundaries and validity bits.
Data Source
AI summary
According to an example embodiment, a technique may be provided for managing a label data base of which each entry comprises a data field for insertion into a respective packet in a multicast transmission and a validity field. The technique may include, for example, (a) establishing a fixed size for a cluster of labels, (b) associating with each cluster a pointer to another cluster, (c) establishing a sentinel cluster of which all entries are indicated to be invalid and of which the cluster pointer points to this sentinel cluster, (d) establishing a root table which defines the number of replications of the packet in a multicast group and identifies a first label cluster associated with the multicast group and (e) establishing a chain of clusters of which each cluster which is full of valid entries points to the next cluster in the chain and the last cluster which contains valid entries points to the sentinel cluster.