Interconnect Control Node Dynamic Response Routing
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Solution Overview
Problem
Modern interconnects face challenges in efficiently utilizing available bandwidth and reducing latency due to the significant volume of traffic passing between nodes, which affects the performance of systems that incorporate them.
Innovation Solution
The interconnect system includes a plurality of nodes with a routing network, comprising slave nodes, master nodes, and control nodes, where control nodes respond to slave node requests, issue control node requests to chosen master nodes, and send update destination requests to alter the destination for master node responses, allowing for direct routing to replacement destination nodes, thereby reducing latency and improving bandwidth utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If requests are routed through control nodes to service slave node requests, then request servicing capability is improved, but latency increases due to additional routing hops
Solution Approach 1:
The system performs preliminary actions by having control nodes issue update destination requests to master nodes before the master node response is generated. This allows the master node to pre-configure the response routing path, so that when the response is ready, it can be sent directly to the replacement destination node without additional routing delays through the control node.
Solution Approach 2:
The control node acts as an intermediary that facilitates direct routing between master nodes and replacement destination nodes. By issuing update destination requests, the control node enables the master node to bypass the control node in the response path, effectively using the control node as a mediator that sets up direct communication channels rather than being part of the actual data transmission path.
2Loss of time
If direct routing of master node responses to replacement destination nodes is implemented, then latency is reduced, but device complexity increases due to additional routing control mechanisms
Solution Approach 1:
The control node performs multiple functions: it services slave node requests, issues update destination requests to modify response routing, and coordinates with master nodes. The master node also performs multiple functions: processing control node requests, generating responses, and routing responses to either the control node or replacement destination nodes based on received update requests. This multi-functionality reduces the need for separate dedicated components.
Solution Approach 2:
The routing path for master node responses is made dynamic rather than static. The destination of the response can change based on trigger events that occur during request processing. The system dynamically adjusts the response destination from the default control node to a replacement destination node when appropriate, allowing flexibility in routing without requiring complex permanent infrastructure.
3Productivity
If control nodes issue update destination requests to alter response routing, then bandwidth utilization is improved, but the complexity of node operations increases
Solution Approach 1:
The control node issues update destination requests as a preliminary action during request processing, before the master node generates its response. This timing allows the routing path to be established in advance, enabling better bandwidth utilization by preparing the data flow path early in the transaction rather than waiting until response generation time.
Data Source
AI summary
An interconnect, and method of operation of such an interconnect, are disclosed. The interconnect has a plurality of nodes, and a routing network via which information is routed between the plurality of nodes. The plurality of nodes comprises at least one slave node used to couple master devices to the interconnect, at least one master node used to couple slave devices to the interconnect, and at least one control node. Each control node is responsive to a slave node request received via the routing network from a slave node, to perform an operation to service the slave node request and, when a propagation condition is present, to issue a control node request via the routing network to a chosen master node in order to service the slave node request. The chosen master node processes the control node request in order to generate a master node response, and treats as a default destination for the master node response the control node that issued the control node request. In response to a trigger event occurring after the control node request has been issued, the control node sends an update destination request to the chosen master node that identifies a replacement destination node for the master node response. At least in the absence of an override condition, the chosen master node then sends the master node response via the routing network to the replacement destination node.