Manageability Processing Circuit Sideband Channel Power Management
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Solution Overview
Problem
Current computing systems face challenges in power management for semiconductor chips that support remote manageability, leading to increased power consumption and latency due to the need for high-speed I/O communication channels, which require lane training steps and wake-up from idle states, resulting in higher costs and inefficiencies.
Innovation Solution
Implementing a network interface with a packet processing circuit (PPC) and a manageability processing circuit (MPC) that use an always-on power domain and a sideband communication channel for reduced latency and power consumption, allowing for efficient processing of remote manageability packets without waking up clients from low power modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If high-speed I/O communication channels are used for processing remote manageability requests, then processing speed and reliability are improved, but power consumption increases due to lane training steps and wake-up from idle states
Solution Approach 1:
The patent segments the communication interface into two distinct paths: a high-speed I/O communication channel for data-intensive operations and a low-power sideband communication channel for manageability requests. This segmentation allows the system to use the appropriate channel based on the operation type, thereby reducing unnecessary power consumption while maintaining processing speed when needed.
Solution Approach 2:
The patent changes the operational parameters of the communication interface by introducing an always-on low-power mode for the sideband channel. Unlike the high-speed channel that requires lane training and wake-up sequences, the sideband channel operates continuously at low power, changing the power consumption parameter from high to low for manageability traffic while maintaining responsiveness.
2Productivity
If the system wakes up clients from low power modes to process manageability requests, then processing capability is improved, but latency increases due to wake-up time
Solution Approach 1:
The sideband communication channel is preliminarily configured to operate in an always-on state, maintaining processing capability without requiring wake-up sequences. This preliminary action of keeping the channel active eliminates the latency associated with waking up clients from low-power modes while the system remains in its low-power state.
Solution Approach 2:
The sideband communication channel acts as an intermediary for manageability requests, handling these specific traffic types without involving the main high-speed I/O channels or waking up clients. This intermediary path preserves processing capability for manageability functions while avoiding the latency penalty of client wake-up.
3Reliability
If high-speed I/O communication channels are used, then communication reliability is improved, but system cost increases due to cooling requirements
Solution Approach 1:
The patent segments communication traffic into different channels based on power and reliability requirements. The sideband channel handles manageability requests with minimal power consumption, while the high-speed I/O channel handles data-intensive operations. This segmentation reduces overall power dissipation, thereby reducing cooling system requirements and associated costs while maintaining reliability for critical operations.
Solution Approach 2:
The patent applies local quality by providing different communication channel qualities for different traffic types. The sideband channel provides sufficient reliability for manageability requests at low power, while the high-speed channel provides enhanced reliability for data operations. This localized optimization reduces overall system power consumption and cooling requirements compared to using high-speed channels for all traffic.
Data Source
AI summary
An apparatus and method for efficiently performing power management for multiple clients of a semiconductor chip that supports remote manageability. In various implementations, a network interface receives a packet, and sends at least an indication of the packet to a manageability processing circuitry (MPC) of a processing node with multiple clients for processing tasks. The MPC determines whether a client or itself is a destination needed to process the packet. If the destination is the MPC, then packet processing is done by the MPC without involvement from the clients, which can be in an idle state. For example, the MPC can process a remote manageability packet requesting diagnostic information from one or more clients of the processing node. The network interface and the MPC use a sideband communication channel for data transmission, which foregoes lane training for further reduction in latency and power consumption.