Cache Agent Load Balancing via Dynamic Memory Address Redistribution

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Solution Overview

Problem

In server platforms, memory-intensive and I/O-intensive workloads can overload Caching and Home Agent (CHA) resources, leading to performance degradation and potential system malfunctions, as a single CHA handles excessive memory and I/O requests, causing bottlenecks and failure to meet service level agreements.

Innovation Solution

Implementing a load balancing mechanism that monitors CHA loads dynamically and reallocates memory address ranges from heavily loaded CHAs to lightly loaded ones by using a pre-reserved memory swap partition, ensuring balanced workload distribution and preventing performance bottlenecks.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a single CHA handles all memory and I/O requests, then the system structure is simple, but the CHA becomes overloaded leading to performance degradation

Engineering Contradiction:

ImproveCHA structureVSAvoidCHA processing capacity

Core Design Contradiction:

Device complexityVSProductivity

Solution Approach 1:

The patent divides the memory address space into multiple segments, each handled by a different CHA. Instead of having one CHA manage all addresses, the system segments the address space and distributes management responsibilities across multiple CHAs, preventing any single CHA from becoming overloaded while maintaining manageable complexity through structured division

Inventive Principle:

Principle #1Segmentation

2Ease of manufacture

If memory address ranges are fixed to specific CHAs, then allocation is simple, but load distribution becomes unbalanced causing bottlenecks

Engineering Contradiction:

ImproveAddress range allocationVSAvoidService level agreement compliance

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent implements dynamic address range allocation where CHAs can acquire and release memory address ranges based on their current workload. When a CHA becomes overloaded, it can release some address ranges to other CHAs; when underloaded, it can acquire additional ranges. This dynamic adjustment maintains balanced load distribution while ensuring service level agreements are met

Inventive Principle:

Principle #15Dynamics

3Ease of operation

If workload is statically allocated to CHAs, then system operation is simple, but performance degrades under varying workload conditions

Engineering Contradiction:

ImproveCHA workload managementVSAvoidSystem performance

Core Design Contradiction:

Ease of operationVSProductivity

Solution Approach 1:

The patent implements a feedback mechanism where CHAs continuously monitor their own workload and dynamically adjust their address range allocations accordingly. Each CHA provides feedback about its load status, and based on this feedback, the system redistributes address ranges to maintain optimal performance under varying workload conditions while keeping operation simple through automated responses

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS20230070411A1Load-balancer for cache agent

Publication Date: 2023.03.09 INTEL CORP

AI summary

Examples described herein relate to a central processing unit (CPU) that includes at least two cores, at least two caching agents (CAs), and circuitry to monitor a workload mapped to a CA of the at least two CAs and adjust the workload allocated to the CA to allocation among the CA and at least one other CA of the at least two CAs based on the monitored workload.