Memory Controller Near Memory Reservation for QoS
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Solution Overview
Problem
In datacenter cloud environments, memory-intensive applications can over-utilize near memory, leading to reduced performance for high-priority applications and inconsistent quality of service (QoS), as 'noisy neighbor' applications consume shared resources, causing other applications to access data more slowly and increasing time-to-completion of data processing operations.
Innovation Solution
Implementing a memory reservation system where a memory controller allocates exclusive regions of near memory based on priority and latency sensitivity, allowing processes to reserve specific amounts of memory, preventing eviction and isolating noisy neighbors, thereby ensuring consistent performance and QoS across applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If memory is allocated on a first-come first-served basis to applications, then memory utilization is maximized, but performance consistency and quality of service cannot be guaranteed for high-priority applications
Solution Approach 1:
The memory system is segmented into reserved regions and non-reserved regions. Reserved regions are allocated to specific applications or tenants with guaranteed access, while non-reserved regions follow first-come first-served allocation. This segmentation allows simultaneous maximization of overall memory utilization while guaranteeing quality of service for priority applications.
Solution Approach 2:
Memory regions are pre-reserved for specific applications before they need the memory resources. The memory controller is configured in advance to allocate specific portions of near memory to particular applications, ensuring that when these applications need memory, guaranteed capacity is immediately available without contention from other applications.
2Productivity
If shared memory resources are used to provide performance scalability, then throughput is improved, but noisy neighbor applications can over-utilize memory and limit utilization by other applications
Solution Approach 1:
The shared memory resources are divided into reserved regions (isolated from noisy neighbors) and non-reserved regions (shared for throughput). Applications that are prone to noisy neighbor behavior are prevented from accessing reserved regions, while still allowing them to utilize non-reserved regions for scalable throughput when memory is available.
Solution Approach 2:
The memory controller acts as an intermediary between applications and memory resources. It enforces access policies that prevent noisy neighbor applications from over-utilizing memory by blocking their access to reserved regions while allowing legitimate access to non-reserved regions, thus mediating between throughput needs and resource protection.
3Quantity of substance
If near memory is allocated to low-priority applications, then memory capacity is fully utilized, but high-priority applications experience slower access times
Solution Approach 1:
Near memory is segmented into reserved regions with guaranteed access for high-priority applications and non-reserved regions for shared allocation. The memory controller is configured to give priority access to reserved regions, ensuring that high-priority applications maintain fast access times while low-priority applications can utilize available capacity in non-reserved regions.
Solution Approach 2:
Different regions of near memory are assigned different access qualities. Reserved regions provide guaranteed fast access for high-priority applications, while non-reserved regions provide best-effort access for other applications. This local differentiation of memory quality allows simultaneous optimization for both speed and capacity utilization.
Data Source
AI summary
Examples described herein relate to a memory controller, when connected to at least one memory device in a multi-tiered memory system comprising a near memory and far memory, is to allocate a region of the near memory to a requester based on receipt of a request. In some examples, the memory controller includes circuitry to transmit at least one memory read command and address information to the multi-tiered memory system to read data from the multi-tiered memory system and circuitry to transmit at least one memory write command and address information to the multi-tiered memory system to write data to the multi-tiered memory system, wherein the near memory comprises at least one memory connected to the memory controller via a memory interface and the far memory comprises at least one memory connected to the memory controller via a network.