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MSI protocol

In MSI, each block contained inside a cache can have one of three possible states: These coherency states are maintained through communication between the caches and the backing store. The caches have ...
IEEE

SwiftDir: Secure Cache Coherence without Overprotection

Abstract: Cache coherence states have recently been exploited to leak secrets through timing-channel attacks. The root cause lies in the fact that shared data in state Exclusive (E) and state Shared ...
IEEE

An overview of on-chip cache coherence protocols

Abstract: Cache coherence protocols have significant impact on the performance of distributed and centralized shared-memory of a multiprocessor, and they are required for maintaining data consistency ...
Semiconductor Engineering

CPU Performance Bottlenecks Limit Parallel Processing Speedups

Multi-core processors theoretically can run many threads of code in parallel, but some categories of operation currently bog down attempts to raise overall performance by parallelizing computing. Is ...
Semiconductor Engineering

Balancing Memory And Coherence: Navigating Modern Chip Architectures

In the intricate world of modern chip architectures, the “memory wall” – the limitations posed by external DRAM accesses on performance and power consumption growing slower than the ability to compute ...
Electronic Design

CXL: Coherency, Memory, and I/O Semantics on PCIe Infrastructure

Gain insight into the CXL specification. Learn how CXL supports dynamic multiplexing between a rich set of protocols that includes I/O (CLX.io, based on PCIe), caching (CXL.cache), and memory (CXL.mem ...
Design-Reuse

AMBA 4 ACE for Heterogeneous Multiprocessing SoCs

AMBA 4 ACE adds system-level coherency support to the AMBA 4 specifications. By enabling cache coherency between the high- performance ARM Cortex-A15 MPCore processor and software-compatible high- ...