Why PCIe Performance Falls Short of Its Bandwidth Limits—and How to Optimize It

This article reviews the key factors that prevent PCIe links from reaching their theoretical bandwidth, including data encoding overhead, link‑layer and physical‑layer packet structures, and payload‑size settings such as MPS and MRRS, and explains how each impacts real‑world performance.

Data EncodingLink LayerMPS

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Why PCIe Performance Falls Short of Its Bandwidth Limits—and How to Optimize It

Architects' Tech Alliance

Jul 7, 2023 · Fundamentals

Factors Affecting PCIe Link Performance: Encoding, Link Layer, MPS, and MRRS

This article reviews the key factors that influence PCIe link performance—including data encoding schemes, link‑layer and physical‑layer overhead, and the configuration of Maximum Payload Size (MPS) and Maximum Read Request Size (MRRS)—and explains how each impacts real‑world throughput.

Data EncodingLink LayerMPS

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Factors Affecting PCIe Link Performance: Encoding, Link Layer, MPS, and MRRS