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Operating System Noise in the Linux Kernel
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DOI：10.1109/TC.2022.3187351.png)
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Abstract
En 中文
As modern network infrastructure moves from hardware-based to software-based using Network Function Virtualization, a new set of requirements is raised for operating system developers. By using the real-time kernel options and advanced CPU isolation features common to the HPC use-cases, Linux is becoming a central building block for this new architecture that aims to enable a new set of low latency networked services. Tuning Linux for these applications is not an easy task, as it requires a deep understanding of the Linux execution model and the mix of user-space tooling and tracing features. This paper discusses the internal aspects of Linux that influence the Operating System Noise from a timing perspective. It also presents Linux's osnoise tracer, an in-kernel tracer that enables the measurement of the Operating System Noise as observed by a workload, and the tracing of the sources of the noise, in an integrated manner, facilitating the analysis and debugging of the system. Finally, this paper presents a series of experiments demonstrating both Linux's ability to deliver low OS noise (in the single-digit $\mu$mu s order), and the ability of the proposed tool to provide precise information about root-cause of timing-related OS noise problems.
Keywords:
Linux kernel
operating system noise
high-performance computing
soft real-time systems
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3.8
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5.3K
Citations:
9.8K
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