Searcharxiv⌕ Search
Home/Archive/arXiv

arXiv · 2610.36436

USB Differentiated Service for Networked Cyber-Physical Systems

Anton Njavro·Rafiuddin Syed·Shriram Raja·Zhiyuan Ruan·Richard West
View original source ↗Read source document ↗Export metadata ↓

Abstract

Cyber-physical systems are increasingly complex, requiring high throughput, low-latency data processing across multiple cores and compute devices. Additional functional safety challenges dictate the need for high system availability in the presence of failures. Together, these requirements are addressed using a network of compute nodes across which data processing, control and functional safety tasks are distributed. A key challenge is how to address the service requirements of independent data flows, spanning a set of hosts and I/O devices. In this paper, we show how to develop connectivity between hosts using a custom xDCI gadget driver that uses USB interrupters to differentiate the processing of separate data flows. Our solution is the first to handle both isochronous and bulk communication at USB 3.0 transfer rates, with predictable bus latencies down to the granularity of a 125 microsecond microframe, which is sufficient for many CPS control operations. We present an end-to-end solution that couples the predictable execution of user-level tasks with interrupt processing and data communication, so that multiple virtual connections are able to share a common bus. This work is not only applicable to host networking but also device I/O, which makes it arguably desirable for CPS scenarios requiring short-range communication, such as in vehicle control area networks or robotics.

Explore related subjects

cs.OS

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

Anton Njavro, Rafiuddin Syed, Shriram Raja, Zhiyuan Ruan, Richard West. 2026-10-27. USB Differentiated Service for Networked Cyber-Physical Systems. https://arxiv.org/abs/2610.36436

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related papers

arXiv2026

Callosal: Rethinking the Kernel Page Cache for Disaggregated Storage and Memory

Classic distributed filesystems like NFS centralize filesystem operations on a server and use custom, filesystem-specific approaches for managing cache consistency across client nodes. This limits scalability, and it leads to weak consistency, ruling out applications that concurrently access and mutate shared files. Our key insight is that these legacy designs are now too storage-centric; with today's large memories, OS page caches do most of the "heavy lifting" in accessing data, not the filesystem and block storage layers. In response to this, we present Callosal, a page cache for a cluster of machines that is centered on shared disaggregated memory. Rather than serializing operations through a filesystem server and using ad hoc caching like NFS, Callosal is built around the existing Linux page cache paths and is accelerated by RDMA and programmable switches. Callosal delivers the strong consistency that programs expect with local filesystems (like in ext4 and tmpfs) while avoiding the additional network access delays and bottlenecks that host-based solutions incur. We compare Callosal against NFS, CephFS, and local filesystems; often Callosal can provide caching performance similar to local filesystems while also scaling across nodes. For mixed read/write workloads, on average Callosal has 4.6x higher throughput than NFS when contention is not extreme, and it offers strong consistency guarantees like CephFS, while outperforming it. For a file-backed key-value store with 1% writes and uniform access, Callosal scales 1.7x across 4 nodes, while CephFS collapses across nodes.

cs.OS↗
arXiv2026

safeL4: Rethinking Safe-Language-Based Single Address Space Microkernels

Microkernels provide good features such as high security, safety, and flexibility, but their reliance on hardware-based isolation leads to heavy performance overhead, limiting their widespread adoption. Although constructing single-address-space microkernels based on safe language-based isolation is a promising approach to addressing the performance issue, this approach still faces challenges in maintaining the principle of minimality and enforcing capability-based, fine-grained access control over system resources. We propose safeL4, an approach to constructing microkernels based on safe languages. It guarantees minimality through low-level abstractions for unsafe operations, and implements a capability system based on the safe language's object capabilities to achieve fine-grained access control over all operations on system resources. We implement a prototype system in Rust, and our evaluation results show that the primitives provided by safeL4 are, on average, 1.9$\times$ faster than those of seL4.

cs.OS↗
arXiv2026

Breaking the Coupling: Efficient Concurrency Fuzzing for Linux Kernel Data Race Detection

Detecting data races in the Linux kernel requires exploring both the input space and the thread-interleaving space. Existing kernel concurrency fuzzers couple these two searches by exploring interleavings during fuzzing, often spending substantial scheduling effort on inputs with little potential to trigger real races. In this paper, we present a new concurrency fuzzing paradigm that decouples concurrent-input generation from thread-interleaving exploration, enabling expensive scheduling to focus on promising inputs. To identify inputs that warrant targeted scheduling, we introduce May Race Pairs (MRPs), which represent conflicting memory-access pairs observed within a dynamically determined time threshold. Our framework first generates and executes concurrent syscall groups without controlled scheduling, collecting MRPs to guide further input mutation and identify schedule-worthy inputs. It then uses a separate scheduling instance to explore targeted interleavings and confirm real data races. To improve the effectiveness of both stages, we incorporate LLM-assisted semantic mutation for generating diverse syscall groups, backpressure-guided dynamic threshold control for balancing candidate production and scheduling consumption, and history-aware context recovery, context-aware interleaving scheduling, and candidate MRP prioritization for efficient race confirmation. We implement our framework for the Linux kernel and evaluate it on eight common kernel modules in Linux 6.17. It discovers 187 unique real-world data races, including 59 harmful races. Under the same testing budget, our approach detects substantially more data races than existing kernel concurrency fuzzers, including SegFuzz and CONZZER. These results demonstrate the effectiveness of decoupling concurrent-input generation from interleaving exploration and concentrating scheduling effort on promising candidates.

cs.OS↗