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Multimachine stability analysis is crucial for understanding the dynamics and stability of power systems with multiple synchronous machines. The objective is to solve the swing equations for a network of M machines connected to an N-bus power system.
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Beams are structural elements commonly employed in engineering applications requiring different load-carrying capacities. The first step in analyzing a beam under a distributed load is to simplify the problem by dividing the load into smaller regions, which allows one to consider each region separately and calculate the magnitude of the equivalent resultant load acting on each portion of the beam. The magnitude of the equivalent resultant load for each region can be determined by calculating...
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Aluminum has become the material of choice for overhead transmission lines, surpassing copper due to its abundance and cost-effectiveness. The most prevalent type is the aluminum conductor, steel-reinforced (ACSR), which combines aluminum strands around a steel core. Other variants include all-aluminum conductors (AAC), all-aluminum alloy conductors (AAAC), aluminum conductor alloy-reinforced (ACAR), and aluminum-clad steel conductors. Advanced designs, such as aluminum conductors with steel...
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Numerous practical applications within engineering disciplines, such as telecommunications, necessitate optimizing power delivery to a connected load. This pursuit, however, entails inherent internal losses, which can either equal or exceed the power supplied to the load. The Thevenin equivalent circuit is helpful in finding the maximum power a linear circuit can deliver to a load. It is assumed in this context that the load resistance can be adjusted.
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The analysis of suspension bridges is a complex and critical process that involves multiple factors, including the shape and tension of the main cables. The main cables of suspension bridges are subjected to distributed loads, which result in changes in tensile forces and deformation of the cable. These loads must be carefully considered to ensure that the bridge is safe and capable of supporting the weight of different loads.
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Related Experiment Video

Updated: Jul 26, 2025

Quasi-light Storage for Optical Data Packets
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Overcoming the IOTLB wall for multi-100-Gbps Linux-based networking.

Alireza Farshin1, Luigi Rizzo2, Khaled Elmeleegy2

  • 1School of Electrical Engineering and Computer Science, KTH Royal Institute of Technology, Kista, Sweden.

Peerj. Computer Science
|June 22, 2023
PubMed
Summary
This summary is machine-generated.

This study addresses the performance impact of IOMMU on high-speed networks. Using hugepage-backed buffers in the Linux kernel effectively eliminates throughput drops caused by IOMMU misses.

Keywords:
200 GbpsHugepagesIOMMUIOTLBLinux kernelPacket processingiPerf

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Area of Science:

  • Computer Science
  • Systems Engineering
  • Network Performance

Background:

  • High-speed networking (200 Gbps) faces performance degradation due to Input/Output Memory Management Unit (IOMMU) overhead.
  • IOMMU Translation Lookaside Buffer (IOTLB) misses significantly impact throughput, causing drops up to 20% on modern Intel Xeon & AMD EPYC processors.

Purpose of the Study:

  • To investigate and mitigate the performance penalties associated with IOMMU in high-speed network traffic within the Linux kernel.
  • To analyze IOTLB behavior and identify factors contributing to performance bottlenecks.

Main Methods:

  • Characterization of IOTLB behavior and its performance impact on Intel Xeon Scalable and AMD EPYC platforms at 200 Gbps.
  • Development and evaluation of a hugepage-aware memory allocator for Linux network device drivers.
  • Analysis of mitigation strategies, focusing on the use of hugepage IOTLB entries.

Main Results:

  • Identified key factors contributing to IOTLB misses and throughput reduction.
  • Demonstrated that hugepage-backed buffers completely recover throughput lost due to IOMMU.
  • Formulated guidelines to help developers avoid the 'IOTLB wall'.

Conclusions:

  • Hugepage-backed buffers are an effective solution to overcome IOMMU-induced performance limitations in high-speed networking.
  • Rethinking I/O management in the Linux kernel is crucial for supporting higher data rates effectively.