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Latency (engineering)

About: Latency (engineering) is a research topic. Over the lifetime, 7278 publications have been published within this topic receiving 115409 citations. The topic is also known as: lag.


Papers
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Journal ArticleDOI
TL;DR: ix is presented, a dataplane operating system that provides high I/O performance and high resource efficiency while maintaining the protection and isolation benefits of existing kernels.
Abstract: The conventional wisdom is that aggressive networking requirements, such as high packet rates for small messages and μs-scale tail latency, are best addressed outside the kernel, in a user-level networking stack. We present ix, a dataplane operating system that provides high I/O performance and high resource efficiency while maintaining the protection and isolation benefits of existing kernels. ix uses hardware virtualization to separate management and scheduling functions of the kernel (control plane) from network processing (dataplane). The dataplane architecture builds upon a native, zero-copy API and optimizes for both bandwidth and latency by dedicating hardware threads and networking queues to dataplane instances, processing bounded batches of packets to completion, and eliminating coherence traffic and multicore synchronization. The control plane dynamically adjusts core allocations and voltage/frequency settings to meet service-level objectives. We demonstrate that ix outperforms Linux and a user-space network stack significantly in both throughput and end-to-end latency. Moreover, ix improves the throughput of a widely deployed, key-value store by up to 6.4× and reduces tail latency by more than 2× . With three varying load patterns, the control plane saves 46%--54% of processor energy, and it allows background jobs to run at 35%--47% of their standalone throughput.

52 citations

Journal ArticleDOI
TL;DR: In this paper, the effects of different levels of delay (or latency) on the coordination, pace and timing regularity of musicians who are in remote locations were investigated, where two pairs of musicians performed Mozart duets while isolated visually and connected through microphones and headphones.
Abstract: We investigate the effects of different levels of delay (or latency) on the coordination, pace and timing regularity of musicians who are in remote locations—a situation encountered in an interactive network performance. Two pairs of musicians performed two Mozart duets while isolated visually and connected through microphones and headphones. Different levels of latency (0, 20, 40, 50, 80, 100, 120, 150, and 200 ms) were introduced into the performing environment (musicians heard themselves in real time and only the other part delayed); the musicians performed the duets under these conditions and rated their musicality and level of interactivity. Although the musicians chose different strategies to handle the latency, which resulted in different levels of success in maintaining coordination, pacing and regularity, both duets were strongly affected by latency at and above 100 ms. At these levels, the musicians rated the performances as neither musical nor interactive, and they reported that they played as individuals and listened less and less to one another.

52 citations

01 Oct 2007
TL;DR: This document adapts the protocol for IPv4 networks to improve performance over Mobile IPv4 operations, including processing of Agent Advertisements, new Care of Address acquisition and Registration Request and Reply, and reduces the IP address configuration.
Abstract: This document adapts the Mobile IPv6 Fast Handovers to improve delay and packet loss resulting from Mobile IPv4 handover operations. Specifically, this document addresses movement detection, IP address configuration, and location update latencies during a handover. For reducing the IP address configuration latency, the document proposes that the new Care-of Address is always made to be the new access router's IP address. This memo defines an Experimental Protocol for the Internet community.

52 citations

Proceedings Article
11 Dec 1989
TL;DR: This paper presents some encouraging preliminary results of a project to determine how much restructuring is possible with automatic techniques to reduce the latency of memory in basic machine cycles.
Abstract: Because computation speed and memory size are both increasing, the latency of memory, in basic machine cycles, is also increasing. As a result, recent compiler research has focused on reducing the e ective latency by restructuring programs to take more advantage of high-speed intermediate memory (or cache, as it is usually called). The problem is that many real-world programs are non-trivial to restructure, and current methods will often fail. In this paper, we present some encouraging preliminary results of a project to determine how much restructuring is possible with automatic techniques.

51 citations

Proceedings ArticleDOI
30 Aug 2010
TL;DR: A new scalable architecture called reference latency interpolation (RLI) is proposed that is based on the observation that packets potentially belonging to different flows that are closely spaced to each other exhibit similar delay properties and achieves a median relative error of 12% and one to two orders of magnitude higher accuracy.
Abstract: New applications such as algorithmic trading and high-performance computing require extremely low latency (in microseconds). Network operators today lack sufficient fine-grain measurement tools to detect, localize and repair performance anomalies and delay spikes that cause application SLA violations. A recently proposed solution called LDA provides a scalable way to obtain latency, but only provides aggregate measurements. However, debugging application-specific problems requires per-flow measurements, since different flows may exhibit significantly different characteristics even when they are traversing the same link. To enable fine-grained per-flow measurements in routers, we propose a new scalable architecture called reference latency interpolation (RLI) that is based on our observation that packets potentially belonging to different flows that are closely spaced to each other exhibit similar delay properties. In our evaluation using simulations over real traces, we show that RLI achieves a median relative error of 12% and one to two orders of magnitude higher accuracy than previous per-flow measurement solutions with small overhead.

51 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20222
2021485
2020529
2019533
2018500
2017405