@inproceedings{99e5ff8237d94728af4671e6a04dfa0c,
title = "Optimizing latency and CPU load in packet processing systems",
abstract = "High-speed network cards supporting 10 or 40 GbE (Gigabit Ethernet) are available today. Software frameworks for high-speed packet reception and transmission were created to exhaust the performance of these cards. However, these frameworks are not applicable as general-purpose solution. Thus it is necessary to revisit general purpose network 10 software that was designed more than a decade ago. In standard Linux settings, connectivity between applications and physical networks happens via the New API (NAPI). This motivated us to investigate how underlying NIC drivers can be adapted to improve latency in combination with the Linux NAPI. Based on testbed measurements, we propose an optimized algorithm for the NIC driver to dynamically adapt the Interrupt Throttling Rate (ITR). We implemented the algorithm and evaluated it with latency and throughput measurements based on the Linux module of Open vSwitch that operates on top of the NAPI. Our measurements show that our new ITR algorithm improves the packet latency without affecting the CPU load as much as other solutions.",
keywords = "Commodity hardware, ITR, Linux, NAPI, NIC driver, Packet latency, Packet processing",
author = "Paul Emmerich and Daniel Raumer and Alexander Beifu{\ss} and Lukas Erlacher and Florian Wohlfart and Runge, \{Torsten M.\} and Sebastian Gallenm{\"u}ller and Georg Carle",
note = "Publisher Copyright: {\textcopyright} 2015 Society for Modeling \& Simulation International (SCS).; International Symposium on Performance Evaluation of Computer and Telecommunication Systems, SPECTS 2015, Part of the 2015 Summer Simulation Multi-Conference, SummerSim 2015 ; Conference date: 26-07-2015 Through 29-07-2015",
year = "2015",
language = "English",
isbn = "9781510810600",
series = "Simulation Series",
publisher = "The Society for Modeling and Simulation International",
number = "9",
pages = "37--44",
editor = "Franco Davoli and Joel Rodrigues and Imadeldin Mahgoub and Jose Marzo and Malamata Louta and Jose Saldana",
booktitle = "Symposium on Theory of Modeling and Simulation - DEVS Integrative M and S Symposium, DEVS 2015 - 2015 Spring Simulation Multi-Conference, SpringSim 2015",
edition = "9",
}