@inproceedings{a3ec87049b1f4815b410bec7c9092e0d,
title = "Optimizing latency and CPU load in packet processing systems",
abstract = "High-speed network cards supporting 10 or 40GbE (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 IO 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 = "ITR, Linux, NAPI, NIC driver, commodity hardware, packet latency, packet processing",
author = "Paul Emmerich and Daniel Raumer and Alexander Beifuss and Lukas Erlacher and Florian Wohlfart and Runge, {Torsten M.} and Sebastian Gallenmuller and Georg Carle",
note = "Publisher Copyright: {\textcopyright} 2015 Society for Modeling and Simulation International.; 2015 International Symposium on Performance Evaluation of Computer and Telecommunication Systems, SPECTS 2015 ; Conference date: 26-07-2015 Through 29-07-2015",
year = "2015",
month = sep,
day = "30",
doi = "10.1109/SPECTS.2015.7285275",
language = "English",
series = "Proceedings of the 2015 International Symposium on Performance Evaluation of Computer and Telecommunication Systems, SPECTS 2015 - Part of SummerSim 2015 Multiconference",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
editor = "Franco Davoli and Malamati Louta and Imadeldin Mahgoub and Jose Saldana and Obaidat, {Mohammad S.} and Marzo, {Jose L} and Joel Rodrigues",
booktitle = "Proceedings of the 2015 International Symposium on Performance Evaluation of Computer and Telecommunication Systems, SPECTS 2015 - Part of SummerSim 2015 Multiconference",
}