High-Resolution Timer-Based Packet Pacing Mechanism on the Linux Operating System
| Autor: | Yuetsu Kodama, Ryousei Takano, Tomohiro Kudoh, Fumihiro Okazaki |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
Computer Networks and Communications
business.industry Computer science Network packet ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS Real-time computing computer.software_genre Watchdog timer Transmission (telecommunications) Large segment offload Gigabit Burstiness Operating system Timer Electrical and Electronic Engineering Interrupt business Communications protocol computer Software Computer network TCP pacing |
| Zdroj: | IEICE Transactions on Communications. :2199-2207 |
| ISSN: | 1745-1345 0916-8516 |
| DOI: | 10.1587/transcom.e94.b.2199 |
| Popis: | Packet pacing is a well-known technique for reducing the short-time-scale burstiness of traffic, and software-based packet pacing has been categorized into two approaches: the timer interrupt-based approach and the gap packet-based approach. The former was originally hard to implement for Gigabit class networks because it requires the operating system to handle too frequent periodic timer interrupts, thus incurring a large overhead. On the other hand, a gap packet-based packet pacing mechanism achieves precise pacing without depending on the timer resolution. However, in order to guarantee the accuracy of rate control, the system must be able to transmit packets at the wire rate. In this paper, we propose a high-resolution timer-based packet pacing mechanism that determines the transmission timing of packets by using a sub-microsecond resolution timer. The high-resolution timer is a light-weight mechanism compared to the traditional low-resolution periodic timer. With recent progress in hardware protocol offload technologies and multicore-aware network protocol stacks, we believe high-resolution timer-based packet pacing has become practical. Our experimental results show that the proposed mechanism can work on a wider range of systems without degrading the accuracy of rate control. However, a higher CPU load is observed when the number of traffic classes increases, compared to a gap packet-based pacing mechanism. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|