TY - JOUR
T1 - Implementation and experimental performance evaluation of a hybrid interrupt-handling scheme
AU - Salah, K.
AU - Qahtan, A.
N1 - Funding Information:
We acknowledge the support of King Fahd University of Petroleum and Minerals in completion of this work. This work has been funded under Project #INT-383. We are also very thankful to Robert Olsson and Jamal Salim Hadi for their valuable replies and comments to some of the issues faced throughout this work.
PY - 2009/1/23
Y1 - 2009/1/23
N2 - The performance of network hosts can be severely degraded when subjected to heavy traffic of today's Gigabit networks. This degradation occurs as a result of the interrupt overhead associated with the high rate of packet arrivals. NAPI, a packet reception mechanism integrated into the latest version of Linux networking subsystem, was designed to improve Linux performance to suit today's Gigabit traffic. NAPI is definitely a major step up from earlier reception mechanisms; however, NAPI has shortcomings and its performance can be further enhanced. A hybrid interrupt-handling scheme, which was recently proposed in Salah et al. [K. Salah, K. El-Badawi, F. Haidari, Performance Analysis and Comparison of Interrupt-Handling Schemes in Gigabit Networks, International Journal of Computer Communications, Elsevier, Amsterdam 30 (17) (2007) 3425-3441], can better improve the performance of Gigabit network hosts. The hybrid scheme switches between interrupt disabling-enabling (DE) and polling (NAPI). In this paper, we present and discuss major changes required to implement such a hybrid scheme in the latest version of Linux kernel 2.6.15. We prove experimentally that the hybrid scheme can significantly improve the performance of general-purpose network desktops or servers running network I/O-bound applications, when subjecting such network hosts to both light and heavy traffic load conditions. The performance is measured and analyzed in terms of throughput, packet loss, latency, and CPU availability.
AB - The performance of network hosts can be severely degraded when subjected to heavy traffic of today's Gigabit networks. This degradation occurs as a result of the interrupt overhead associated with the high rate of packet arrivals. NAPI, a packet reception mechanism integrated into the latest version of Linux networking subsystem, was designed to improve Linux performance to suit today's Gigabit traffic. NAPI is definitely a major step up from earlier reception mechanisms; however, NAPI has shortcomings and its performance can be further enhanced. A hybrid interrupt-handling scheme, which was recently proposed in Salah et al. [K. Salah, K. El-Badawi, F. Haidari, Performance Analysis and Comparison of Interrupt-Handling Schemes in Gigabit Networks, International Journal of Computer Communications, Elsevier, Amsterdam 30 (17) (2007) 3425-3441], can better improve the performance of Gigabit network hosts. The hybrid scheme switches between interrupt disabling-enabling (DE) and polling (NAPI). In this paper, we present and discuss major changes required to implement such a hybrid scheme in the latest version of Linux kernel 2.6.15. We prove experimentally that the hybrid scheme can significantly improve the performance of general-purpose network desktops or servers running network I/O-bound applications, when subjecting such network hosts to both light and heavy traffic load conditions. The performance is measured and analyzed in terms of throughput, packet loss, latency, and CPU availability.
KW - High-speed networks
KW - Interrupts
KW - Linux
KW - NAPI
KW - Operating systems
UR - http://www.scopus.com/inward/record.url?scp=57349136699&partnerID=8YFLogxK
U2 - 10.1016/j.comcom.2008.10.001
DO - 10.1016/j.comcom.2008.10.001
M3 - Article
AN - SCOPUS:57349136699
SN - 0140-3664
VL - 32
SP - 179
EP - 188
JO - Computer Communications
JF - Computer Communications
IS - 1
ER -