NDLI: Absorbing micro-burst traffic by enhancing dynamic threshold policy of data center switches

Content Provider	IEEE Xplore Digital Library
Author	Danfeng Shan Wanchun Jiang Fengyuan Ren
Copyright Year	2015
Description	Author affiliation: Tsinghua Nat. Lab. for Inf. Sci. & Technol., Beijing, China (Danfeng Shan; Fengyuan Ren) \|\| Dept. of Comput. Sci. & Technol., Tsinghua Univ., Beijing, China (Wanchun Jiang)
Abstract	In data center networks, micro-burst is a common traffic pattern and the packet dropping caused by it usually leads to serious performance degradation. Meanwhile, most of the current commodity switches employ on-chip shared memory, and the buffer management policies of them ensure fair sharing of memory among all ports. Among various polices, Dynamic Threshold (DT) is widely used by switch vendors. However, because DT needs to reserve a fraction of switch buffer, there is free buffer space while packets from micro-burst traffic are dropped. In this paper, we theoretically deduce the sufficient conditions for packet dropping caused by micro-burst traffic, and estimate the corresponding free buffer size. The results show that the free buffer size is very large when the number of overloaded ports is small. What's worse, to ensure fair sharing of memory among output ports, packets from micro-burst traffic may be dropped even when the traffic size is much smaller than the buffer size. In light of these results, we propose Enhanced Dynamic Threshold (EDT) policy, which can alleviate packet dropping caused by micro-burst traffic through fully utilizing the switch buffer and temporarily relaxing the fairness constraint. The simulation results show that EDT can absorb more micro-burst traffic than DT.
Starting Page	118
Ending Page	126
File Size	258509
Page Count	9
File Format	PDF
ISBN	9781479983810
DOI	10.1109/INFOCOM.2015.7218374
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-04-26
Publisher Place	Hong Kong
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Ports (Computers) Steady-state Nickel Conferences Computers Memory management Queueing analysis packet dropping dynamic threshold switch buffer management shared memory micro-burst
Content Type	Text
Resource Type	Article

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