DocumentCode :
1802054
Title :
Absorbing micro-burst traffic by enhancing dynamic threshold policy of data center switches
Author :
Danfeng Shan ; Wanchun Jiang ; Fengyuan Ren
Author_Institution :
Tsinghua Nat. Lab. for Inf. Sci. & Technol., Beijing, China
fYear :
2015
fDate :
April 26 2015-May 1 2015
Firstpage :
118
Lastpage :
126
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.
Keywords :
telecommunication switching; telecommunication traffic; EDT policy; buffer management policy; data center networks; data center switches; enhanced dynamic threshold policy; memory fair sharing; microburst traffic; on-chip shared memory; switch buffer; Computers; Conferences; Memory management; Nickel; Ports (Computers); Queueing analysis; Steady-state; dynamic threshold; micro-burst; packet dropping; shared memory; switch buffer management;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Computer Communications (INFOCOM), 2015 IEEE Conference on
Conference_Location :
Kowloon
Type :
conf
DOI :
10.1109/INFOCOM.2015.7218374
Filename :
7218374
Link To Document :
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