DocumentCode :
2379339
Title :
The war between mice and elephants
Author :
Guo, Liang ; Matta, Ibrahim
Author_Institution :
Dept. of Comput. Sci., Boston Univ., MA, USA
fYear :
2001
fDate :
11-14 Nov. 2001
Firstpage :
180
Lastpage :
188
Abstract :
Recent measurement based studies reveal that most of the Internet connections are short in terms of the amount of traffic they carry (mice), while a small fraction of the connections are carrying a large portion of the traffic (elephants). A careful study of the TCP protocol shows that without help from an active queue management (AQM) policy, short connections tend to lose to long connections in their competition for bandwidth. This is because short connections do not gain detailed knowledge of the network state, and therefore they are doomed to be less competitive due to the conservative nature of the TCP congestion control algorithm. Inspired by the differentiated services (Diffserv) architecture, we propose to give preferential treatment to short connections inside the bottleneck queue, so that short connections experience less packet drop rate than long connections. This is done by employing the RIO (RED with In and Out) queue management policy which uses different drop functions for different classes of traffic. Our simulation results show that: (1) in a highly loaded network, preferential treatment is necessary to provide short TCP connections with better response time and fairness without hurting the performance of long TCP connections; (2) the proposed scheme still delivers packets in FIFO manner at each link, thus it maintains statistical multiplexing gain and does not misorder packets; (3) choosing a smaller default initial timeout value for TCP can help enhance the performance of short TCP flows, however not as effectively as our scheme and at the risk of congestion collapse; (4) in the worst case, our proposal works as well as a regular RED scheme, in terms of response time and goodput.
Keywords :
Internet; queueing theory; telecommunication congestion control; telecommunication traffic; transport protocols; Diffserv architecture; FIFO packet delivery; Internet connections; RED scheme; RIO queue management policy; TCP congestion control algorithm; TCP protocol; active queue management policy; bottleneck queue; differentiated services; drop functions; elephants; fairness; goodput; long connections; mice; packet drop rate; response time; short connections; simulation results; statistical multiplexing gain; traffic; Bandwidth; Delay; Diffserv networks; Internet; Mice; Performance gain; Proposals; Protocols; Telecommunication traffic; Traffic control;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Network Protocols, 2001. Ninth International Conference on
Print_ISBN :
0-7695-1429-4
Type :
conf
DOI :
10.1109/ICNP.2001.992898
Filename :
992898
Link To Document :
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