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Paper Abstract and Keywords
Presentation 2014-01-24 10:50
[Encouragement Talk] QCN with Delay-based Congestion Detection in Data Center Networks
Yuki Tanisawa, Miki Yamamoto (Kansai Univ.) NS2013-174
Abstract (in Japanese) (See Japanese page) 
(in English) QCN(Quantized Congestion Notification) is Layer 2 congestion control in data center network. QCN controls sender's transmission rate with feedback information from a congested switch. We have already revealed that there are sender(s) that cannot receive any feedback frame during congestion period due to probabilistic feedback transmission behavior when the number of flows going through a congested link increases, which causes unstable queue length behavior. To resolve this technical problem, we proposed QCN/DC which integrates QCN with delay-based congestion control. In this paper, we propose new methods for two remained technical problem of QCN/DC; 1) Link utilization becomes low when a new flow joins, 2) RTT threshold for switching between QCN and delay-based congestion control should be adaptively defined. For the former problem, we propose smooth switching which moderately switches transmission rate when transmission rate decision moves from delay-based to QCN. For the latter problem, adaptive threshold computed by measured RTT is proposed. Our simulation results for various scenarios show that our proposed methods regulate queue length fluctuation adequately.
Keyword (in Japanese) (See Japanese page) 
(in English) QCN / Data center / Delay-based / Congestion control / / / /  
Reference Info. IEICE Tech. Rep., vol. 113, no. 388, NS2013-174, pp. 65-70, Jan. 2014.
Paper # NS2013-174 
Date of Issue 2014-01-16 (NS) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
Copyright
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reproduction		 All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF NS2013-174

Conference Information
Committee NS  
Conference Date 2014-01-23 - 2014-01-24 
Place (in Japanese) (See Japanese page) 
Place (in English) Univ. of the Ryukyus 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Network Software, Network Application, SOA/SDP, NGN, IMS, API, Grid 
Paper Information
Registration To NS 
Conference Code 2014-01-NS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) QCN with Delay-based Congestion Detection in Data Center Networks 
Sub Title (in English)  
Keyword(1) QCN  
Keyword(2) Data center  
Keyword(3) Delay-based  
Keyword(4) Congestion control  
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1st Author's Name Yuki Tanisawa  
1st Author's Affiliation Kansai University (Kansai Univ.)
2nd Author's Name Miki Yamamoto  
2nd Author's Affiliation Kansai University (Kansai Univ.)
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Speaker Author-1 
Date Time 2014-01-24 10:50:00 
Presentation Time 25 minutes 
Registration for NS 
Paper # NS2013-174 
Volume (vol) vol.113 
Number (no) no.388 
Page pp.65-70 
#Pages 6 
Date of Issue 2014-01-16 (NS) 

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