{"id":163793,"date":"2012-01-01T00:00:00","date_gmt":"2012-01-01T00:00:00","guid":{"rendered":"https:\/\/www.microsoft.com\/en-us\/research\/msr-research-item\/tuning-ecn-for-data-center-networks\/"},"modified":"2023-09-11T12:20:03","modified_gmt":"2023-09-11T19:20:03","slug":"tuning-ecn-for-data-center-networks","status":"publish","type":"msr-research-item","link":"https:\/\/www.microsoft.com\/en-us\/research\/publication\/tuning-ecn-for-data-center-networks\/","title":{"rendered":"Tuning ECN for Data Center Networks"},"content":{"rendered":"<div class=\"asset-content\">\n<p>There have been some serious concerns about the TCP per-formance in data center networks, including the long comple-tion time of short TCP flows in competition with long TCP flows, and the congestion due to TCP incast. In this paper, we show that a properly tuned instant queue length based Explicit Congestion Notification (ECN) at the intermediate<br \/>\nswitches can alleviate both problems. Compared with previ-ous work, our approach is appealing as it can be supported on current commodity switches with a simple parameter set-ting and it does not need any modification on ECN proto-col at the end servers. Furthermore, we have observed a dilemma in which a higher ECN threshold leads to higher<br \/>\nthroughput for long flows whereas a lower threshold leads to more senders on incast under buffer pressure. We address this problem with a switch modification only scheme &#8211; dequeue marking, for further tuning the instant queue length based ECN to achieve optimal incast performance and long flow throughput with a single threshold value. Our experimental study demonstrates that dequeue marking is effective for increasing the maximum incast senders close to the per-formance limit of ECN, achieving a gain anywhere from 16% to 140%.<\/p>\n<\/div>\n<p><!-- .asset-content --><\/p>\n","protected":false},"excerpt":{"rendered":"<p>There have been some serious concerns about the TCP per-formance in data center networks, including the long comple-tion time of short TCP flows in competition with long TCP flows, and the congestion due to TCP incast. In this paper, we show that a properly tuned instant queue length based Explicit Congestion Notification (ECN) at the 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