Performance of Quantized Congestion Notification in TCP Incast scenarios in data centers
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This paper analyzes the performance of Ethernet layer congestion control mechanism Quantized Congestion Noti- ﬁcation (QCN) during data access from clustered servers in data centers. We analyze the reasons why QCN does not perform adequately in these situations and propose several modiﬁcations to the protocol to improve its performance in these scenarios. We trace the causes of QCN performance degradation to ﬂow rate variability, and show that adaptive sampling at the switch and adaptive self-increase of ﬂow rates at the rate limiter improve performance in a TCP Incast setup signiﬁcantly. We compare the performance of QCN against TCP modiﬁcations in a heterogeneous environment, and show that modiﬁcations to QCN yield better performance.
MateriasQ Science::Q Science (General)
Q Science::QA Mathematics::QA75 Electronic computers. Computer science
T Technology::T Technology (General)
T Technology::TA Engineering (General). Civil engineering (General)
T Technology::TK Electrical engineering. Electronics Nuclear engineering