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Analysis of TCP Performance in Data Center Networks by Santosh Kulkarni, Prathima Agrawal

By Santosh Kulkarni, Prathima Agrawal

This ebook addresses the necessity to enhance TCP’s functionality within info facilities by way of delivering ideas which are either functional and backward appropriate with commonplace TCP types. The authors strategy this problem first via deriving an analytical version for TCP’s functionality lower than common info heart workload site visitors. They then speak about a few recommendations which are designed to enhance TCP functionality by means of both proactively detecting community congestion via probabilistic retransmission or via warding off timeout penalty via dynamic resizing of TCP segments. Experimental effects exhibit that every of thoughts mentioned outperforms commonplace TCP within an information middle.

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Extra resources for Analysis of TCP Performance in Data Center Networks (SpringerBriefs in Electrical and Computer Engineering)

Example text

1. Between two TD loss indications, the composite flows are all in congestion avoidance and the cumulative window increases by n packets per round, as discussed above. 1 Modeling Incast 35 Fig. 1 Evolution of cumulative window W over time when loss indications are TDs Immediately after a loss indication occurs, any composite flow f experiencing a loss, reduces its congestion window size W f by a factor of two. This implies that a loss W experiencing flow f , will also reduce the cumulative window W, by 2 f packets.

563974s, experiences a TO. Since the loss indicator is a timeout, sender 1 waits for a period of time T0 , defined by TCP’s retransmission timer before retransmitting its lost packets. And although the other servers involved in the block transfer complete transmitting their share of the block well before the recovery of sender 1, the client does not make a request for a new block till sender 1 also follows suit. 764448s, which results in throughput collapse. 559886s, were all successfully transmitted, the server received less than 3 duplicate ACKs resulting in a TO.

Consider n parallel TCP flows f 1 , . . , f n sharing the same bottleneck link inside a data center network. e. in a round, all flows send packets in their current congestion window before the next round starts for all of them). For each flow f , the round starts with the back-to-back transmission of W f packets, where W f is the size of the flow’s current congestion window. Once all packets falling within the congestion window of all n flows have been sent in this back-to-back manner, no other packets are sent until each flow f , receives an ACK for one of its W f packets already sent.

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