By Santosh Kulkarni, Prathima Agrawal

This publication addresses the necessity to enhance TCP’s functionality within facts facilities through offering suggestions which are either useful and backward suitable with general TCP models. The authors procedure this problem first by means of deriving an analytical version for TCP’s functionality less than average facts middle workload site visitors. They then speak about a few ideas which are designed to enhance TCP functionality via both proactively detecting community congestion via probabilistic retransmission or by way of warding off timeout penalty via dynamic resizing of TCP segments. Experimental effects exhibit that every of innovations mentioned outperforms regular TCP within a knowledge heart.

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

Example text

10) k=1 = 1 pc For the ith TD-period let flows xe , e = 1,. , ji (subset of n composite flows) be the ji flows experiencing loss at the end of the period. The same xe flows do not experience loss in every TD-period. Instead, the TD-periods in which these xe flows experience loss are a subset ({i s }, s = 1, 2,. ) of TD-periods of the cumulative flow F. For example, in Fig. 2, only flow f 2 experiences loss in T D Pi . Its next loss could perhaps happen in the period T D Pi+2 . 1 Modeling Incast 39 during these X f xe rounds, the congestion window of flows xe increase by X f xe is is packets.

In this equation, we can approximate j, the mean number of flows experiencing a loss in a round, with the expression pprc . Since j must be no more than n, we have j = min n, pr pc . 3 Timeout Loss Indications In this subsection we model the throughput of cumulative flow for loss indications that are of type “time out” (TO). As already mentioned, TCP’s throughput collapse in many-to-one synchronized communication is mainly caused by two kinds of timeouts, namely, Intermediate Block Transfer Timeouts (IBTT) and Anterior Block Transfer Timeouts (ABTT).

With pr , we denote the probability that a packet (belonging to any composite flow) is lost, given that either it is the flow’s first packet in its round or the flow’s preceding packet in its round is not lost. In this subsection, we are interested in establishing a relationship B(n, pc , pr ) between the throughput of the cumulative flow F and n the number of parallel synchronized flows involved, pc the loss probability of the cumulative flow as well as pr the loss probability in any composite flow f.

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Analysis of TCP Performance in Data Center Networks (SpringerBriefs in Electrical and Computer Engineering) by Santosh Kulkarni, Prathima Agrawal


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