Download e-book for kindle: Analysis of TCP Performance in Data Center Networks by Santosh Kulkarni, Prathima Agrawal

By Santosh Kulkarni, Prathima Agrawal

ISBN-10: 146147860X

ISBN-13: 9781461478607

ISBN-10: 1461478618

ISBN-13: 9781461478614

This e-book addresses the necessity to increase TCP’s functionality inside of info facilities by way of offering recommendations which are either functional and backward suitable with typical TCP types. The authors technique this problem first via deriving an analytical version for TCP’s functionality less than common info middle workload site visitors. They then talk about a few strategies which are designed to enhance TCP functionality by way of both proactively detecting community congestion via probabilistic retransmission or by way of fending off timeout penalty via dynamic resizing of TCP segments. Experimental effects convey that every of suggestions mentioned outperforms common TCP inside of a knowledge center.

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Extra resources for Analysis of TCP Performance in Data Center Networks

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Following a timeout, TCP uses a mechanism called “Slow Start” to increase its congestion window. Slow Start operates by observing that the rate at which new packets should be injected into the network is the rate at which the acknowledgments are returned by the other end. Unlike the Congestion Avoidance phase where the congestion window is increased by one segment per round trip time, the Slow Start increases the congestion window by one segment for every ACK received. This provides for an exponential growth of the congestion window after it was reduced to one following a timeout.

Henceforth we will refer to the model expressed in Eq. 39 as the “Full Model”. 2 Validation and Analysis In this section, we validate the performance of our Incast model using the ns-2 simulator. With simulations we demonstrate that the throughput expression derived in the previous section works relatively well for broad range of conditions. For our ns-2 simulations, we used the topology depicted in Fig. 7 which is commonly used to study a set of parallel, synchronized flows sharing the same bottleneck link.

1) This adjustment to congestion window is executed on every incoming ACK that acknowledges new data during the congestion avoidance phase. When a TCP sender detects segment loss through expiry of the retransmission timer and the segment in question has not yet been retransmitted, TCP sets the value of its ssthresh according to Eq. 2. Furthermore, upon a timeout, TCP sets the value of its cwnd to one MSS. Therefore, after retransmitting the dropped segment, TCP sender uses slow start algorithm to increase the size of its congestion window (cwnd) from one MSS to the new value of ssthresh, at which point congestion avoidance again takes over [21].

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

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