Santosh Kulkarni, Prathima Agrawal's Analysis of TCP Performance in Data Center Networks PDF

By Santosh Kulkarni, Prathima Agrawal

This ebook addresses the necessity to increase TCP’s functionality inside of facts facilities by way of delivering ideas which are either sensible and backward suitable with commonplace TCP models. The authors strategy this problem first by way of deriving an analytical version for TCP’s functionality less than usual facts heart workload site visitors. They then talk about a few suggestions which are designed to enhance TCP functionality by means of both proactively detecting community congestion via probabilistic retransmission or by means of heading off timeout penalty via dynamic resizing of TCP segments. Experimental effects express that every of strategies mentioned outperforms average TCP within a knowledge heart.

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

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For the ith TD-period this includes packets sent in the last round of the (i − 1)th TD-period, starting from the γ(i−1) th packet till the end of the window (βi−1 packets) and the packets sent in the next X i rounds till the γi th packet. If flows xe , e = 1,. , ji experience loss in the (i − 1)th TDare their respective congestion window sizes at the end of the period and W f xe i−1 (i − 1)th TD-period, the window size of the cumulative flow at the beginning of the ith TD-period is Wi = Wi−1 − ji−1 W f xei−1 e=1 2 + (n − ji−1 ) , where, ji flows reduce their congestion windows by factor of two while the remaining (n − ji−1 ) flows increase their window size by one segment.

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].

This means that, when all n composite flows are in congestion avoidance phase and none of them experience a loss, the cumulative window size of all n flows increases linearly in time, with the slope of n packets per round trip time. , if a packet is lost, all remaining packets transmitted until the end of that round, irrespective of which flow they belong to, are also lost). Hence, more than one among n composite flows could potentially experience a loss event in the same round. But TCP flows that experience a loss, reduce their congestion window only once per round trip time.

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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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