By Santosh Kulkarni, Prathima Agrawal
This ebook addresses the necessity to increase TCP’s functionality inside of information facilities via offering strategies which are either sensible and backward suitable with general TCP types. The authors procedure this problem first by means of deriving an analytical version for TCP’s functionality less than general facts middle workload site visitors. They then speak about a few options 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 express that every of thoughts mentioned outperforms ordinary TCP inside of a knowledge center.
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Extra resources for Analysis of TCP Performance in Data Center Networks
U k are ACKed, another k packets, s1 , . . , sk are sent in the next round, which we will refer to as the “loss” round. This round of packets may have another loss, say packet sm+1 . Again, our assumptions on packet loss correlation mandates that packets sm+2 , . . , sk are also lost in the loss round. The m packets successfully sent in the loss round are responded to by ACKs for packet u k , which are counted as duplicate ACKs. If the number of such ACKs is higher than three, then a TD indication occurs, otherwise an IBTT occurs.
J. Postel, Simple mail transfer protocol, RFC 821 (Standard), Internet engineering task force, obsoleted by RFC 2821. Aug 1982. [Online]. txt 11. C. Feather, Network news transfer protocol (NNTP), RFC 3977 (Proposed standard), Internet engineering task force, updated by RFC 6048. Oct 2006. [Online]. ietf. txt 12. T. Ylonen, C. Lonvick, The secure shell (SSH) protocol architecture, RFC 4251 (Proposed standard), Internet engineering task force, Jan 2006. [Online]. txt 13. T. Ylonen, C. Lonvick, The secure shell (SSH) authentication protocol, RFC 4252 (Proposed standard), Internet engineering task force, Jan 2006.
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. The Slow Start phase is usually much shorter than the Congestion Avoidance phase and for the sake of simplicity, we choose to ignore this phase in our model of Incast. Despite these aforementioned approximations, we believe that we have still managed to capture the essential aspects of the Incast phenomenon, as indicated by the generally good fit between our model and the simulations as discussed in Sect.
Analysis of TCP Performance in Data Center Networks by Santosh Kulkarni, Prathima Agrawal