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

By Santosh Kulkarni, Prathima Agrawal

This booklet addresses the necessity to enhance TCP’s functionality within facts facilities via supplying recommendations which are either functional and backward suitable with ordinary TCP types. The authors technique this problem first via deriving an analytical version for TCP’s functionality lower than normal facts middle workload site visitors. They then speak about a few suggestions which are designed to enhance TCP functionality through both proactively detecting community congestion via probabilistic retransmission or by way of fending off timeout penalty via dynamic resizing of TCP segments. Experimental effects exhibit that every of ideas mentioned outperforms general 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)

Example text

TCP is at the core of several data center applications like distributed filesystems [14, 15], cluster computing [16, 17], parallel databases [18] as well as disaster recovery [19, 20]. However, recent works have shown that under certain many-to-one traffic patterns, data center networks experience Incast: a drastic collapse in throughput due to TCP timeouts triggered by severe packet losses at Ethernet [21] switches [22–24]. In typical Incast communication pattern, a receiver issues synchronized data requests to multiple senders.

2. Unlike other connection establishing protocols, three-way handshake does not require communicating endpoints to begin transmissions with same sequence numbers. Furthermore, three-way handshake can be used to establish a TCP connection even in absence of a global clock. The mechanism can also prevent old connection initializations and data packets from causing any confusion. Additionally, the endpoints can exchange parameter and option information such as MSS, during connection establishment [7].

In this simple example, the sliding window spans over four bytes of the data stream. The sequence numbers within the sender’s window represent the bytes sent but as yet not acknowledged. All sequence numbers to the left of the sliding window are bytes that were transmitted and also acknowledged; sequence numbers to the right of the sliding window are bytes that are yet to be transmitted. As bytes in the window get acknowledged and new bytes get transmitted the window “slides”, moving from left to right.

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