Sharing Bandwidth by Allocating Switch Buffer in Data Center Networks

Jiao Zhang

doi:10.1109/JSAC.2014.140105

Sharing Bandwidth by Allocating Switch Buffer in Data Center Networks

2014-01-01

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DOI：10.1109/JSAC.2014.140105

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In today's data centers, the round trip propagation delay is quite small. Therefore, switch buffer sizes are much larger than the Bandwidth Delay Product (BDP). Based on this observation, in this paper we introduce a new transport protocol which provides bandwidth Sharing by Allocating switch Buffer (SAB) for data centers. SAB sets the congestion windows for flows based on the buffer size of the switches along the path. On one hand, as long as the total buffer allocated to all the flows is larger than the BDP, the network bandwidth can be fully utilized. On the other hand, since SAB only allocates the buffer space to flows, the totally injected traffic will not exceed the network capacity. Thus, SAB rarely loses packets. SAB also reduces flow completion time by allowing flows to reach their fair share of bandwidth quickly. The results of a series of experiments and simulations demonstrate that SAB has the features of fast convergence and rare packet loss. It reduces the latency of short flows and solves the TCP Incast and TCP Outcast problems.

Keywords:

Data Center Networks

Transport Protocol

Fast Convergence

Rare Loss

Sharing Bandwidth by Allocating Switch Buffer in Data Center Networks

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