deletions | additions       diff --git a/existing work.tex b/existing work.tex  index c606fb7..8e35a3a 100644  --- a/existing work.tex  +++ b/existing work.tex 
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\section{Existing Work}   To address the problem of congestion in datacenter, there are mainly two type types  of work. The first one is implicit congestion control by using ECN to forecast buffer overflow in switch/router, e.g. DCTCP [3] and D2TCP [4]. These works are well-compatible with current devices. However modifying the size of slide windows smoothly needs more than a several RTTs of time. This seemly short period of time is actually to the small flows. 
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\begin{tabular}{lccccc}  \hline  \textbf{Protocol} & \textbf{Fast response /no-complex rate control} & \textbf{Compatibility} & \textbf{Distributed Design} & \textbf{Share Info(scalable)} & \textbf{Preemptive} \\   DCTCP & 0 & 16 $\surd$  & 15 & -- & 5.0 \\ D2TCP & 9.89 & 15.92 & 14.94 & 0.14 & 5.1 \\  D3 & 11.30 & 3.71 & 20.86 & 6.44 & 42.7 \\  PDQ & 18.10 & -- & 16.76 & -- & -- \\