deletions | additions       diff --git a/existing work.tex b/existing work.tex  index d7c7f29..3d2cf3f 100644  --- a/existing work.tex  +++ b/existing work.tex 
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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.  Another type of approaches are explicit flow control in switch/router, e.g. D3, PDQ, pFabric [5-7]. Though the design can be much easier, and simulation results seem great, it is hard to implement into real world, because they need hardware changes such as special-designed switch/router. The table below shows the comparison of 5 approaches in five metrics. \begin{table}   \begin{tabular}{lccccc}   \hline   \textbf{Protocol} & \textbf{Fast response/no-complex rate control} & \textbf{Compatibility} & \textbf{Distributed Design} & \textbf{Share Info} & \textbf{Preemptive} \\   1 ZAMS & 0 & 16 & 15 & -- & 5.0 \\   2 Case B & 9.89 & 15.92 & 14.94 & 0.14 & 5.1 \\   3 ECCB & 11.30 & 3.71 & 20.86 & 6.44 & 42.7 \\   4 ECHB & 18.10 & -- & 16.76 & -- & -- \\   5 ICB & 18.56 & -- & 12.85 & -- & -- \\   6 ECCB & 18.56 & -- & 12.83 & -- & -- \\   \hline   \end{tabular}   \caption{\textbf{Some descriptive statistics about fruit and vegetable consumption among high school students in the U.S.} While bananas and apples still top the list of most popular fresh fruits, the amount of bananas consumed grew from 7 pounds per person in 1970 to 10.4 pounds in 2010, whereas consumption of fresh apples decreased from 10.4 pounds to 9.5 pounds. Watermelons and grapes moved up in the rankings.}   \end{table}