David Zats, Tathagata Das, Prashanth Mohan, Dhruba Borthakur and Randy H. Katz
EECS Department
University of California, Berkeley
Technical Report No. UCB/EECS-2012-33
March 15, 2012
http://www2.eecs.berkeley.edu/Pubs/TechRpts/2012/EECS-2012-33.pdf
Web applications have now become so sophisticated that rendering a typical page may require hundreds of intra-datacenter flows. At the same time, web sites must meet strict page creation deadlines of 200-300ms to satisfy user demands for interactivity. Long-tailed flow completion times make it challenging for web sites to meet these constraints. They are forced to choose between rendering a subset of the complex page, or delay its rendering, thus missing deadlines and sacrificing either quality or responsiveness. Either option leads to potential financial loss.
In this paper, we present a new cross-layer network stack aimed at reducing the long tail of flow completion times. The approach exploits cross-layer information to reduce packet drops, prioritize latency-sensitive flows, and evenly distribute network load, effectively reducing the long tail of flow completion times. We evaluate our approach through NS-3 based simulation and Click-based implementation demonstrating our ability to consistently reduce the tail across a wide range of workloads. We commonly achieve reductions of over 50\% in 99.9th percentile flow completion times without significantly impacting the median.
BibTeX citation:
@techreport{Zats:EECS-2012-33, Author = {Zats, David and Das, Tathagata and Mohan, Prashanth and Borthakur, Dhruba and Katz, Randy H.}, Title = {DeTail: Reducing the Flow Completion Time Tail in Datacenter Networks}, Institution = {EECS Department, University of California, Berkeley}, Year = {2012}, Month = {Mar}, URL = {http://www2.eecs.berkeley.edu/Pubs/TechRpts/2012/EECS-2012-33.html}, Number = {UCB/EECS-2012-33}, Abstract = {Web applications have now become so sophisticated that rendering a typical page may require hundreds of intra-datacenter flows. At the same time, web sites must meet strict page creation deadlines of 200-300ms to satisfy user demands for interactivity. Long-tailed flow completion times make it challenging for web sites to meet these constraints. They are forced to choose between rendering a subset of the complex page, or delay its rendering, thus missing deadlines and sacrificing either quality or responsiveness. Either option leads to potential financial loss. In this paper, we present a new cross-layer network stack aimed at reducing the long tail of flow completion times. The approach exploits cross-layer information to reduce packet drops, prioritize latency-sensitive flows, and evenly distribute network load, effectively reducing the long tail of flow completion times. We evaluate our approach through NS-3 based simulation and Click-based implementation demonstrating our ability to consistently reduce the tail across a wide range of workloads. We commonly achieve reductions of over 50\% in 99.9th percentile flow completion times without significantly impacting the median.} }
EndNote citation:
%0 Report %A Zats, David %A Das, Tathagata %A Mohan, Prashanth %A Borthakur, Dhruba %A Katz, Randy H. %T DeTail: Reducing the Flow Completion Time Tail in Datacenter Networks %I EECS Department, University of California, Berkeley %D 2012 %8 March 15 %@ UCB/EECS-2012-33 %U http://www2.eecs.berkeley.edu/Pubs/TechRpts/2012/EECS-2012-33.html %F Zats:EECS-2012-33