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sgp-internet-ping
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Update poster

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Ambrose Chua 2018-04-17 21:27:10 +08:00
parent b711db91fa
commit 7853a7f795
2 changed files with 151 additions and 77 deletions
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id="flowPara6548">Latency is a crucial metric to measure network performance, especially in real-time systems. On the Internet, latency can affect user experience as pages and assets only start loading after one round-trip. With latency data, we can better understand the physical aspects of the Internet, make better decisions on server locations, and gamers can choose a better server closer to Singapore.</flowPara><flowPara
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id="flowPara6548">Latency is a crucial metric to measure network performance, especially in real-time systems. On the Internet, latency can affect user experience as pages and assets only start loading after one round-trip. With latency data, we can better understand the physical aspects of the Internet, make better decisions on server locations, and gamers can choose a better server closer to Singapore.</flowPara><flowPara
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id="flowPara6576">To measure latency, I scanned the entire Internet with the tool &quot;masscan&quot;. More details can be found at <flowSpan
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id="flowSpan6574">https://github.com/serverwentdown/sgp-internet-ping</flowSpan>, together with the data collected.</flowPara><flowPara
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id="flowPara4409">Here is a the box plot for data collected from every country. </flowPara><flowPara
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id="flowPara4584">For the purposes of this poster, we will compare the latencies from Singapore to South Korea and the latencies from Singapore to China.</flowPara><flowPara
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id="flowPara4588">From that data, we can perform a 2-sample t-test on the latency data to South Korea and China. </flowPara><flowPara
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id="flowPara4592" /><flowPara
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id="flowPara4594" /><flowPara
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id="flowPara4596" /><flowPara
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id="flowPara4598" /><flowPara
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id="flowPara4600" /><flowPara
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id="flowPara4602" /><flowPara
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id="flowPara4604" /><flowPara
style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:50.00000381px;line-height:129.99999523%;font-family:'Inter UI';-inkscape-font-specification:'Inter UI';text-align:start;text-anchor:start"
id="flowPara4606" /><flowPara
style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:50.00000381px;line-height:129.99999523%;font-family:'Inter UI';-inkscape-font-specification:'Inter UI';text-align:start;text-anchor:start"
id="flowPara4608" /><flowPara
style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:50.00000381px;line-height:129.99999523%;font-family:'Inter UI';-inkscape-font-specification:'Inter UI';text-align:start;text-anchor:start"
style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:40.00000381px;line-height:129.99999523%;font-family:'Inter UI';-inkscape-font-specification:'Inter UI';text-align:start;text-anchor:start"
id="flowPara51330">Let's do a two-sample t test to compare the difference in network latency to the US and the Netherlands:</flowPara><flowPara
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id="flowPara51525" /><flowPara
style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:40.00000381px;line-height:129.99999523%;font-family:'Inter UI';-inkscape-font-specification:'Inter UI';text-align:start;text-anchor:start"
id="flowPara51334" /><flowPara
style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:40.00000381px;line-height:129.99999523%;font-family:'Inter UI';-inkscape-font-specification:'Inter UI Bold';text-align:start;text-anchor:start"
id="flowPara51431">Hypothesis</flowPara><flowPara
style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:40.00000381px;line-height:129.99999523%;font-family:'Inter UI';-inkscape-font-specification:'Inter UI';text-align:start;text-anchor:start"
id="flowPara51433" /><flowPara
style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:40.00000381px;line-height:129.99999523%;font-family:'Inter UI';-inkscape-font-specification:'Inter UI';text-align:start;text-anchor:start"
id="flowPara51336">H<flowSpan
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id="flowSpan51338">0</flowSpan>: μ<flowSpan
style="font-size:65.00000954%;baseline-shift:sub"
id="flowSpan51360">1</flowSpan> = μ<flowSpan
style="font-size:65.00000954%;baseline-shift:sub"
id="flowSpan51366">2</flowSpan></flowPara><flowPara
style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:40.00000381px;line-height:129.99999523%;font-family:'Inter UI';-inkscape-font-specification:'Inter UI';text-align:start;text-anchor:start"
id="flowPara51340">H<flowSpan
style="font-size:65.00000954%;baseline-shift:sub"
id="flowSpan51354">a</flowSpan>: μ<flowSpan
style="font-size:65.00000954%;baseline-shift:sub"
id="flowSpan51362">1</flowSpan> &lt; μ<flowSpan
style="font-size:65.00000954%;baseline-shift:sub"
id="flowSpan51364">2</flowSpan></flowPara><flowPara
style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:40.00000381px;line-height:129.99999523%;font-family:'Inter UI';-inkscape-font-specification:'Inter UI';text-align:start;text-anchor:start"
id="flowPara51356" /><flowPara
style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:40.00000381px;line-height:129.99999523%;font-family:'Inter UI';-inkscape-font-specification:'Inter UI';text-align:start;text-anchor:start"
id="flowPara51358">Where μ<flowSpan
style="font-size:65.00000954%;baseline-shift:sub"
id="flowSpan51372">1</flowSpan> is the mean latency to the US and μ<flowSpan
style="font-size:65.00000954%;baseline-shift:sub"
id="flowSpan51374">2</flowSpan> is the mean latency to the Netherlands. </flowPara><flowPara
style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:40.00000381px;line-height:129.99999523%;font-family:'Inter UI';-inkscape-font-specification:'Inter UI';text-align:start;text-anchor:start"
id="flowPara51435" /><flowPara
style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:40.00000381px;line-height:129.99999523%;font-family:'Inter UI';-inkscape-font-specification:'Inter UI Bold';text-align:start;text-anchor:start"
id="flowPara51437">Conditions</flowPara><flowPara
style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:40.00000381px;line-height:129.99999523%;font-family:'Inter UI';-inkscape-font-specification:'Inter UI';text-align:start;text-anchor:start"
id="flowPara51439" /><flowPara
style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:40.00000381px;line-height:129.99999523%;font-family:'Inter UI';-inkscape-font-specification:'Inter UI';text-align:start;text-anchor:start"
id="flowPara51441">SRS: Let's assume the sample to be a simple random sample. </flowPara><flowPara
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id="flowPara51443">Independence: </flowPara><flowPara
style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:40.00000381px;line-height:129.99999523%;font-family:'Inter UI';-inkscape-font-specification:'Inter UI';text-align:start;text-anchor:start"
id="flowPara51445">Normality: </flowPara><flowPara
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id="flowPara51449" /><flowPara
style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:40.00000381px;line-height:129.99999523%;font-family:'Inter UI';-inkscape-font-specification:'Inter UI Bold';text-align:start;text-anchor:start"
id="flowPara51495">Calculation</flowPara><flowPara
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id="flowPara51493">(Performed using the code available on GitHub)</flowPara><flowPara
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id="flowPara51511" /><flowPara
style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:40.00000381px;line-height:129.99999523%;font-family:'Inter UI';-inkscape-font-specification:'Inter UI';text-align:start;text-anchor:start"
id="flowPara51509">t = </flowPara><flowPara
style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:40.00000381px;line-height:129.99999523%;font-family:'Inter UI';-inkscape-font-specification:'Inter UI';text-align:start;text-anchor:start"
id="flowPara4604">P-value = </flowPara><flowPara
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id="flowPara51513" /><flowPara
style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:40.00000381px;line-height:129.99999523%;font-family:'Inter UI';-inkscape-font-specification:'Inter UI Bold';text-align:start;text-anchor:start"
id="flowPara51515">Conclusion</flowPara><flowPara
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id="flowPara51517" /><flowPara
style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:40.00000381px;line-height:129.99999523%;font-family:'Inter UI';-inkscape-font-specification:'Inter UI';text-align:start;text-anchor:start"
id="flowPara4608">Since the P-value is _ than 0.05, we _ H0 as there is _sufficient evidence to conclude that the mean latency to the US is lower than the mean latency to the Netherlands. </flowPara><flowPara
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id="flowPara4610" /><flowPara
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style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:40.00000381px;line-height:129.99999523%;font-family:'Inter UI';-inkscape-font-specification:'Inter UI';text-align:start;text-anchor:start"
id="flowPara4617" /><flowPara
style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:50.00000381px;line-height:129.99999523%;font-family:'Inter UI';-inkscape-font-specification:'Inter UI';text-align:start;text-anchor:start"
id="flowPara4619">We can generalise this to any two countries, by </flowPara></flowRoot> <g
style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:40.00000381px;line-height:129.99999523%;font-family:'Inter UI';-inkscape-font-specification:'Inter UI';text-align:start;text-anchor:start"
id="flowPara4619">We can generalise this to any two countries, by applying the same formula on different pairs of data. </flowPara><flowPara
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id="flowPara51429">Limitations</flowPara><flowPara
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id="flowPara51529">1. We had to assume it was a simple random sample. However, due to the way the scan was performed (it only scanned a select set of ports), it would be limited to a subsubset of servers (that expose the 5 most common ports). </flowPara><flowPara
style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:40.00000381px;line-height:129.99999523%;font-family:'Inter UI';-inkscape-font-specification:'Inter UI';text-align:start;text-anchor:start"
id="flowPara51531" /><flowPara
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id="flowPara51533">2. Due to time limitations, I did not filter out outliers. That will be done in the future when I allocate some time and have a drastic effect on the results. </flowPara><flowPara
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id="flowPara51535" /><flowPara
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id="flowPara51537">3. The mapping from IP to geolocation is not perfect and can result in many invalid data points. There's no way to guaranteee acuracy.</flowPara></flowRoot> <g
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