Phase plots

Phase plots for successive rtts

For each server, we computed correlations for the first 5 rounds of each TCP transfer. The results are in the table below each phase plot. The phase plots show the relationship between the first and second data rounds, which corresponds to column 3 in the tables.

(above)

    syn-ack    req-rep     data 1     data 2
    req-rep    data 1      data 2     data 3
      0.203      0.180      0.220      0.364

(above)

    syn-ack    req-rep     data 1     data 2
    req-rep    data 1      data 2     data 3
   (-0.113)    (0.126)    (0.076)   (-0.108)

(above)

    syn-ack    req-rep     data 1     data 2
    req-rep    data 1      data 2     data 3
   (-0.082)   (-0.131)      0.702      0.770
The correlation between successive rtts appears to be strong, but the first two correlations are insignificant because they involve the request-reply round, which in this case is determined by the server and does not depend on network conditions.

(above)

    syn-ack    req-rep     data 1     data 2
    req-rep    data 1      data 2     data 3
    (0.096)      0.265   (-0.034)   (-0.008)

(above)

    syn-ack    req-rep     data 1     data 2
    req-rep    data 1      data 2     data 3
    (0.116)   (-0.121)    (0.088)    (0.092)

(above)

    syn-ack    req-rep     data 1     data 2
    req-rep    data 1      data 2     data 3
      0.671      0.640      0.736      0.713

(above)

    syn-ack    req-rep     data 1     data 2
    req-rep    data 1      data 2     data 3
      0.396      0.334      0.310      0.326

(above)

    syn-ack    req-rep     data 1     data 2
    req-rep    data 1      data 2     data 3
    (0.044)   (-0.020)   (-0.185)   (-0.269)

(above)

    syn-ack    req-rep     data 1     data 2
    req-rep     data 1     data 2     data 3
      0.721      0.682      0.657      0.638

(above)

    syn-ack    req-rep     data 1     data 2
    req-rep    data 1      data 2     data 3
      0.184    (0.081)    (0.157)   (-0.144)

(above)

    syn-ack    req-rep     data 1     data 2
    req-rep    data 1      data 2     data 3
      0.811      0.745      0.874      0.915

(above)

    syn-ack    req-rep     data 1     data 2
    req-rep    data 1      data 2     data 3
      0.631      0.625      0.875      0.895

(above)

    syn-ack    req-rep     data 1     data 2
    req-rep    data 1      data 2     data 3
   (-0.040)    (0.101)   (-0.047)   (-0.043)