[e2e] tcp questions
Fiandra Riccardo
riccardo.fiandra at fastweb.it
Fri Jan 31 03:22:26 PST 2003
Gents,
I have some questions on traces captured on a tcp session.
This may be the right place where to address my doubts.
I thank in advance anyone who mhy give me some hint.
Scenario is a Sender and a Receiver, with the sender sending a stored video
file. Receiver buffer is empty and "hungry" of data, 48180 is the maximum
advertised receiver window.
- From the first set of packets:
Doesn't it look the receiver is sending too few ACKs, somewhere in
literature, is described the stretch acks bug.
Might this be the case?
Would I improve (even a little) the throghput performance increasing the
number of ACKs?
- From the Second set of packets
Frame n.2748 is retrasmitted in frame 2773, but the receiver should have
received it! and no acks were lost since the receiver is always sending acks
as it hadn't received it. I was capturing on the receiver side with a hub.
Am I missing something?
-Finally, a question on Best Practice:
Given, Throughput = W / RTT, no packet loss and no other bottlenecks.
Solving for RTT, which is the best practice to impose a maximum network
delay requirements?
Thanks again
Riccardo
#First Set
1828 0.004.569 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409292574 LEN=1460 WIN=8011
1829 0.001.228 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409294034 LEN=1460 WIN=8011
1830 0.003.789 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409295494 LEN=1460 WIN=8011
1831 0.001.232 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409296954 LEN=1460 WIN=8011
1832 0.003.892 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409298414 LEN=1460 WIN=8011
1833 0.001.226 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409299874 LEN=1460 WIN=8011
1834 0.001.231 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409301334 LEN=1460 WIN=8011
1835 0.002.396 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409302794 LEN=1460 WIN=8011
1836 0.000.668 [S] [R] D=8181 S=32939 ACK=409304254
WIN=48180
1837 0.004.454 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409304254 LEN=1460 WIN=8011
1838 0.001.229 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409305714 LEN=1460 WIN=8011
1839 0.003.627 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409307174 LEN=1460 WIN=8011
1840 0.010.096 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409308634 LEN=1460 WIN=8011
1841 0.000.579 [S] [R] D=8181 S=32939 ACK=409310094
WIN=48180
1842 0.004.488 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409310094 LEN=1460 WIN=8011
1843 0.001.228 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409311554 LEN=1460 WIN=8011
1844 0.003.699 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409313014 LEN=1460 WIN=8011
1845 0.001.229 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409314474 LEN=1460 WIN=8011
1846 0.003.901 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409315934 LEN=1460 WIN=8011
1847 0.001.228 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409317394 LEN=1460 WIN=8011
1848 0.001.231 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409318854 LEN=1460 WIN=8011
1849 0.002.333 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409320314 LEN=1460 WIN=8011
1850 0.000.437 [S] [R] D=8181 S=32939 ACK=409321774
WIN=48180
1851 0.004.741 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409321774 LEN=1460 WIN=8011
1852 0.001.227 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409323234 LEN=1460 WIN=8011
1853 0.003.663 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409324694 LEN=1460 WIN=8011
1854 0.010.052 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409326154 LEN=1460 WIN=8011
1855 0.000.260 [S] [R] D=8181 S=32939 ACK=409327614
WIN=48180
1856 0.004.807 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409327614 LEN=1460 WIN=8011
1857 0.001.228 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409329074 LEN=1460 WIN=8011
1858 0.004.032 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409330534 LEN=1460 WIN=8011
1859 0.001.230 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409331994 LEN=1460 WIN=8011
1860 0.001.230 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409333454 LEN=1460 WIN=8011
1861 0.002.358 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409334914 LEN=1460 WIN=8011
1862 0.001.227 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409336374 LEN=1460 WIN=8011
1863 0.003.631 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409337834 LEN=1460 WIN=8011
1864 0.000.303 [S] [R] D=8181 S=32939 ACK=409339294
WIN=48180
1865 0.004.860 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409339294 LEN=1460 WIN=8011
1866 0.001.229 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409340754 LEN=1460 WIN=8011
1867 0.003.639 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409342214 LEN=1460 WIN=8011
1868 0.010.131 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409343674 LEN=1460 WIN=8011
1869 0.000.134 [S] [R] D=8181 S=32939 ACK=409345134
WIN=48180
1870 0.004.964 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409345134 LEN=1460 WIN=8011
1871 0.001.217 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409346594 LEN=1460 WIN=8011
1872 0.001.231 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409348054 LEN=1460 WIN=8011
1873 0.002.468 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409349514 LEN=1460 WIN=8011
1874 0.001.231 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409350974 LEN=1460 WIN=8011
1875 0.003.862 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409352434 LEN=1460 WIN=8011
1876 0.001.226 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409353894 LEN=1460 WIN=8011
1877 0.003.597 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409355354 LEN=1460 WIN=8011
1878 0.000.245 [S] [R] D=8181 S=32939 ACK=409356814
WIN=48180
1879 0.004.945 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409356814 LEN=1460 WIN=8011
1880 0.001.230 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409358274 LEN=1460 WIN=8011
1881 0.003.616 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409359734 LEN=1460 WIN=8011
1882 0.010.112 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409361194 LEN=1460 WIN=8011
1883 0.000.073 [S] [R] D=8181 S=32939 ACK=409361194
WIN=48180
1884 0.004.982 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409362654 LEN=1460 WIN=8011
1885 0.001.230 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409364114 LEN=1460 WIN=8011
1886 0.003.930 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409365574 LEN=1460 WIN=8011
1887 0.001.231 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409367034 LEN=1460 WIN=8011
1888 0.001.230 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409368494 LEN=1460 WIN=8011
1889 0.002.559 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409369954 LEN=1460 WIN=8011
1890 0.001.229 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409371414 LEN=1460 WIN=8011
1891 0.003.610 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409372874 LEN=1460 WIN=8011
1892 0.000.057 [S] [R] D=8181 S=32939 ACK=409372874
WIN=48180
1893 0.005.375 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409374334 LEN=1460 WIN=8011
1894 0.001.230 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409375794 LEN=1460 WIN=8011
1895 0.013.492 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409377254 LEN=1460 WIN=8011
1896 0.000.070 [S] [R] D=8181 S=32939 ACK=409377254
WIN=48180
1897 0.001.156 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409378714 LEN=1460 WIN=8011
1898 0.003.790 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409380174 LEN=1460 WIN=8011
1899 0.001.227 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409381634 LEN=1460 WIN=8011
1900 0.003.699 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409383094 LEN=1460 WIN=8011
1901 0.001.229 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409384554 LEN=1460 WIN=8011
1902 0.003.880 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409386014 LEN=1460 WIN=8011
1903 0.001.229 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409387474 LEN=1460 WIN=8011
1904 0.003.670 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409388934 LEN=1460 WIN=8011
1905 0.000.056 [S] [R] D=8181 S=32939 ACK=409388934
WIN=48180
1906 0.001.175 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409390394 LEN=1460 WIN=8011
1907 0.003.873 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409391854 LEN=1460 WIN=8011
1908 0.001.229 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409393314 LEN=1460 WIN=8011
1909 0.013.515 [S] [R] D=8181 S=32939 ACK=409394774
WIN=48180
1910 0.000.287 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409394774 LEN=1460 WIN=8011
1911 0.004.967 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409396234 LEN=1460 WIN=8011
1912 0.001.232 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409397694 LEN=1460 WIN=8011
1913 0.003.825 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409399154 LEN=1460 WIN=8011
1914 0.001.231 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409400614 LEN=1460 WIN=8011
1915 0.003.850 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409402074 LEN=1460 WIN=8011
1916 0.001.231 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409403534 LEN=1460 WIN=8011
1917 0.003.421 [S] [R] D=8181 S=32939 ACK=409404994
WIN=48180
1918 0.000.199 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409404994 LEN=1460 WIN=8011
1919 0.001.229 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409406454 LEN=1460 WIN=8011
1920 0.003.948 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409407914 LEN=1460 WIN=8011
1921 0.001.221 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409409374 LEN=1460 WIN=8011
1922 0.003.741 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409410834 LEN=1460 WIN=8011
1923 0.009.686 [S] [R] D=8181 S=32939 ACK=409412294
WIN=48180
1924 0.000.368 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409412294 LEN=1460 WIN=8011
1925 0.005.070 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409413754 LEN=1460 WIN=8011
1926 0.001.227 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409415214 LEN=1460 WIN=8011
1927 0.003.798 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409416674 LEN=1460 WIN=8011
1928 0.001.230 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409418134 LEN=1460 WIN=8011
1929 0.001.268 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409419594 LEN=1460 WIN=8011
1930 0.002.535 [R] [S] D=32939 S=8181 ACK=3695848294
SEQ=409421054 LEN=1460 WIN=8011
#Second Set
2742 0.000.698 [S] [R] TCP D=8181 S=32939
ACK=410375894 WIN=48180
2743 0.004.511 [R] [S] TCP D=32939 S=8181
ACK=3695848294 SEQ=410375894 LEN=1460 WIN=8011
2744 0.001.227 [R] [S] TCP D=32939 S=8181
ACK=3695848294 SEQ=410377354 LEN=1460 WIN=8011
2745 0.003.814 [R] [S] TCP D=32939 S=8181
ACK=3695848294 SEQ=410378814 LEN=1460 WIN=8011
2746 0.001.232 [R] [S] TCP D=32939 S=8181
ACK=3695848294 SEQ=410380274 LEN=1460 WIN=8011
2747 0.001.214 [R] [S] TCP D=32939 S=8181
ACK=3695848294 SEQ=410381734 LEN=1460 WIN=8011
2748 0.002.559 [R] [S] TCP D=32939 S=8181
ACK=3695848294 SEQ=410383194 LEN=1428 WIN=8011
2749 0.004.897 [R] [S] TCP D=32939 S=8181
ACK=3695848294 SEQ=410384654 LEN=1460 WIN=8011
2750 0.000.069 [S] [R] TCP D=8181 S=32939
ACK=410383194 WIN=45260
2751 0.005.068 [R] [S] TCP D=32939 S=8181
ACK=3695848294 SEQ=410386114 LEN=1460 WIN=8011
2752 0.000.109 [S] [R] TCP D=8181 S=32939
ACK=410383194 WIN=47450
2753 0.001.120 [R] [S] TCP D=32939 S=8181
ACK=3695848294 SEQ=410387574 LEN=1460 WIN=8011
2754 0.000.060 [S] [R] TCP D=8181 S=32939
ACK=410383194 WIN=47450
2755 0.003.771 [R] [S] TCP D=32939 S=8181
ACK=3695848294 SEQ=410389034 LEN=1460 WIN=8011
2756 0.000.067 [S] [R] TCP D=8181 S=32939
ACK=410383194 WIN=47450
2757 0.001.162 [R] [S] TCP D=32939 S=8181
ACK=3695848294 SEQ=410390494 LEN=1460 WIN=8011
2758 0.000.057 [S] [R] TCP D=8181 S=32939
ACK=410383194 WIN=47450
2759 0.001.172 [R] [S] TCP D=32939 S=8181
ACK=3695848294 SEQ=410391954 LEN=1460 WIN=8011
2760 0.000.061 [S] [R] TCP D=8181 S=32939
ACK=410383194 WIN=47450
2761 0.002.531 [R] [S] TCP D=32939 S=8181
ACK=3695848294 SEQ=410393414 LEN=1460 WIN=8011
2762 0.000.059 [S] [R] TCP D=8181 S=32939
ACK=410383194 WIN=47450
2763 0.004.857 [R] [S] TCP D=32939 S=8181
ACK=3695848294 SEQ=410394874 LEN=1460 WIN=8011
2764 0.000.076 [S] [R] TCP D=8181 S=32939
ACK=410383194 WIN=47450
2765 0.005.101 [R] [S] TCP D=32939 S=8181
ACK=3695848294 SEQ=410396334 LEN=1460 WIN=8011
2766 0.000.060 [S] [R] TCP D=8181 S=32939
ACK=410383194 WIN=47450
2767 0.001.168 [R] [S] TCP D=32939 S=8181
ACK=3695848294 SEQ=410397794 LEN=1460 WIN=8011
2768 0.000.061 [S] [R] TCP D=8181 S=32939
ACK=410383194 WIN=47450
2769 0.003.620 [R] [S] TCP D=32939 S=8181
ACK=3695848294 SEQ=410399254 LEN=1460 WIN=8011
2770 0.000.074 [S] [R] TCP D=8181 S=32939
ACK=410383194 WIN=47450
2771 0.001.157 [R] [S] TCP D=32939 S=8181
ACK=3695848294 SEQ=410400714 LEN=1460 WIN=8011
2772 0.000.058 [S] [R] TCP D=8181 S=32939
ACK=410383194 WIN=47450
2773 0.003.807 [R] [S] TCP D=32939 S=8181
ACK=3695848294 SEQ=410383194 LEN=1460 WIN=8011
2774 0.000.058 [S] [R] TCP D=8181 S=32939
ACK=410402174 WIN=40150
2775 0.015.004 [R] [S] TCP D=32939 S=8181
ACK=3695848294 SEQ=410402174 LEN=1460 WIN=8011
2776 0.000.168 [S] [R] TCP D=8181 S=32939
ACK=410403634 WIN=48180
2777 0.001.056 [R] [S] TCP D=32939 S=8181
ACK=3695848294 SEQ=410403634 LEN=1460 WIN=8011
2778 0.000.060 [S] [R] TCP D=8181 S=32939
ACK=410405094 WIN=47450
2779 0.003.714 [R] [S] TCP D=32939 S=8181
ACK=3695848294 SEQ=410405094 LEN=1460 WIN=8011
2780 0.000.060 [S] [R] TCP D=8181 S=32939
ACK=410406554 WIN=46720
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