[Novalug] Low Internet throughput can have many, different causes

Paul D. Bain paulbain@pobox.com
Mon Oct 26 18:28:11 EDT 2009


covici@ccs.covici.com wrote:
> But the strange thing is that I have seen where there is very little
> packet loss and yet low throughput.  That is why I was looking for a way
> to tell who is doing what to whom.

	AFAIK, low throughput can result from many factors, of which packet 
loss is but one. For example, low throughput can result from, say, 
network congestion or high latency (HL), and HL can result from 
geographic distance, as Aaron Porter has suggested. Relatedly, see this:

http://www.caida.org/publications/presentations/Myths2001/mgp00025.html


> Paul D. Bain <paulbain@pobox.com> wrote:
> 
>> covici@ccs.covici.com wrote:
>>> OK, these are using mtr, first here is the verizon.
>>>                                        Packets               Pings
>>>  Host                                Loss%   Snt   Last   Avg  Best
>>>                                        Wrst StDev
>>>  1. 66.135.63.3                       0.0%    50    0.3   0.3   0.3
>>>                                        0.8   0.1
>>>  2. 216.187.124.101                   0.0%    50    0.3   0.5   0.3
>>>                                        8.4   1.1
>>>  3. 216.187.124.226                   0.0%    50    0.3   0.6   0.3
>>>                                        12.6   1.7
>>>  4. 10ge-ten1-3.dal-eqx-cor-2.peer1.  0.0%    50    7.6  22.5   7.6
>>>                                        201.0  50.9
>>>  5. ge-1-1-0.dal33.ip4.tinet.net      0.0%    50    7.7   8.0   7.6
>>>                                        16.3   1.4
>>>  6. xe-8-2-0.nyc30.ip4.tinet.net      0.0%    50   55.6  59.1  55.5
>>>                                        120.0  12.0
>>>  7. sl-gw35-nyc-3-0-2.sprintlink.net  0.0%    50   55.6  55.7  55.5
>>>                                        56.4   0.2
>>>  8. sl-crs2-nyc-0-10-2-0.sprintlink.  0.0%    50   56.5  56.4  55.8
>>>                                        58.3   0.5
>>>  9. 144.232.18.238                   16.0%    50   51.7  52.0  51.2
>>>                                        65.8   2.2
>> 	Does this output denote __16%__ packet loss? Is that not very high?
>>
>>
>>> 10. 0.xe-5-1-0.XL3.NYC4.ALTER.NET     0.0%    50   51.5  60.7  51.2
>>>                                        160.6  24.1
>>> 11. 0.so-7-3-0.XT1.NYC8.ALTER.NET     0.0%    50   52.8  52.7  51.8
>>>                                        63.2   1.6
>>>     0.so-6-2-0.XT1.NYC9.ALTER.NET
>>> 12. 0.so-3-2-0.NY325-BB-RTR1.verizon 10.0%    50   52.6  53.1  52.0
>>>                                        69.0   2.5
>> 	Ten percent packet loss? Also a bit high.
>>
>>>     0.so-2-0-0.NY325-BB-RTR1.verizon-gni.net
>>> 13. so-4-0-0-0.NWRK-BB-RTR1.verizon-  0.0%    50   58.3  58.9  56.3
>>>                                        96.0   7.0
>>> 14. 130.81.17.108                     0.0%    50   56.3  57.6  54.6
>>>                                        106.9   8.2
>>> 15. P14-3.CLPPVA-LCR-01.verizon-gni.  0.0%    50   57.2  58.5  57.0
>>>                                        68.2   1.7
>>> 16. L1.CLPPVA-VFTTP-10.verizon-gni.n  0.0%    50   60.0  59.3  58.1
>>>                                        65.5   1.1
>>> 17. pool-71-171-100-78.clppva.fios.v  0.0%    50   64.4  63.8  61.9
>>>                                        65.6   0.9
>>>  And here is the one using DSL .
>>>                                                                                                                        Packets
>>>                                        Pings
>>>  Host
>>>                                        Loss%   Snt   Last   Avg  Best
>>>                                        Wrst StDev
>>>  1. 66.135.63.3
>>>                                        0.0%    50    0.3   0.9   0.3
> 




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