[BitTorrent] Re: TCP vs. UDP

Olaf van der Spek OvdSpek at LIACS.NL
Tue Mar 22 14:58:38 EST 2005


larytet wrote:
> 
> 20% of peers has connection with latency above 300ms
> Another problem is geographical location of peers. Peers tend to
> establish connections randomly creating unnecessary burden for ISPs.
> 
> from the article:"Our interest in latencies of the peers is due to the
> well known feature of TCP congestion control which discriminates
> against flows with large round-trip times.
> This, coupled with the fact that the average size of files exchanged is
> in the order of 2-4 MB, makes latency a
> very important consideration when selecting amongst multiple peers
> sharing the same file."
> 
> Amazingly there are peers with 1s latency and more. Clearly these are
> peers behind dial ups with large TCP packets in downstream queue
> waiting for delivery.
> 
> The article contains lot of usefull statistics. I thought that there
> are people who did not read it and would be interested in reading it.

That's certainly true, but I couldn't find the TCP vs UDP bit.

> --- In BitTorrent at yahoogroups.com, Olaf van der Spek <OvdSpek at L...> wrote:
> 
>>larytet wrote:
>>
>>>this article is interesting
>>
>>Where does it discuss TCP vs UDP?
>>And how is the article relevent to BT?
>>
>>
>>>http://www.utsc.utoronto.ca/~rosselet/cscd58/ref05/p2p-measure.pdf
>>>related to Napster/Gnutella, some measurements of connection latency
>>>and available bandwidth. 
>>>
>>>
>>>
>>>
>>>
>>> 
>>>Yahoo! Groups Links
>>>
>>>
>>>
>>> 
>>>
>>>
>>
>>
>>-- 
>>Olaf van der Spek
>>http://xccu.sf.net/
> 
> 
> 
> 
> 
> 
>  
> Yahoo! Groups Links
> 
> 
> 
>  
> 
> 


-- 
Olaf van der Spek
http://xccu.sf.net/


 
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