[bittorrent] New P2P protocols

Justin Cormack justin at street-vision.com
Sat Mar 26 08:06:43 EST 2005


On Fri, 2005-03-25 at 17:18 +0000, larytet.8708132 at bloglines.com wrote:
> "wrt over 64k sockets, I think you will have to keep at least as much
> information
> in userspace as a tcp socket does to do anything useful,"
> 
> if your data
> is stored on media providing random access you do not need retransmission
> windows, for example. 

You dont if you use something like Linux sendfile which sends direct
from media, or other OS equivalents. The kernel can do this optimisation
for you.

> time of establishing of connection can be reduced
> if we remove TCP handshake. 

Your application has a handshake too. Probably much larger.

> TCP performs poor on high latency connections
> with burst packet losses (think link between dial up in small town in India
> and cable modem in the US). 

So do most other protocols.

j





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