[Should we limit the cross posting? I believe sending this thread to 4
mailing lists is too much
(may be this is because I am subscribed to all four)]
Hi,
here is some feeback based on what we did in [Le Blond].
section 3
We show that we can achieve much higher savings than 80% of reduction.
The direct implication of this
result is that you can still achieve significant savings with few peers
per ISP (per torrent).
section 4
we explain the relation between peers download completion time and
network congestion.
With large enough network congestion you can significantly improve the
peers download completion time.
Therefore, it is likely that the different gains shown by field
experiments report different level of congestion
of the underlying network during the experiments.
section 8.1
you write that we did simulations. We did not, we did experiments with
real BitTorrent clients.
section 8.2
it is not clear what you mean in "as shown in [Le Blond], the right
balance of randomness and
locality depends on the P2P algorithm". We did not explore several P2P
protocols, but only BitTorrent.
We show that BT is extremely robust to high locality (as long as there
is enough randomness within each ISP).
We cannot conclude for any other P2P protocol.
"On the other hand, P2P systems not adopting the tit-for-tat approach
(e.g. the eDonkey network) should not be damaged by locality-based"
It is not clear to me. Peer selection (tit-for-tat like choking algo in
BT) is not the only one factor of efficiency, there is also piece
diversity.
Edonkey/emule also use rarest first (but a less efficient peer selection
algorithm). Therefore, as locality adversely impact
piece diversity, my bet is that Edonkey/emule will suffer from locality.
Regards,
Arnaud.
Enrico Marocco wrote:
Hello folks,
we have just submitted a draft that tries to summarize many discussions
about possible effects (and side-effects) of P2P traffic localization:
http://www.ietf.org/internet-drafts/draft-marocco-p2prg-mythbustering-00.txt
The document is very early and the conclusions may be controversial; any
comments, feedback and contributions to improve it will be greatly
appreciated.
Apologies for cross-posting, I'm sending this email to all the lists
where some of the discussions happened; please consider addressing any
follow-up to p2prg only.
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Arnaud Legout, Ph.D.
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