I’ve published my results here.
http://www.digitalsociety.org/2009/11/analysis-of-bittorrent-utp-congestion-avoidance/
Dr. Reed. Your use of the words “rhetoric”
and “tricks” aren’t very useful to this discussion, and I
would take issue with your comments.
1.
BitTorrent
still hogs over 90% of my broadband connection
over HTTP. This has significant ramifications beyond just real-time
applications like VoIP and online gaming.
2.
You
shouldn’t be so quick to discount VoIP and online
gamers. A very large number of BitTorrent (or any P2P app) users also
do
online gaming and VoIP, and they’re forced to shut down their P2P
application when the use VoIP or game and that actually hurts the P2P
upload
and download throughput for the entire P2P community since there are
fewer
seeders.
3.
Don’t
conflate wireless with wired broadband. Just
because 150 ms ping for wireless is best case doesn’t make 70 ms
additional
on a wired network bearable for online gaming. Maybe you’re
different, but I don’t know any gamer that will put up with an
additional
70 ms if they can help it. I thought it would be tolerable for VoIP,
but
my Lingo VoIP phone service drops a significant amount of audio even
when I merely
upload with BitTorrent.
George
Ou
I find the word games/rhetorical tricks that Ou
and Bennett
use fascinating. We'll see whether Farber posts my response below.
George Ou wrote:
Subject: RE: [
NNSquad ]
BitTorrent uTorrent 2.0 uTP will self-throttle to protect
networks
Too bad nobody ever bothered to test if these claims actually hold
water
before repeating them endlessly. I just tested uTorrent version 2
build
16850 today and it still grabs all the bandwidth and jacks up the ping
to
unbearable levels for online gaming and VoIP. It certainly does NOT
protect
my network.
I
will do some testing myself, because I am curious about the mechanism
in
uTorrent 2.0. I do note that "unbearable levels for online
gaming and VoIP" is an interesting statement.
If true that means that ping times might be 100 msec or more. Now,
since I have been recently measuring ping times on networks where there
are no
"uTorrent" or other P2P services running, I can tell you that on a
variety of commercial providers, 150 msec. ping times are common - and
on ATT
3G in several cities, there are stable ping times that can be measured
that are
on the order of 2000-5000 msec.
So the "data" presented by Mr. Ou represents a very, very interesting
choice of phrase. Say that it is "unbearable" for two of
the most sensitive-to-latency applications (only).
I would, myself, stick to scientific measurements: how many
milliseconds? Clearly he has measured that data. But I
presume the hope of a talented columnist is to get the word
"unbearable" to stick in the mind, and leave the "bumper
sticker" impression without the qualifying information.
Rhetorical trickery? You be the judge. I'm gonna report
numbers.