Re: Canadian mirror ftp3.nrc.ca - throughput issues
PMJI, just having a looksee with these numbers...comments below (I'm not
on debian-mirrors, though I thought I was at one point...hm..) Also I'm
not really aware that there is actually anything going on wrong or right,
so I'm really jumping in blind.
On Fri, 9 Jan 2009, Simon Valiquette wrote:
Adam Majer un jour écrivit:
132.246.2.23 - ftp3.nrc.ca
This mirror is included as part of ftp.ca.debian.org
The connection through telus seems very slow,
14 nrc-gi-1-7.nrnet2.nrc.ca (132.246.4.133) 55.036 ms * *
15 ftp3.nrc.ca (132.246.2.23) 56.391 ms nrc-gi-1-7.nrnet2.nrc.ca
(132.246.4.133) 57.157 ms ftp3.nrc.ca (132.246.2.23) 56.539 ms
Looks like you're going through our NRNet II pipe, which is a 1Gb/s
backbone from Victoria right to Ottawa. Big and clean, but that latency,
well I can't change the speed of light cap'n.
While connection through allstream is full speed,
AFAIK, Allstream is very well connected with most (if not all) main
canadians networks while the connectivity from Cogent with both Ca*NET and
Videotron seems to be quite bad.
Bell has the best Candian connectivity from where we sit, followed by
Shaw. For American peering, it's Cogent and Allstream followed by Shaw.
I made some quick testing with my mirrors and others places, and it seems
that Congent either have some problems or have a much poorer connectivity
with canadians networks than Allstream.
Possible.
That said, there might be some other problems on NRC side as well. Here are
some bandwidth tests I have made.
From my mirror to NRC (gulus.USherbrooke.ca)
NRC => 1500 K/s
I'm not sure it's a fair test! You're connected to the CANARIE network,
which my server (10Gb/s connected) is also connected to. So it never
touches the Internet.
Could be faster, but it seems reasonnable.
From Videotron to NRC:
gulus => 1050 K/s (about the bandwidth I have from Videotron)
NRC => 40 K/s (????)
Videotron is welcome to peer to the Ottawa Internet Exchange where we also
have a 1Gb/s connection.
What is going on? My packets are going from Videotron to an internet node
on CA*Net (the best route), then move to bell.ca to go back to NRC in 17
hops, while my mirror connect to it directly using CA*Net in 7 hops.
OK, sorry, I think there's confusion here.
CA*Net = Bell
CA*Net 4 = CANARIE.
Now, are you saying that we can't reach U Sherbrooke via CA*Net 4?
ftp 341# traceroute gulus.USherbrooke.ca
traceroute to gulus.USherbrooke.ca (206.167.141.10), 30 hops max, 40 byte packets
1 nrcgate-vl503 (132.246.2.17) 0.289 ms 0.193 ms 0.262 ms
2 c4-tor01.canet4.net (198.32.149.12) 6.669 ms 5.278 ms 5.279 ms
3 c4-mon01.canet4.net (205.189.32.18) 29.696 ms 29.673 ms 30.083 ms
4 c4-risq.canet4.net (205.189.32.225) 39.862 ms 29.671 ms 29.597 ms
5 c4-dum.risq.net (132.202.80.49) 29.823 ms 29.858 ms 29.772 ms
6 v3351-colo625.risq.net (132.202.36.18) 30.044 ms 30.004 ms 29.988 ms
7 gulus.usherbrooke.ca (206.167.141.10) 30.059 ms 29.965 ms 30.085 ms
ftp 342#
Trying a random user connected to ftp.nrc.ca right now from Videotron:
ftp 342# traceroute modemcable090.26-70-69.static.videotron.ca
traceroute to modemcable090.26-70-69.static.videotron.ca (69.70.26.90), 30
hops max, 40 byte packets
1 nrcgate-vl503 (132.246.2.17) 0.280 ms 0.191 ms 0.233 ms
2 intgate-fa-0-0 (132.246.0.225) 0.266 ms 0.269 ms 0.196 ms
3 66.46.210.213 (66.46.210.213) 1.359 ms 1.391 ms 1.379 ms
4 ge0-1-3-1.cipc1-mtl.bb.allstream.net (199.212.161.194) 4.090 ms 3.812 ms 3.858 ms
5 216.191.190.30 (216.191.190.30) 4.092 ms 10.026 ms 4.082 ms
6 ia-cnnu-bb04-ge6-1-0-cpe022.vtl.net (216.113.122.22) 5.583 ms 7.318 ms 4.368 ms
7 24.200.250.85 (24.200.250.85) 5.125 ms 4.513 ms 4.746 ms
8 24.200.227.42 (24.200.227.42) 5.275 ms 4.833 ms 4.967 ms
9 modemcable233.8-130-66.mc.videotron.ca (66.130.8.233) 13.061 ms 11.283 ms 10.950 ms
10 modemcable090.26-70-69.static.videotron.ca (69.70.26.90) 11.645 ms 12.169 ms 11.997 ms
ftp 343#
So it looks like Allstream peers with Videotron in Montreal. 4ms... that
looks right. Deeper in, can't speak to the cable modem's latency.
Looks like to me that there is a routing problem somewhere.
Maybe we should exchange traceroute? There's also a looking glass router
here:
telnet://nrc-rv.nrc.ca/
You can try that.
I don't know what is going on. Maybe it is cogent, but this has been the
problem for *months* now.
I'll see if there are archives for this discussion, but I haven't heard of
any problems.
Also, note that we very recently turned up connectivity to the Toronto
Internet Exchange, so this will also influence connectivity.
wfms
Reply to: