You Tube

Dub45 · #1 1st August, 12:39 AM

Some recently asked about You Tube problems and I am not sure if the post was answered so here I am asking again - whats happening or should I say not happening with You Tube? For example:

http://youtube.com/watch?v=Z9zDFTKc34s

has been stalling on me for the last God knows how long so far I have had two bursts of two seconds ops just got another few seconds there...

My irishisp test tells me I am getting my full 3Mbps so what's the story with You Tube?

stef · #2 1st August, 11:27 AM

I have been experiencing the same problem. It's definitely not a problem with your connection anyway.

JANER · #3 1st August, 12:32 PM

running slow here too but my own youtube vids such as
http://www.youtube.com/watch?v=rYEGlV7BsIA
are fine, I will admit utube are slower then other sites though

TimTim · #4 2nd August, 10:58 AM

I've been having youtube issues occasionally but I'm not on a smart connection. I think its a case of they are running out of bandwidth on their side.

Dub45 · #5 2nd August, 06:12 PM

Quote:

Originally Posted by TimTim

I've been having youtube issues occasionally but I'm not on a smart connection. I think its a case of they are running out of bandwidth on their side.

It is odd though that some videos seem to run perfectly while others are impossible to get going.

Someone mentioned somewhere recently (maybe in a post on boards?) that youtube now had servers in Ireland - maybe the ones that are running ok are on these servers?

stef · #6 2nd August, 07:39 PM

I don't think that is the case. I've tried ie.youtube.com, fr.youtube.com, pl.youtube.com etc etc. They are all very low speed over the last few days. Even the pages are taking time to load. I know google are running their antipiracy software on the servers at the moment but I don't see how that could affect the speed. Probably some bottleneck somewhere but it's strange it affects all their sites no matter where they are hosted.

Update:

All the urls point to the same servers.

Code:

qazzy:~ stefan$ host youtube.com
youtube.com has address 208.65.153.253
youtube.com has address 208.65.153.238
youtube.com has address 208.65.153.251
youtube.com mail is handled by 10 sjl-mbox1.sjl.youtube.com.
qazzy:~ stefan$ host ie.youtube.com
ie.youtube.com has address 208.65.153.253
ie.youtube.com has address 208.65.153.251
qazzy:~ stefan$ host uk.youtube.com
uk.youtube.com has address 208.65.153.253
uk.youtube.com has address 208.65.153.251
qazzy:~ stefan$ host pl.youtube.com
pl.youtube.com has address 208.65.153.253
pl.youtube.com has address 208.65.153.251

There seems to be a big bottleneck between hops 9 and 14:

Code:

traceroute: Warning: youtube.com has multiple addresses; using 208.65.153.253
traceroute to youtube.com (208.65.153.253), 64 hops max, 40 byte packets
 1  84-203-32-1.mysmart.ie (84.203.32.1)  14.082 ms  13.699 ms  12.855 ms
 2  ge0-0-0.core1.tcy.dub.stisp.net (84.203.130.125)  14.463 ms  13.227 ms  13.546 ms
 3  195.66.224.185 (195.66.224.185)  24.826 ms  25.287 ms  24.934 ms
 4  t4-3.mpd03.jfk02.atlas.cogentco.com (130.117.1.105)  105.756 ms  106.837 ms  105.381 ms
 5  t7-1.mpd01.dca01.atlas.cogentco.com (154.54.5.246)  106.983 ms  101.535 ms  101.846 ms
 6  v3498.mpd01.dca02.atlas.cogentco.com (154.54.7.6)  105.143 ms  105.098 ms  104.900 ms
 7  t1-4.mpd01.iad01.atlas.cogentco.com (154.54.7.162)  99.334 ms  99.377 ms  99.384 ms
 8  youtube.demarc.cogentco.com (38.112.2.142)  98.746 ms  99.088 ms  98.236 ms
 9  10.33.112.21 (10.33.112.21)  98.009 ms  98.218 ms  98.762 ms
10  * * *
11  208.65.154.9 (208.65.154.9)  164.965 ms  221.783 ms *
12  * * *
13  * * *
14  208.65.153.253 (208.65.153.253)  179.614 ms  179.566 ms  178.584 ms

Anyways I am sure it will sort itself out eventually :P

EJay · #7 2nd August, 10:40 PM

Those hops are all within YouTubes own Network.

Ejay.

Arithon · #8 5th August, 02:05 AM

I've been seeing problems connecting to more sites than just YouTube, store.apple.com is slow too.

Let's start with just the root HTML page for YouTube:

Code:

$ curl -o /dev/null  http://www.youtube.com/
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 74968  100 74968    0     0   4407      0  0:00:17  0:00:17 --:--:--  5380

Nasty speed there... but maybe my line is bad? I have a 100MB file hosted in Germany, try downloading that:

Code:

$ curl -o /dev/null  http://www.lyranthe.org/file.bin
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  3  100M    3 3705k    0     0   356k      0  0:04:47  0:00:10  0:04:37  398k^C

So basically, getting 400K download speeds from a European server, 5K download speeds from YouTube.

Traceroutes are:

Code:

$ traceroute www.youtube.com
traceroute: Warning: www.youtube.com has multiple addresses; using 208.65.153.238
traceroute to www.youtube.com (208.65.153.238), 64 hops max, 40 byte packets
 1  192.168.1.1 (192.168.1.1)  1.731 ms  1.253 ms  1.224 ms
 2  84-203-32-1.mysmart.ie (84.203.32.1)  30.591 ms  30.617 ms  30.551 ms
 3  ge0-0-0.core1.tcy.dub.stisp.net (84.203.130.125)  29.623 ms  31.864 ms  27.553 ms
 4  195.66.224.185 (195.66.224.185)  42.600 ms  41.573 ms  38.268 ms
 5  t4-1.mpd03.jfk02.atlas.cogentco.com (154.54.5.122)  125.890 ms  126.931 ms  127.974 ms
 6  t7-1.mpd01.dca01.atlas.cogentco.com (154.54.5.246)  131.600 ms  120.141 ms  122.334 ms
 7  v3493.mpd01.dca02.atlas.cogentco.com (154.54.7.2)  126.124 ms  126.229 ms  127.556 ms
 8  t1-4.mpd01.iad01.atlas.cogentco.com (154.54.7.162)  124.120 ms  121.462 ms  123.148 ms
 9  youtube.demarc.cogentco.com (38.112.2.142)  119.606 ms  119.276 ms  121.908 ms
10  10.33.112.21 (10.33.112.21)  120.190 ms  121.258 ms  122.072 ms
11  * * *
12  208.65.154.5 (208.65.154.5)  185.856 ms * *

Code:

$ traceroute www.lyranthe.org
traceroute to arithon.lyranthe.org (88.198.22.245), 64 hops max, 40 byte packets
 1  192.168.1.1 (192.168.1.1)  3.821 ms  1.243 ms  1.204 ms
 2  84-203-32-1.mysmart.ie (84.203.32.1)  29.844 ms  30.209 ms  76.466 ms
 3  ge0-0-0.core1.tcy.dub.stisp.net (84.203.130.125)  29.857 ms  30.169 ms  30.313 ms
 4  g9-10.mpd01.lon01.atlas.cogentco.com (149.6.80.253)  40.901 ms  38.688 ms  41.091 ms
 5  t2-1.mpd02.lon01.atlas.cogentco.com (130.117.2.18)  42.277 ms  39.079 ms  41.063 ms
 6  p3-2.mpd01.ams03.atlas.cogentco.com (130.117.1.169)  49.861 ms  50.750 ms  49.456 ms
 7  t2-2.mpd02.fra03.atlas.cogentco.com (130.117.2.142)  57.656 ms  55.415 ms  55.898 ms
 8  gec1-rt1-ffm2.core.noris.net (80.81.192.88)  56.482 ms  57.425 ms  55.624 ms
 9  vl604-rt3-nbg3.core.noris.net (213.95.0.197)  60.895 ms  60.380 ms  58.664 ms
10  hetzner-gw.noris.net (213.133.96.25)  58.415 ms  59.512 ms  58.862 ms
11  hos-bb1.juniper1.rz4.hetzner.de (213.239.240.200)  60.497 ms  74.064 ms  62.853 ms
12  et.2.16.rs3k8.rz5.hetzner.de (213.239.244.103)  58.995 ms  58.863 ms  61.402 ms
13  arithon.lyranthe.org (88.198.22.245)  61.023 ms  60.572 ms  58.743 ms

Trying from that European server to YouTube:

Code:

$ curl -o /dev/null http://www.youtube.com/
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 75112  100 75112    0     0  51234      0  0:00:01  0:00:01 --:--:--  143k

Code:

$ traceroute www.youtube.com
traceroute: Warning: www.youtube.com has multiple addresses; using 208.65.153.238
traceroute to www.youtube.com (208.65.153.238), 30 hops max, 52 byte packets
 1  static.88-198-22-225.clients.your-server.de (88.198.22.225)  0.320 ms  0.284 ms  0.304 ms
 2  hos-tr4.juniper3.rz4.hetzner.de (213.239.244.193)  0.823 ms  0.481 ms  0.331 ms
 3  hos-bb1.juniper3.s02.hetzner.de (213.239.240.195)  0.549 ms  0.481 ms  0.482 ms
 4  noris-gw.hetzner.de (213.133.96.26)  0.628 ms  0.673 ms  0.631 ms
 5  vl604-rt1-ffm2.core.noris.net (213.95.0.198)  3.854 ms  3.606 ms  3.752 ms
 6  decix.mpd01.fra03.atlas.cogentco.com (80.81.192.63)  4.081 ms  3.991 ms  3.932 ms
 7  t7-2.mpd01.par02.atlas.cogentco.com (130.117.0.102)  95.217 ms  95.310 ms  95.112 ms
 8  t3-2.mpd02.par01.atlas.cogentco.com (130.117.2.110)  97.352 ms  97.476 ms  97.288 ms
 9  t8-4.mpd01.dca01.atlas.cogentco.com (130.117.2.102)  97.766 ms  97.580 ms  97.642 ms
10  t8-3.mpd01.dca02.atlas.cogentco.com (154.54.6.198)  96.972 ms  97.022 ms  96.901 ms
11  t2-4.mpd01.iad01.atlas.cogentco.com (154.54.2.50)  97.471 ms  97.258 ms  97.221 ms
12  youtube.demarc.cogentco.com (38.112.2.142)  101.617 ms  101.576 ms  101.504 ms
13  *

I checked from a work machine to youtube.com as well - the connection goes via LINX, and no problems seen there.

Other sites with problems:
http://store.apple.com/Apple/WebObjects/irlstore

By problems, I mean that I get ~5-10K download speeds from home when downloading the specified webpage, but 110K+ from two different networks that I have access to.
Download rates do vary - the Apple store page takes between 2-10 seconds to download with curl, and consistently under a second from work.

Running ethereal/wireshark, there are a large number of TCP Dup ACKs and some TCP retransmissions. I've tried lowering the MTU on my local machine, to verify that PMTUD wasn't broken.

I'd guess that there might be some packet loss on a peering link, but I could be completely wrong

stef · #9 6th August, 04:29 PM

I've also noticed podcasts from itunes are downloading ridiculously slowly. Around 5kb/s. Apart from youtube and apple my speeds are great.
As a previous poster mentioned, from work youtube is fast as ever.
Youtube I can live without but I like my podcasts =/

barthek · #10 6th August, 09:38 PM

I'd say it is generally a problem with link Smart use to the US.
Youtube, apple, ebay you name it...

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