[Snap] Page loading lag / delay & less-than-great / inconsistant dns times.

Forums › 2degrees (including Slingshot, Orcon, Flip, Stuff Fibre, MyRepublic, 2talk and Vocus) › [Snap] Page loading lag / delay & less-than-great / inconsistant dns times.

sammcj

75 posts

Master Geek

#71771 16-Nov-2010 22:17

I've just moved to Snap from TCL and am having some weird page loading lag.

When I enter a URL or click bookmark on any of my computers there is about a 1 - 2 sec delay before the page starts loading.

I thought it was DNS but I'm not 100% sure.

My average DNS times from dig are between 55 - 80 msec, compared with a friend who is also on snap and gets around 4-10 msec resolve times.

My attenuation down is 11-12.
I am getting a 13Mbit connection.
The exchange is about 250 meters away.
I have had my house freshly re-wired and we have no telephones (naked DSL).
I've tried several ADSL2+ modems.
I've bypassed my PFsense router and plugged the modem directly into computers.
My DNS servers are set to the default 202.37.101.1 & .2

It's really frustrating!

Ragnor

8219 posts

Uber Geek

Trusted

#405608 16-Nov-2010 23:10

What sort of result does running http://code.google.com/p/namebench/ to compare the Snap DNS servers to others show?

sammcj

75 posts

Master Geek

#405618 16-Nov-2010 23:36

*slight correction I'm about 400M away from the exchange, connecting at 15mbit, but benchmarking at 13.

Ragnor

8219 posts

Uber Geek

Trusted

#405624 16-Nov-2010 23:51

Hmm did you have interleaving off on Telstraclear, maybe defaulted to on when you moved to Snap.

Check the modem stats in the admin ui, normally called "ADSL Mode" with value of Fast (Interleaving off) or Interleaved (On)

Interleaving is a "legacy" error correction system that increases latency quite a lot.

It's a setting on the ADSL profile for the port you're connected to, so you probably need to ring the helpdesk to get it turned off.

sammcj

75 posts

Master Geek

#405626 16-Nov-2010 23:55

Sorry, I should have said that I was on TCL cable, not ADSL.

When I joined snap, I chose to have interleaving turned off.

sammcj

75 posts

Master Geek

#405627 16-Nov-2010 23:57

detailed information:

According to a friend, Trellis is not on, it's a Dynalink bug. (for ex I can ping snap.net.nz and get 6-7ms)

Ragnor

8219 posts

Uber Geek

Trusted

#405632 17-Nov-2010 00:28

Certainly sounds like an odd issue, checked ping and tracert to their primary dns server for any weirdness?

tracert bender.snap.net.nz

ping bender.snap.net.nz -t

Ragnor

8219 posts

Uber Geek

Trusted

#405634 17-Nov-2010 00:31

Also try lowering the the MTU in the modem/router to 1478 instead of 1500 see if there is any difference.

Quic Broadband

Move to New Zealand's best fibre broadband service (affiliate link). Note that to use Quic Broadband you must be comfortable with configuring your own router.

sammcj

75 posts

Master Geek

#405636 17-Nov-2010 00:36

root@nas:~# tracepath bender.snap.net.nz
1: nas.local (192.168.1.250) 0.221ms pmtu 1500
1: router.local (192.168.1.2) 0.324ms
1: router.local (192.168.1.2) 0.345ms
2: 192.168.2.1 (192.168.2.1) 2.296ms
3: 68.16.69.111.dynamic.snap.net.nz (111.69.16.68) 27.477ms asymm 4
4: 60.16.69.111.dynamic.snap.net.nz (111.69.16.60) 21.007ms

root@nas:~# ping bender.snap.net.nz
PING bender.snap.net.nz (202.37.101.1) 56(84) bytes of data.
64 bytes from bender.snap.net.nz (202.37.101.1): icmp_seq=1 ttl=60 time=6.04 ms
64 bytes from bender.snap.net.nz (202.37.101.1): icmp_seq=2 ttl=60 time=6.22 ms
64 bytes from bender.snap.net.nz (202.37.101.1): icmp_seq=3 ttl=60 time=6.36 ms
64 bytes from bender.snap.net.nz (202.37.101.1): icmp_seq=4 ttl=60 time=6.15 ms
64 bytes from bender.snap.net.nz (202.37.101.1): icmp_seq=5 ttl=60 time=6.20 ms
64 bytes from bender.snap.net.nz (202.37.101.1): icmp_seq=6 ttl=60 time=6.85 ms
64 bytes from bender.snap.net.nz (202.37.101.1): icmp_seq=7 ttl=60 time=6.60 ms
64 bytes from bender.snap.net.nz (202.37.101.1): icmp_seq=8 ttl=60 time=6.08 ms

I'll try the MTU and let you know.
Thanks,

sammcj

75 posts

Master Geek

#405637 17-Nov-2010 00:51

The lag is still there (maybe not quite as bad?).

I have noticed that right now, trademe.co.nz, stuff.co.nz and tvnz.co.nz all load a LOT quicker.

There is still about 2-3 seconds *before* sites like slashot, reddit or Wikiledia load.

Ragnor

8219 posts

Uber Geek

Trusted

#405900 17-Nov-2010 14:09

Hmm try with Firefox + Firebug (addon), goto one of the problem sites then activate Firebug and the Net panel, then refresh the page.

This will give you a graph/tree of all the http requests and their duration, mousing over individual bars will show you stats for each request.

Might help identify the issue (probably routing to a CDN used by advertisers or facebook like etc).

Example: Slashdot home page
http://iforce.co.nz/i/jrbk4ubb.jpg

650KB page weight 40+ http requests is pretty shocking, look at all those third party junk http requests.

sammcj

75 posts

Master Geek

#406053 17-Nov-2010 20:10

Everything seems to be waiting at that initial point:

http://iforce.co.nz/i/abtn1mee.jpg
&
http://iforce.co.nz/i/aq4g5s3x.jpg

I am not a fan of this forum software....

sammcj

75 posts

Master Geek

#406057 17-Nov-2010 20:21

Funny thing:

http://fishnhunt.co.nz/

Loads instantly.
But...
Going to their forums...

http://www.fishnhunt.co.nz/forum/YaBB.cgi

Takes almost a full minute to load!

sammcj

75 posts

Master Geek

#406074 17-Nov-2010 20:54

Fixed it!!!

We entered a friends login/pw details in my ADSL modem and bang! the lag was gone!

So, I called up snap just now, they were very helpful (thanks John!)
First he tried another static IP in the same range, I had the same issues,
Moved me to another range and all is well!

How very odd.

Ragnor

8219 posts

Uber Geek

Trusted

#406098 17-Nov-2010 21:46

Good it got solved in the end but alarming they have a whole ip range that (probably) that causes big delays on http requests.