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Plusnet Usergroup » All Users - The Open Forum » Plusnet Network and Technical Issues » More speed/latency analysis
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Author Topic: More speed/latency analysis  (Read 7911 times)
rdrake
Guest
« on: December 06, 2006, 04:38:52 pm »

This graph shows typical latency increasing at this time of day (when the schoolkids get home). It's always accompanied by lower speeds. Why does latency only increase part-way through the PN network? After hop 4 usually? Does this show a problem with data transmission through the network itself rather than the WAN?


chesterfield

Posts: 38

« Reply #1 on: December 06, 2006, 08:46:17 pm »

Could this be due to the ellcoyas being physically incapable of dealing with the number of packets thrown at them?
pwebb

Posts: 142

« Reply #2 on: December 06, 2006, 08:57:00 pm »

Could this be due to the ellcoyas being physically incapable of dealing with the number of packets thrown at them?

No, The Ellacoyas are located between hops 2 and 3.

The latency increase is on the STM-1 link between London and Sheffield and would only be on a trace when you are connecting to our servers. This link does not carry any of your internet traffic.

Phil
chesterfield

Posts: 38

« Reply #3 on: December 06, 2006, 09:11:26 pm »

The max ping to hop 3 certainly seems to show an increase too doesnt it?  I honestly dont know how to read these properly, but it seems between hop2 and 3 there is some sort of delay too..
rdrake
Guest
« Reply #4 on: December 07, 2006, 08:20:06 am »

This is the "normal" graph...  speeds are high and latency is low..
chesterfield

Posts: 38

« Reply #5 on: December 07, 2006, 09:33:23 am »

Notice the average drop between hops 2 and 3 again.  I still think the ellacoyas are buckling under the peak traffic load.
Colin
Usergroup Member

Posts: 6339


WWW
« Reply #6 on: December 07, 2006, 10:13:06 am »

Notice the average drop between hops 2 and 3 again.  I still think the ellacoyas are buckling under the peak traffic load.

Are we looking at the same graphs? Hop 2 and 3 both have an average of 32 in the latest - it deosn't increase until hop 5 and 6...

Colin Ogilvie
Plusnet Usergroup Member
Using: Plusnet Extra
jelv1

Posts: 2130

« Reply #7 on: December 07, 2006, 10:16:07 am »

I thinks that's the point - that is how it should look. In the previous graph the averages for 2 & 3 were 34 & 47.

jelv
chesterfield

Posts: 38

« Reply #8 on: December 07, 2006, 10:19:48 am »

Yes thats what I meant.

The average change between hop 2>3 in the latest (off peak) chart is 32.  In the first chart (on peak) it is 47.  Is this due to the ellacoyas not being able to handle the volume of traffic thrown at them during peak hours?

Its an honest question as I havent got a clue, just loking for answers at the moment.
rdrake
Guest
« Reply #9 on: December 07, 2006, 10:22:33 am »

I would have thought that this definitely shows a problem within the PN system though. Otherwise latency would be high from hop 2? Or maybe I'm wrong? Any expert care to comment?
chesterfield

Posts: 38

« Reply #10 on: December 07, 2006, 10:48:01 am »

It seems to go wrong within PN somewhere, but as you say, probably an expert needed to help us al out! lol.
rdrake
Guest
« Reply #11 on: December 07, 2006, 04:30:58 pm »

Same again this afternoon...
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