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Re: Think Broadband Ping Monitor Results (POST YOURS)
that user is on a different port anyway I think.
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Re: Think Broadband Ping Monitor Results (POST YOURS)
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Your latency already changed before switching to modem mode, and you haven't provided any direct comparison between the two (i.e. before/after/before again). It could have been completely coincidental, something to do with the IP change, or the switch itself. Looks like your Superhub Normal graph stops around 11:30pm. Your modem mode graph doesn't start until 4pm. We don't even know how many days apart that is, and anything could have happened in the intervening time that's nothing to do with either the Superhub or modem mode. Comparing two things many hours/days apart really doesn't give us much to go on... (If you want to compare latency and jitter in the two modes, get a decent ping program, and ping the nearest node you can on the VM network, and do an immediate comparison) |
Re: Think Broadband Ping Monitor Results (POST YOURS)
Qasi - are you up on the theory as to why modem mode might have lower latency than router mode? Or, of course, definitely wouldn't have lower latency?
I can see you're saying above that the particular results posted by Boroboi aren't of a standard from which deductions can be drawn. But, in theory ...... |
Re: Think Broadband Ping Monitor Results (POST YOURS)
It's quite possible that modem mode would have slightly lower latency, but I wouldn't expect that much simply between the two modes. There's a lot of variables though, for example the Superhub's firmware may simply not be programmed to respond to pings at the highest priority, something that is quite common on carrier network equipment. Another example variable would be the SH needing to inspect the IP packet in router mode, determine if it is for itself or a device being NAT'ed behind it and then determine where to pass it to, a process that takes time, and something it doesn't have to do in "modem mode". Also, higher average CPU load in router mode, etc.
In the end I'd expect ~0.5-1ms difference between the two modes but larger differences are probably a result of different routing in other parts of the network. If we wanted to make a direct comparison between the SH in modem and router mode, best thing would be to ping from something *behind* the SH rather than relying on the SH itself to respond to pings - i.e. use the same endpoints in both situations, and also to try obtain the SH's WAN MAC and clone that if so that the PC/router would get the same IP address from VM's network. That'd rule out any differences in routing based on IP address. |
Re: Think Broadband Ping Monitor Results (POST YOURS)
A lot of what you say makes sense. But if you displace the routing functions to an external device, the same factors arise.
I suppose someone could frig around with powerful and less powerful external routers which would confirm or otherwise the postulations you have offered. |
Re: Think Broadband Ping Monitor Results (POST YOURS)
If we shift the routing to an external device, or remove it entirely (i.e. don't use a router) then we isolate the effect of the Superhub's routing functionality - isn't that what we want?
(I'll also add it's not how much power you have but how you use it, i.e. the quality of the software running on the device is more important. The Superhub runs some funny real-time operating system called eCos. Apart from the name, I know very little about it.) |
Re: Think Broadband Ping Monitor Results (POST YOURS)
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There is around a 30 minute difference in the times as it was close to midnight, so i just showed the graph from the next day onwards. http://www.thinkbroadband.com/ping/s...19-03-2012.png http://www.thinkbroadband.com/ping/s...20-03-2012.png Quote:
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Re: Think Broadband Ping Monitor Results (POST YOURS)
I'm really quite unhappy about the loss of my mid-evening latency bumps. I've got nothing to moan about.
[img]Download Failed (1)[/img] Do you think I've had a visit from the latency fairy? |
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Superhub router mode, LAN side, firewall off: RTTs of replies in ms: min/avg/max/dev: 0.322 / 0.363 / 1.091 / 0.037 Superhub router mode, modem side, firewall off: RTTs of replies in ms: min/avg/max/dev: 0.363 / 0.401 / 1.170 / 0.033 Superhub router mode, LAN side, firewall on: RTTs of replies in ms: min/avg/max/dev: 0.419 / 0.472 / 1.012 / 0.054 Superhub router mode, modem side, firewall on: RTTs of replies in ms: min/avg/max/dev: 0.370 / 0.417 / 5.862 / 0.179 Superhub modem mode: RTTs of replies in ms: min/avg/max/dev: 0.260 / 0.293 / 1.103 / 0.043 VMNG300 modem mode: RTTs of replies in ms: min/avg/max/dev: 0.338 / 1.321 / 46.820 / 4.460 Not a lot of difference, router mode increases latency by about 0.05ms. And just a bit of trivia: A slower router: RTTs of replies in ms: min/avg/max/dev: 0.298 / 0.328 / 0.765 / 0.021 A faster router: RTTs of replies in ms: min/avg/max/dev: 0.215 / 0.254 / 0.578 / 0.029 BT FTTC Modem: RTTs of replies in ms: min/avg/max/dev: 0.387 / 0.467 / 1.279 / 0.053 ---------- Post added at 23:17 ---------- Previous post was at 23:06 ---------- Quote:
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Re: Think Broadband Ping Monitor Results (POST YOURS)
My IP address changed recently, and there is a slight difference.
With 'New' 77.102.x.x IP Address http://www.thinkbroadband.com/ping/s...24-03-2012.png With 'Old' 94.169.x.x IP Address http://www.thinkbroadband.com/ping/s...09-03-2012.png Minimum latency has increased, but I don't notice any real difference in real-world use (I don't play ping-dependant games). 110Mb Product |
Re: Think Broadband Ping Monitor Results (POST YOURS)
https://www.cableforum.co.uk/images/...012/04/113.png
Can anybody explain what on earth is happening in regards to those peaks and troughs? Those large average and max spikes are downloads while the packet loss seems to be a problem throughout my area as the core and ubr also show it my guess is congestion to tbb somewhere. |
Re: Think Broadband Ping Monitor Results (POST YOURS)
its due to the way the VMNG300 buffers packets, basically a lot better than the superhub
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