Speed is fluctuating to less than half
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- Re: Speed is fluctuating to less than half
Speed is fluctuating to less than half
14-05-2009 10:49 AM
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Re: Speed is fluctuating to less than half
14-05-2009 10:51 AM
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You've been connected to the internet solidly for over a month.
I'd initially suggest rebooting your router
Re: Speed is fluctuating to less than half
14-05-2009 11:47 AM
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Thanks. That seems to have done the trick!
Re: Speed is fluctuating to less than half
14-05-2009 12:12 PM
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Quote from: Jameseh I'd initially suggest rebooting your router
Why does this work? I try to leave my router up 24/7 for as long as possible, to keep the profile at a reasonable value for my line (currently 1500). More often than not the router stats show a SNRM of 3-4dB, which is below the target of 6dB and therefore I would expect a reboot to give me a lower sync rate. What effect does a long time between reboots have on the router which can result in speed (throughput) fluctuations?
Re: Speed is fluctuating to less than half
14-05-2009 12:23 PM
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A reboot is always the best first action.
Re: Speed is fluctuating to less than half
14-05-2009 1:19 PM
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Its now just a question of finding the best time in terms of noise margin.
Incidentally, VMBU hasn't updated for over 3 hours, so maybe the connection has dropped of its own accord (I'm at work so can't tell at the moment).
Edited @ 15:10 - VMBU now updated, seems that someone may have given it a kick.
Re: Speed is fluctuating to less than half
14-05-2009 3:45 PM
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Re: Speed is fluctuating to less than half
14-05-2009 4:26 PM
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jelv (a.k.a Spoon Whittler) Why I have left Plusnet (warning: long post!) Broadband: Andrews & Arnold Home::1 (FTTC 80/20) Line rental: Pulse 8 Home Line Rental (£14.40/month) Mobile: iD mobile (£4/month) |
Re: Speed is fluctuating to less than half
15-05-2009 9:57 AM
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Quote from: Anotherone Look it up and post about it - education is a fine thing
OK Chris, I've taken up the challenge, and now my head is spinning. I think maybe I should stick to my day jobs, polishing cars and writing safety assessments for nuclear power stations.
Anyway, I think what Jameseh was hinting at was the NAT (network address translation) table. The NAT table is part of the NAT operation, which takes place within the router (or any NAT-enabled device) . Each connection from the internal network (ethernet side of the router) to the external network, and vice versa, is tracked and a special table is created to help the router determine what to do with all incoming packets on all of its interfaces This table is populated gradually as connections are created across the router. It appears that deleting entries is a less efficient process than creating them, so depending on the capacity of the router this table can become congested such that browsing becomes slower. Rebooting the router clears the entries in the table.
It appears that I have answered my own question, at least to the level of detail I can comprehend. If anyone wants to add to, correct or contradict what I have posted, I wouldn't be at all offended (or surprised).
Re: Speed is fluctuating to less than half
15-05-2009 10:17 AM
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I don't know if this applies universally, but on my DG834GT you can definitely see it, though I guess it depends on your noise margin and the type of interference you get and how it varies over time.
The effects are small and a regular (every week or so) reboot restores the speed to optimum.
Re: Speed is fluctuating to less than half
15-05-2009 10:48 AM
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With my Netgear DG834G with the Broadcom chip as in the GT it is much less obvious except if I push the speed up to the point where the errors overnight get quite high. Under these conditions the noise margin doesn't recover fully during the day without a resync.
Re: Speed is fluctuating to less than half
16-05-2009 5:01 PM
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Quote from: maranello OK Chris, I've taken up the challenge, and now my head is spinning. I think maybe I should stick to my day jobs, polishing cars and writing safety assessments for nuclear power stations.
Nah, you've become a line stats expert so I knew you could do it. That looks a reasonable explanation that most can understand
Re: Speed is fluctuating to less than half
20-05-2009 9:21 AM
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Quote from: Anotherone Nah, you've become a line stats expert
Hardly Chris, but I'm getting better.
I decided that this morning would be a good time to check noise margin and do a reboot, since I believed I had kept sync for about a month continuously. It turns out that a resync occurred two days ago and sync rate was halved (896kbps). Router was reporting SNR margin of 6.5dB d/s so I decided a reboot was worth going for. My D-Link dsl-2640B has a 'Reboot' button in the interface, which I clicked, but connection was not restored. Router was apparently in sync with exchange (DSL light green) but Internet light not lit. I did notice that the wireless lan was enabled, even though previously I had disabled wireless. Started to wonder if somehow the router had been hacked, then I heard the toaster pop up so decided to power down and leave it alone as I don't like cold toast . Thinking about it on the drive to work it occured to me that maybe the router had undergone a factory reset such that the connection/authentication details were reset. This would account for the symptoms but I don't understand how the reset could have happened as this shouldn't occur unless the reset button on the back of the router is pushed in. Anyone else had this happen?
Can anyone at Plusnet tell me if the resync on Monday at approx 2pm was deliberate as a result of load balancing reconnections, or is it more likely to be random?
Re: Speed is fluctuating to less than half
20-05-2009 9:58 AM
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We didn't have any drops on our network around that time.
Re: Speed is fluctuating to less than half
20-05-2009 10:35 AM
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