 TSI GabePremium,VIP
join:2007-01-03
Chatham, ON
kudos:2 | reply to BrianON
Re: [Cable] Connection grinds to a halt when uploading... one thing that pops to mind is that somehow the ethernet connection to the modem negotiated in half-duplex. I've seen this a few times |
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| reply to kimks3
This does not make sense. We are talking about broadband internet not traditional internet. Bandwidth is divided into multiple channels. Each channel uses different frequency. They don't interfere with each other.
One physical cable,
8 downstream channels
4 upstream channels
If the saturated upstream channels can slow down downstream channels,
there is no point to have multiple channels. |
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Reviews:
 ·TekSavvy Cable
| said by pph:This does not make sense. We are talking about broadband internet not traditional internet. Bandwidth is divided into multiple channels. Each channel uses different frequency. They don't interfere with each other.
One physical cable,
8 downstream channels
4 upstream channels
If the saturated upstream channels can slow down downstream channels,
there is no point to have multiple channels.
TCP/IP (which most connections use) requires response packets that say which packets have been received OK and that it can send more. If your downloading and your response packets don't make it due to congestion or something else the download will slow down as the sender throttles back on sending packets. |
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| reply to TSI Gabe
>one thing that pops to mind is that somehow the ethernet connection to the modem negotiated in half-duplex.
The data rate is 1Gbps (or 100Mbps for older routers). Transferring 10KBytes/sec would be on the order of 100kbps of data which would only take up a tiny fraction of the time slots. That's 0.1/100 or 0.1/1000 of the time slots.
Same type of linear thinking reasoning that tell people to check Ethernet cables or the power supply when the person can see the modem webpage. A big waste of time that shows that you can't debug systematically. |
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| reply to kimks3
How do I get QoS going?
I have a DD-WRT on my router.
Any tutorials? |
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| reply to kimks3
I suspect half duplex too. That would explain it. However it is year 2012. It should be full duplex these days.
By the way, TCP/IP is OSI layer 3. This upload/download issue is layer 2 and layer 1. Layer 1 is the physical layer. We are talking about broadband not single band. Broadband has many channels. Each channel is independent. |
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brad
join:2007-09-06
Etobicoke, ON | said by pph:I suspect half duplex too. That would explain it. However it is year 2012. It should be full duplex these days.
It should be but there is the remote chance there is an auto-neg issue. Surprisingly enough I have run into this between modern day equipment from Cisco (both ends) for example. |
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1 edit | reply to kimks3
I think I found a solution. I just set up QoS and it actually works.
Ping usually spiked from 30 ms to 500 ms+ when uploading files, but with the QoS the ping spikes from 30 ms to only 60 ms.
If you are running a DD-WRT I can help you set up QoS.
Which might reduce the lag.
Reply to this if you are interested. |
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Reviews:
 ·WIND Mobile
·TekSavvy Cable
 ·TekSavvy DSL
| reply to kimks3
said by kimks3:Please read the post before responding. This occurs even when the upload speed is capped at 10KB/s. It is not due to the upstream becoming saturated and affecting the download speeds.
As an example, I can be downloading a file at 1MB/s, and if I unpause my Dropbox sync, the file download speed slowly drops to ~20KB/s. This happens even if I have Dropbox upload limited to Have you had any speedtests that max out the upload? I noticed the ones you posted don't seem to. Have you tried connecting without the router?
FWIW I have a 28/1 connection. I ended up having to replace my router as it couldn't handle the higher speeds esp with QOS turned on and then install tomato on the new router to get proper QOS. Surprising to me, I found without QOS using anything more than about 25% upload capacity caused issues with my VOIP. |
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Reviews:
·TekSavvy Cable
| said by graniterock:FWIW I have a 28/1 connection. I ended up having to replace my router as it couldn't handle the higher speeds esp with QOS turned on and then install tomato on the new router to get proper QOS. Surprising to me, I found without QOS using anything more than about 25% upload capacity caused issues with my VOIP. The prioritization part of QoS helps VOIP a lot. Normally a router sends packets in the same order they were received. So a VOIP packet arriving after several large dropbox upload packets would have to wait. With prioritization the VOIP packet gets sent first. |
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moffa
join:2007-10-14
Ajax, ON Reviews:
 ·CIKTEL Telecom
| reply to kimks3
I'm having huge issues with uploads now. Previously I could upload at 80 kb/sec and my ping times would be well under 100 ms. Now its about 1000 ms when I upload at 80 kb/sec. I can only assume the latest Rogers update broke the network as I have to reduce my upload speed to 50 kb/s to have ping times under 100 ms. |
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 sbrookPremium,Mod
join:2001-12-14
Ottawa
kudos:4
·TekSavvy Cable
1 edit | reply to kimks3
This smells of Rogers throttling returning in a different form!
But seriously, the signals levels look good.
The Upstream speed is low ... there's no reason to think that it should not be the full 512 for cable 18 service.
So that suggests that something else is using the upstream even when you aren't to your knowledge.
Certainly whatever the problem is, it is absolutely from the wan side of your router to Rogers CMTS. |
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moffa
join:2007-10-14
Ajax, ON Reviews:
·CIKTEL Telecom
| That's exactly what I was thinking. I've never been throttled before and it's weird because speedtest still shows my speed at 35/1. Either that or they've pooched their uploading increase .. typical Rogers.
It's frustrating being stuck with an incompetent company (Rogers) and Bell which charges 2x the price. |
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