Weird problem: FttH-Speed heavily jumping up and down but then again . . .

sgw62 · Post by **sgw62** » Sat Dec 14, 2013 9:14 am

... the speed is as straight as a line with only XP (or Windows 7) installed, i.e. without any other stuff.

I have been trying to solve this issue spending many, many hours over the last couple of weeks.

Up front, 1 XP and 1 Windows 7 - PC
Both same problems.
It is about fiber, 300Mbps up/down.

Bottomline and that's 100% sure - it has nothing to do with type of UTP cable (best quality CAT5E is used by the way)
nor with the router (Asus), nor with the modem.

When linking a laptop (from a friend) directly to the modem, the download is 317-319Mbps - straight - it could not be better.
Upload has slightly more up and downs, but roughly within 10Mbps at most, and usually ending up around 320-325Mbps, also very good.

When linking my pc's to the modem (direct), the speed goes up and down very heavily, it even drops to zero or so for split seconds.

Like this.
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When I restore a clean Windows image, without any software installed, nor any registry changes, the up and download is perfect! Both on XP and Windows 7, same as the laptop.

So, it must be some Windows settings. All the LAN-properties, TCPIP v4 settings (including advanced settings, DHCP, DNS, Netbios, whatever), they are all in order: compared those settings with the clean XP machine, they are all the same.
FWIW: I also checked the network adapter advanced settings, they are roughly the same and default.

I have also tried: TCP Optimizer
a. set default - reboot (no change)
b. set optimal - reboot (no change)

Also
- tried with resetting TCP-IP settings using: netsh interface ip reset, from elevated command prompt. No results
- running the speedtest without Kaspersky Internet Security active or Norton Internet Security (both temporarily disabled)
- running FF, IE, Chrome

Any suggestions?

So: clean WIndows XP or Windows 7 - speed is perfect (direct or via router).

When installing software, I create images along the way.

The XP has a 'clean' image (say image #1) and an image with some registry settings (#2)
MaxConnectionsPer1_0Server.reg
MaxConnectionsPerServer.reg
PPPProtocolType.reg
ProtocolMTU.reg
ProtocolType.reg

When I restore image #2 the speed is bad, so I assumed these registry entries (not in Windows 7) caused the problem.
I deleted them, rebooted, speed remained bad.

Oh, the XP machine is very simple, just a few programs are installed, nothing special.
The Windows 7 has many more and other programs.

I gave up . . .

Very sorry for the long story, but it is pretty complex.
(I am afraid, in the end, I will need to re-install Windows from scratch)

TIA

akbarri · Post by **akbarri** » Sat Dec 14, 2013 1:03 pm

sgw62 wrote:I gave up . . .

Don't

sgw62 wrote:(I am afraid, in the end, I will need to re-install Windows from scratch)

Nope, U say

sgw62 wrote:When installing software, I create images along the way.

And I think u already have the Answer

sgw62 wrote:... the speed is as straight as a line with only XP (or Windows 7) installed, i.e. without any other stuff.
..................
When I restore a clean Windows image, without any software installed, nor any registry changes, the up and download is perfect! Both on XP and Windows 7, same as the laptop.
..................
So: clean WIndows XP or Windows 7 - speed is perfect (direct or via router).

My Suggestions
1. Restore Clean Windows Image.
2. Don't do Any Registry Change.
3. Turn Off Windows "Automatic Updates".
4. Turn Off Any Software Background "Automatic Updates". (After Installed)

See what happen when u Turn Off that "Automatic Updates".
I read that u get mess up after Installing Software.
Hope u could find the "Root Cause".

sgw62 · Post by **sgw62** » Sun Dec 15, 2013 5:59 am

Well, the thing is, when I restore the Windows only image, download looks like this

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Then I installed video driver, audio, added some wellknown registry settings(*)
MaxConnectionsPer1_0Server.reg
MaxConnectionsPerServer.reg
PPPProtocolType.reg
ProtocolMTU.reg
ProtocolType.reg
updated windows, rebooted, one or two times and created the 2nd image.

(*) They seemed to be handy for my slow ADSL-connection.

with image 2 restored, I got these results:

So, I suspected the registry entries to be at fault, again they were based on ADSL, guess there is no need now.
I removed them all, rebooted, the results remained the same (=bad).

So I restored to image 1: good download
re-applied the registry entries to check if indeed the were causing the issue.
Download was very slightly fluctuating but still all remained above 310 all the time.

So, I assume the registry settings were not the issue.
I've got no idea.
Along the way I created about 5 images, but with #2 for some weird reason, it goes wrong.

BTW: I am really sorry for the big screenshots. I donot see a way to add them as thumbnails, so they show up as small but you need to click on them to expand.

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sgw62 · Post by **sgw62** » Sun Dec 15, 2013 11:12 am

Later
Restored a clean Windows XP, without any drivers, whatever.
Absolutely clean.
Then Firefox v26 + flashplayer (without Flash Player the speedtest would not run)
Speedtest was bad
Then flash player for IE,
launched IE
Speedtest was okay.

Speedtest on Windows 7, IE11 x64 was bad as well (just for info)
Download speeds also were bad on Windows 7.

See previous graphs.
Strange ..
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