Is win7 throttling my gigabit to 100mbps?

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ezzye23

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Jan 25, 2005
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Cannot wrap my head around this, so if anyone can help that would be great.

My setup is as follows: cable modem going to my Linksys wrt600 router which has several ports. One port to self built win7 prof. pc and using marvell yukon onboard ethernet and connection says 1.0 Gbps. Another port going to linksys 5 port gigabit switch then to the media center pc with vista prof that also has onboard ethernet and shows 1.0 Gbps.

Now, on one of the ports of the 5 port switch a cable goes into the problem pc which is win7 prof as well. This also has marvell yukon onboard but the connection shows 100mbps.
I have tried everything I can think of to troubleshoot this: updated the drivers of the onboard ethernet, disabled and installed linksys gigabit adapter with same result.
Also tried netgear gigabit adapter, showed 1.0gbps once but then went back to 100.
I took the same cable that showed 1.0Gbps on the vista pc and plugged into the problem pc and still shows 100, so cable can't be the issue.
What the hell!!!!!

Before I installed win7 I had vista ultimate on this particular machine. I was having the same problem and using the onboard, but I changed the adapter setting in vista to 1000 full duplex and it stayed at gigabit. I had no luck changing this setting in win7. Just shows network cable uplugged and never connects.

Please help someone, this is killing me.
Sorry for the long post
 
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spidey07

No Lifer
Aug 4, 2000
65,469
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Homemade cables can cause this behavior. Make sure you're using store bought cat5e or better cables. Even if the symptom doesn't follow the cable the cable can still be bad if it's homemade.
 
JackMDS

JackMDS

Elite Member
Super Moderator
Oct 25, 1999
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Win 7 or any other version of Windows does not throttle the Network this way.

The mere fact hat it gave trouble with Vista as well indicate some trouble with the hardware.

Disconnect all other device from the Network and leave the "bad computer" and one other computer that does Giga. Put the two on Auto negotiate Network and see what happen.
 
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ezzye23

Member
Jan 25, 2005
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JackMDS,
I unhhooked everything from the network and just had that machine and one other.
It was doing fine at 1.0Gbps. So apparently there is something on the network.
I slowly hooked things back up and it appeared that one of the cables is a cat5 coming out of the switch. I left that one out and so far everything is running gigabit.
Could that cable have been causing this the whole time?

Thanks for the help guys.
 
her209

her209

No Lifer
Oct 11, 2000
56,336
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ezzye23 said:
JackMDS,
I unhhooked everything from the network and just had that machine and one other.
It was doing fine at 1.0Gbps. So apparently there is something on the network.
I slowly hooked things back up and it appeared that one of the cables is a cat5 coming out of the switch. I left that one out and so far everything is running gigabit.
Could that cable have been causing this the whole time?

Thanks for the help guys.
Click to expand...
Yup, Cat 5 only uses 4 wires (2 pairs). Gigabit requires 8 wires (4 pairs).
 
her209

her209

No Lifer
Oct 11, 2000
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Although you said that you took the cable that was working for the Vista HTPC and used it for the problem PC and got the same 100 Mbps result?
 
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ezzye23

Member
Jan 25, 2005
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Ahhhhh. I am about to take a shit on this computer. Right after the above post I checked my connection again and bam...100Mbps. So I gathered myself, straighted up the office after I threw a couple of things, and unhooked everything one by one. I had one computer registering 1.0Gbps and the problem computer, both plugged into the router. Like I did before, per JackMDS. The problem computer still says 100Mbps. So I check the cable with LAN cable tester, and no short, seems good. I plug the cable modem directly into the problem computer and the netgear 100Mbps light lit up instantly. What the hell? I replug everything back up and rebooted the computer and now it says 1.0Gbps.

I am losing my mind here. Only thing I did different before the reboot, was plug the problem computer directly into the router and not the switch. But the switch is a 10/100/1000 switch, so why would that matter?
So right now it says 1.0Gbps as I type this
Any insight?

Thanks
 
Crusty

Crusty

Lifer
Sep 30, 2001
12,684
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ezzye23 said:
Ahhhhh. I am about to take a shit on this computer. Right after the above post I checked my connection again and bam...100Mbps. So I gathered myself, straighted up the office after I threw a couple of things, and unhooked everything one by one. I had one computer registering 1.0Gbps and the problem computer, both plugged into the router. Like I did before, per JackMDS. The problem computer still says 100Mbps. So I check the cable with LAN cable tester, and no short, seems good. I plug the cable modem directly into the problem computer and the netgear 100Mbps light lit up instantly. What the hell? I replug everything back up and rebooted the computer and now it says 1.0Gbps.

I am losing my mind here. Only thing I did different before the reboot, was plug the problem computer directly into the router and not the switch. But the switch is a 10/100/1000 switch, so why would that matter?
So right now it says 1.0Gbps as I type this
Any insight?

Thanks
Click to expand...

This screams of a cabling problem OR a duplex mismatch between your NIC <--> switch.

My money is on bad cables though, unless you can remember exactly how old the cables are and when/where you have used them it's time to buy a new one. Just because your cable tester shows the cable has no shorts does not mean the cable can run @ 1000mbps. You need a much more expensive tester to determine that.

Like JackMDS said above, just replace your cables with new and working cables and then go from there.
 
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ezzye23

Member
Jan 25, 2005
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her209 said:
Are the two Marvell Yukon onboard NICs the same? What happens if you directly connect the two NICs together? You can use the patch cable.
Click to expand...

No, not the same model. Are you saying connect the two computers together with the patch cable. Then what?
 
her209

her209

No Lifer
Oct 11, 2000
56,336
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ezzye23 said:
No, not the same model. Are you saying connect the two computers together with the patch cable. Then what?
Click to expand...
See what the negotiated speed is. See if it goes back to 100Mbps after a while. It could be the NIC and switch are "incompatible".
 
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ezzye23

Member
Jan 25, 2005
35
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Crusty said:
This screams of a cabling problem OR a duplex mismatch between your NIC <--> switch.

My money is on bad cables though, unless you can remember exactly how old the cables are and when/where you have used them it's time to buy a new one. Just because your cable tester shows the cable has no shorts does not mean the cable can run @ 1000mbps. You need a much more expensive tester to determine that.

Like JackMDS said above, just replace your cables with new and working cables and then go from there.
Click to expand...

Ok, interesting since I have been posting the connection has blanked out 3 times, like a split second each and then come back.
Wonder if it could be a router issue.
Guess, I will go on monoprice and get some new cables and go from there like you said.
 
her209

her209

No Lifer
Oct 11, 2000
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What is the model switch you are using? See if there are other people having speed negotiation issues with the same model switch and/or NIC.
 
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ezzye23

Member
Jan 25, 2005
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her209 said:
See what the negotiated speed is. See if it goes back to 100Mbps after a while. It could be the NIC and switch are "incompatible".
Click to expand...

Only thing though, this switch was tried with 2 different brand NIC, linksys and netgear. And also the onboard Marvell Yukon. All same result.
 
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ezzye23

Member
Jan 25, 2005
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I have also had issues with two wireless machines (g and N) dropping the connection off and on, but just attributed that to immature win7 drivers. Now I'm starting to wonder.
Thanks for all the help.
 
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ezzye23

Member
Jan 25, 2005
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JackMDS said:
Onboard Marvell Yukon has problem with Win 7.

Log to Marvel site and look for the latest Drivers (they posted them few week ago).

http://www.marvell.com/drivers/driverSearchResults.do
Click to expand...

Yeah, that was dated day win7 came out, I got those already. Don't forget one of other computers has marvell onboard and doing fine. Just to let you know I took the switch out of the equation and just using the router now. Just seeing what happens. So far it has been staying at 1.0Gbps.
 
JackMDS

JackMDS

Elite Member
Super Moderator
Oct 25, 1999
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I had bad luck with a Netgear Giga switch.

It did work but could Not get beyond 38MB/sec.

I unplugged the Netgear, and plugged this, http://www.newegg.com/Product/Produc...82E16833156251

Every thing else equal, just the above TrendNet instead of the Netgear, and it does up to 75MB/sec.

However YMMV, the sad fact is that with all the new development End Users' Giga hardware is Not really ready as is for Prime time. A little more time an aggrivation and at the end it would work.
 
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ezzye23

Member
Jan 25, 2005
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Just for the record, the switch I'm using is a Linksys. Netgear is the current NIC I'm using.
 
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ezzye23

Member
Jan 25, 2005
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her209 said:
So you're not using the Marvell Yukon NIC on the problem PC right now?
Click to expand...

No, using the Netgear NIC right now. Sorry, I know it gets confusing, I was just going crazy trying to find something that worked. Anyway so far the connection is 1.0Gbps with the linksys switch out of the equation. If that is the answer, what am I going to do with these other two connections that I had in the switch?
Going to give it a little time to see if it drops down again. I did order new cables from Monoprice just in case.
 
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