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Windows 7 + Marvell LAN = High CPU Usage?

Forum Windows 7 : Windows 7 + Marvell LAN = High CPU Usage?

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rwpritchett   07-04-2009 at 06:28:14 PM

I'm trying out Windows 7 RC x64 on my computer and noticed it was showing outrageously high CPU usage at idle. Of course, first stop was task manager which points a finger at "System Interrupts". A quick Google search led me to suspect hardware. Through trial and error disabling components, I found the culprit: Marvell Yukon 88E8001/8003/8010 PCI Gigabit Ethernet Controller

Here is task manager with it enabled, system at idle. All cores are showing usage, but cores #1 and #3 are totally unacceptable:
http://i179.photobucket.com/albums/w319/rwpritchett/Marvell%20LAN/MarvellLANEnabledContinued.jpg

Here is task manager after disabling the Marvell LAN. CPU usage immediately flatlines on all four cores:
http://i179.photobucket.com/albums/w319/rwpritchett/Marvell%20LAN/MarvellLANDisabledAgain.jpg

Just to verify, re-enabling the LAN causes CPU usage to go crazy again:
http://i179.photobucket.com/albums/w319/rwpritchett/Marvell%20LAN/MarvellLANEnabled.jpg

I've tried updating drivers, using many variations of both Microsoft and Marvell drivers with no luck. Is anyone else seeing this problem with the same Marvell LAN controller? Does anyone know of a fix?

I cannot verify whether the LAN is non-functional as I don't use a wired connection. I can just leave it disabled but having this kind of workaround bugs me.


Message edited by rwpritchett on 07-05-2009 at 12:35:56 AM
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jamesgoddard   07-04-2009 at 08:07:45 PM
- 0 +

Your not using it - just disable it and be happy..

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JessicaD   07-06-2009 at 07:20:30 PM
- 0 +

Rwpritchett,


Microsoft does have an official Windows 7 RC Support Forum located here http://tinyurl.com/9fhdl5 . It is supported by product specialists as well as engineers and support teams. You may want to check the threads there for additional support.

Jessica
Microsoft Windows Client Team

Reply to JessicaD
Zoron   07-06-2009 at 09:08:53 PM
- 0 +

Since you're not using the adapter, it's better to disable it anyway... it's taking up resources that could be freed up for other uses. One troubleshooting step I can suggest is to plug it into a router and see what happens. It's probably gobbling up CPU cycles attempting to obtain an IP address. Most likely a bug that will be fixed with newer drivers or when Win 7 goes RTM.

------------------------------ Desktop: Windows 7 Professional 64-bit; Intel Q6600 CPU; E-VGA 780i SLI motherboard; E-VGA E-GeForce 8800GT; OCZ Vista 4GB dual-channel kit; Ultra X2 750W power supply; 2 x Seagate Barracuda 7200.11 500GB in RAID 0. Laptop: Acer Aspire 8730-6314;
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