High CPU Usage Using LAN

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  1. tw33k
    Posts : 3,028
    Windows 7 Ultimate (x64) SP1
       New #1

    High CPU Usage Using LAN


    Got a problem with my work PC. I've been testing the LAN and found that my PC (Win 7) has a high CPU usage (51%) compared with an XP PC (1%) I am using PassMark Advanced Network Test.
    Specs are:

    Athlon II x2 2.70GHz
    4GB RAM
    Realtek 8168B NIC
    Pegatron M2N68-LA MOBO

    All else seems fine. I think the RAM is problematic as I have 2GB generic and 2GB Corsair tri-channel 1066 running as 800 dual-channel but I can't get into the BIOS to do anything with it. Getting another stick of Corsair may be an option but I'd rather avoid spending more money on this PC. Perhaps there's an NIC setting I've neglected.
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  3. zigzag3143
    Posts : 28,845
    Win 8 Release candidate 8400
       New #2

    tw33k said:
    Got a problem with my work PC. I've been testing the LAN and found that my PC (Win 7) has a high CPU usage (51%) compared with an XP PC (1%) I am using PassMark Advanced Network Test.
    Specs are:

    Athlon II x2 2.70GHz
    4GB RAM
    Realtek 8168B NIC
    Pegatron M2N68-LA MOBO

    All else seems fine. I think the RAM is problematic as I have 2GB generic and 2GB Corsair tri-channel 1066 running as 800 dual-channel but I can't get into the BIOS to do anything with it. Getting another stick of Corsair may be an option but I'd rather avoid spending more money on this PC. Perhaps there's an NIC setting I've neglected.
    You using Homegroup, or "workgroup"
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  4. zzz2496
    Posts : 1,325
    Windows7 Ultimate 64bit
       New #3

    Have you updated the driver to the latest update? If so, check in the driver properties in Device Manager, there should be one of more options about "offloading"... try enabling it one by one if it got it.

    zzz2496
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  6. tw33k
    Posts : 3,028
    Windows 7 Ultimate (x64) SP1
    Thread Starter
       New #4

    zzz2496 said:
    Have you updated the driver to the latest update? If so, check in the driver properties in Device Manager, there should be one of more options about "offloading"... try enabling it one by one if it got it.

    zzz2496
    Driver is up to date and Large Send Offload (IPv4) is enabled. I forgot to add that I've also disabled the onboard LAN in the BIOS (one of the few things it will allow me to change)
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  7. tw33k
    Posts : 3,028
    Windows 7 Ultimate (x64) SP1
    Thread Starter
       New #5

    zigzag3143 said:
    You using Homegroup, or "workgroup"
    Can't use Homegroup as no other Win 7 machines. Switching the LAN card's duplex/speed back to auto improved things a little but still very high.
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  8. whs
    Posts : 26,210
    Vista, Windows7, Mint Mate, Zorin, Windows 8
       New #6

    Did you check with Process Explorer which processes are using the CPU?
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  10. tw33k
    Posts : 3,028
    Windows 7 Ultimate (x64) SP1
    Thread Starter
       New #7

    whs said:
    Did you check with Process Explorer which processes are using the CPU?
    That's the strange thing. Nothing shows. The software I'm using to test shows the CPU usage at about 30% now (was over 50%). Task Manager and Resource Monitor show similar but can't find anything in processes that is causing it

    High CPU Usage Using LAN-cpu.png High CPU Usage Using LAN-cpu2.png

    edit: it's gone back to around 50%!

    edit 2: changed the duplex to 100mbps and increased speed by a lot and decreased CPU usage down to around 30-40%. Not perfect but definitely better

    edit 3: This is no good. Tried everything including safe mode but the CPU usage remains high! All other PCs here are XP and performing the tests on all of them give the same results, 1%. The Win 7 PC averages around 30%. I don't like it at all.
    Last edited by tw33k; 20 Apr 2010 at 01:41.
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  11. blue1231988
    Posts : 7
    win 7
       New #8

    the first u must setup antivirus and scan ur laptop , the next u uninstall ur driver lan and restart laptop , then u reinstall driver lan , i think my way sucessful
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  12. whs
    Posts : 26,210
    Vista, Windows7, Mint Mate, Zorin, Windows 8
       New #9

    This is very strange. Your left picture shows CPU usage of 50% but your right picture shows the system idle process at 91% - thus a CPU usage of 9%. Also the usage distribution between the two cores is very odd. All the load seems to be on the left core.
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  13. chev65
    Posts : 8,870
    Windows 7 Ult, Windows 8.1 Pro,
       New #10

    Tweek, do you by any chance have the ForeFront firewall installed?

    If so read this TechNet thread to the bottom of the page.
    High CPU Usage Windows Firewall

    Another TechNet thread with more possible solutions. Apparently this problem can be caused by a number of third party programs or drivers. Starting in safe mode may help to isolate the problem.
    http://social.answers.microsoft.com/...3-6d305695fce0

    So many have reported this problem it's difficult to pin point the cause.
    http://superuser.com/questions/91867...high-cpu-usage

    AVG has also been known to cause this problem.
    http://social.answers.microsoft.com/...b-c307b70a75cf
    Last edited by chev65; 20 Apr 2010 at 12:05.
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