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Topic # 59291 1-Apr-2010 01:18
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I've had a problem for a while that I've only now had the time to look into.

My WHS has an Athlon X2 64 5000+ CPU.   Quite often one of the cores in the CPU will just start working overtime and max its performance.  The other core stays at normal usage. 

Nothing shows in the processes list that stands out as using any of the CPU, and memory usage is pretty standard too.  When this happens my RDP access to the server slows to a crawl, responsiveness of applications on the server slows (eg browsing windows explorer).  The WHS console is not running when this happens.  

The only computers connected to the WHS are a Mac mini running OSX, also running Plex that accesses some shared video folders on the WHS.  When this happens the access to the folder shares slows and any videos that are playing time out and stop playing.  I then can't start them again until such time as the CPU comes back to normal, usually 5-10 minutes later.

There are no other applications running in the taskbar or the background.  I suspect it has to do with folder duplication, as I can hear some disk access while it's happening. I have about 80GB free of a 4.5TB server storage pool.

I've installed the AMD processor drivers but this made no difference, all Windows updates are applied, and all other drivers are up to date.   

There's no real regularity to the timing of this, just seems to do it whenever it's most inconvenient :)

Anyone out there have any ideas what might be causing this?  Or how I can investigate the processes further - beyond the standard Task Manager list that doesn't seem to be giving any clues away?  

Here's a screenshot:

 

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  Reply # 313682 1-Apr-2010 01:53
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CtrlAltElite: Weird, so lets get this straight. The task manager is saying your CPU is on full load


Correction, only one core of the two is on full load, and only now and then.  I doubt it's viral or malware, but I'll check.  I've just found a couple of older services that i no longer use so I've disabled those for now to test this out. 



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  Reply # 313689 1-Apr-2010 02:04
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Cool thanks for the info, will have a read over breakfast tomorrow :)

 
 
 
 


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  Reply # 313737 1-Apr-2010 09:45
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Can you post a screenshot of the processes tab when this is happening, remember th click the Show All Processes button.  I have not seen a machine where cpu usage is high, but nothing showing in processes.  Kernel cpu usage?

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  Reply # 313740 1-Apr-2010 09:50
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This could possibly be disc ativity related. I've noticed that when adding lots of files to the WHS (which I don't anymore since it's all there now) everything would get really slow. I suspect the balance process (the one that copies files across the drives for those duplicated folders) might be chewing some CPU calculating where to put the duplicate files - and where to move existing files to.

Then obviously there's the actual I/O operations and the whole server might get really slow.

As I said this is something that happens when either a) you are adding a lot of new files or b) the storage space is almost full and you add new large files, that require a lot of small files to be moved around.

You should just let it do its thing for a couple of days... Then wait and see. And I am using a P4 on a NVIDIA platform motherboard on my WHS.







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  Reply # 313781 1-Apr-2010 11:12
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mikerussellnz: Can you post a screenshot of the processes tab when this is happening, remember th click the Show All Processes button.  I have not seen a machine where cpu usage is high, but nothing showing in processes.  Kernel cpu usage?


Will do tonight if/when it happens. 



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  Reply # 313782 1-Apr-2010 11:13
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freitasm: This could possibly be disc ativity related. I've noticed that when adding lots of files to the WHS (which I don't anymore since it's all there now) everything would get really slow. I suspect the balance process (the one that copies files across the drives for those duplicated folders) might be chewing some CPU calculating where to put the duplicate files - and where to move existing files to.

Then obviously there's the actual I/O operations and the whole server might get really slow.

As I said this is something that happens when either a) you are adding a lot of new files or b) the storage space is almost full and you add new large files, that require a lot of small files to be moved around.

You should just let it do its thing for a couple of days... Then wait and see. And I am using a P4 on a NVIDIA platform motherboard on my WHS.



Definitely not copying or moving files around, this happens when the WHS is largely idle.  I only notice it running files across the network, not actually moving them around or anything.  That's not to say that it isn't disk related, just not related to copying, moving, deleting large files. 

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  Reply # 313784 1-Apr-2010 11:21
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  Reply # 313795 1-Apr-2010 11:37
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As it may be disk related, there is a WHS plugin called SMART, or something like that, that monitors your HDD(s) health via the SMART HDD stats. It may show an impending failure.




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  Reply # 313796 1-Apr-2010 11:39
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SepticSceptic: As it may be disk related, there is a WHS plugin called SMART, or something like that, that monitors your HDD(s) health via the SMART HDD stats. It may show an impending failure.


Thanks, I've got that installed already, all drives are very healthy indeed.

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  Reply # 313801 1-Apr-2010 11:52
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Running Lights Out ? There was a service that needed to be disabled.




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  Reply # 313802 1-Apr-2010 11:54
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SepticSceptic: Running Lights Out ? There was a service that needed to be disabled.


Lights out was installed but not running, I uninstalled it last night when I posted initially.  Also removed disabled Virtual Server services and uninstalled it.  

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  Reply # 313825 1-Apr-2010 12:31
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Hmm I read this and thought about my issues I have had with maxed cpu

You said you checked and this is prob not affecting you so just in case here is the details.

see Microsoft connect  and search for

searchindexer.exe and portfwd.exe (says resolved but its not) both have bugs logged for excess cpu





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  Reply # 313829 1-Apr-2010 12:35
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Lipex666: Hmm I read this and thought about my issues I have had with maxed cpu

You said you checked and this is prob not affecting you so just in case here is the details.

see Microsoft connect  and search for

searchindexer.exe and portfwd.exe (says resolved but its not) both have bugs logged for excess cpu



Ahh that reminds me, I also uninstalled Windows Search 4.0 last night.  From memory it still occurred afterward, but I was tired so might need to double check.

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  Reply # 313830 1-Apr-2010 12:35
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I would suggest using sysinternals process tool next time it is happening. It will defiantly show you what is using those CPU cycles.

Also you did not confirm that the show all processes check box when it was happening?







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  Reply # 313831 1-Apr-2010 12:38
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Also you did not confirm that the show all processes check box when it was happening?


I did reply stating that I would check this tonight when/if it happens again. 

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