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Hyper-V Dynamic memory, Driver Locked

Unanswered Hyper-V Dynamic memory, Driver Locked

  • lunedì 14 maggio 2012 09:36
     
     
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    Hello All,

    I've been wondering about the following.

    I have 2 Dell R910 (Windows Server 2008R2 SP1) machines as my Hyper-V host machines, with around 40-50 VMs running on it. For most of my servers I've enabled dynamic memory, but on some of these machines I've seen the following:

    For some reason this machine running Remote Desktop Services (with Web Access) is using around 3.8GB of memory.

    Processes list only a fraction of the actual Memory being used.

    But RAMmap shows that 2.5GB is being used by Kernel Drivers. From what I've read this might be the balooning effect of the dynamic memory. However, the RAM usage was the same yesterday evening (12h before I took these screenshots), when no one was actually working on this server.

    I've seen this happen on multiple of my guest machines, the machines are running Windows Server 2008 R2 SP1 Datacenter Edition.

    Can anyone explain to me why it is doing this?

    Thank you.

    Kind Regards,

    Tom

     

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  • lunedì 14 maggio 2012 13:06
     
     
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    Does memory actually leak? I mean do you have page locked memory size INCREASING all the time or is it changing in both directions?

    -nismo

     
  • lunedì 14 maggio 2012 14:04
     
     
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    Hello Nismo,

    it's increasing and decreasing.. so it's going both ways.


    • Modificato TomRaus lunedì 14 maggio 2012 14:06
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  • giovedì 17 maggio 2012 07:24
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    Hi,

    Please try to use Resource Monitor to check whether there are any processes cause the high usage of the memory.

    Using Resource Monitor to Troubleshoot Windows Performance Issues Part 1
    http://blogs.technet.com/b/askperf/archive/2012/02/01/using-resource-monitor-to-troubleshoot-windows-performance-issues-part-1.aspx

     
  • venerdì 18 maggio 2012 11:51
     
     
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    Hello Vincent,

    No you cannot see where the memory goes in Task Manager or in Resource Monitor. The only way to see it is by using RAMMAP.

     
  • mercoledì 11 luglio 2012 18:19
     
     
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    Hi, 

    I have the same issue. In RamMap I see 18 Gb consumed by Driver locked. I have Hyper-V installed as well. 

    Any idea how to solve it?! I have 24 Gb RAM which is apparently not being used at all! 

    

     
  • venerdì 3 agosto 2012 18:22
     
     
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    I'm having the same issue. Has anyone come across anything?
     
  • martedì 25 dicembre 2012 06:11
     
     
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    I had the same issue in Hyper-V 2012. I disabled dynamic memory on the guest VM and the issue has not come back. It's only been a few days so I am not sure if this definitively fixed the issue or it's simply yet to reemerge but it's something.
     
  • mercoledì 15 maggio 2013 10:33
     
     
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    I am facing same issue.

    Please help.

     
  • martedì 21 maggio 2013 14:33
     
     
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    I have the same issue.  My workstation is windows 7 64bit and running on Hyper-V 2012 by dynamic memory.


    • Modificato FredYU martedì 21 maggio 2013 14:33
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