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Abnormally High Memory Usage with VMs

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(Double post....Sorry. Posted in wrong section)

 

My 2 gamers 1 PC build is essentially finished. Big thanks to everyone that's helped me with it in past posts.

 

But I have an issue with memory. The machine has 48GB. I've assigned each VM only 16GB. I had assigned more but the dashboard kept telling me the memory was maxing out and my VMs would crash. But I've got them down to 16 now, for a total of 32 out of 48 being requested, and the dashboards memory usage monitor keeps creeping up to 100% again.

 

Any ideas why this is happening?

Side note: Device manager in each VM has "PCI Device" and "PCI Simple Communicaions". Those drivers in the e drive where the ethernet driver was? Which one's are they?

 

Side note: Device manager in each VM has "PCI Device" and "PCI Simple Communicaions". Those drivers in the e drive where the ethernet driver was? Which one's are they?

Can't remember what the PCI device is, but PCI Simple Communications is a virtual serial port.  Just update the drivers and have Windows search the virtio ISO that you probably already have mounted for the appropriate drives
  • Author

I know my use of UNRAID is not the traditional use, but it's so close to working that I'm almost positive this can be resolved. It seems like a really weird issue. How could the server use more ram than its been alloted. The problem with this means that my VMs have to be shut down every so often to keep them from crashing.

did you set different values for your initial memory and max memory in your vm's?

  • Author

did you set different values for your initial memory and max memory in your vm's?

 

No. The guide I followed specifically said not to do that.

there is some overhead used for running the vm's in terms of ram, but not enough to cause that big of a difference (though with lots of ram, it uses more as a static percentage.) Anything else running on the system? Dockers?

 

can you post the xml of both the vm's?

  • Author

No Dockers or anything. I'll post the XML when I get home.

  • Author

Buddy of mine was just telling me he was having similar weird issues as me with 6.2.4. I don't know how I didn't see that there is now a version 6.3.1 when I did this. Think I'm just used to sourceforge which has latest download at the bottom of the list.

 

I made other mistakes last night with setup. So I'm going to go ahead and start from scratch tonight with 6.3.1 to see what happens.

  • Author

Rebuilt my setup completely from scratchwith 6.3.1 and everything seems to be normal. Both VMs set to 20GB RAM and dashboard sits at a steady 89% used.

 

Thanks for your help, everyone.

Rebuilt my setup completely from scratchwith 6.3.1 and everything seems to be normal. Both VMs set to 20GB RAM and dashboard sits at a steady 89% used.

 

Thanks for your help, everyone.

Running VM vs bare metal is very different, you may find giving each VM the bare minimum of RAM required for the apps they run and allowing the KVM host to use as much RAM as it can to speed up the emulation and file access of the guests will provide a better VM experience.
  • Author

Rebuilt my setup completely from scratchwith 6.3.1 and everything seems to be normal. Both VMs set to 20GB RAM and dashboard sits at a steady 89% used.

 

Thanks for your help, everyone.

Running VM vs bare metal is very different, you may find giving each VM the bare minimum of RAM required for the apps they run and allowing the KVM host to use as much RAM as it can to speed up the emulation and file access of the guests will provide a better VM experience.

 

Are you saying that I should leave unRAID with more than 11% (5GB) of leftover RAM to get better performance?

Rebuilt my setup completely from scratchwith 6.3.1 and everything seems to be normal. Both VMs set to 20GB RAM and dashboard sits at a steady 89% used.

 

Thanks for your help, everyone.

Running VM vs bare metal is very different, you may find giving each VM the bare minimum of RAM required for the apps they run and allowing the KVM host to use as much RAM as it can to speed up the emulation and file access of the guests will provide a better VM experience.

 

Are you saying that I should leave unRAID with more than 11% (5GB) of leftover RAM to get better performance?

I'm saying you should get both VM's going with the normal apps up and running, middle of a game or whatever, and check the task manager in each VM. Reduce the amount of RAM you assign to the VM's until the physical RAM available line gets down to 1G or so. The hypervisor will do a much better job managing the "extra" RAM to increase performance with caching than the VM will. You will probably find that the machine runs better with each VM assigned closer to 4GB, depending on the apps actually running of course.

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