High CPU using Windows 10 Version 1803 as host and guest

Discussions related to using VirtualBox on Windows hosts.

Re: High CPU using Windows 10 Version 1803 as host and guest

Postby ckorh » 21. Jul 2018, 17:16

I'm having the same issue, Windows 10 Host and guest, both 1803, 18% CPU idle.

The weird thing is that if I start a second VM (Ubuntu 32 bits), the CPU goes down to normal. :-)

As soon as I power it down, CPU back yo 18%..
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Re: High CPU using Windows 10 Version 1803 as host and guest

Postby ardatun » 23. Jul 2018, 15:11

@Simple07,

It's been 2 days and it seems ok with drag&drop disabled.
If it solves the problem I 'll keep these settings.
Thanks anyway
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Re: High CPU using Windows 10 Version 1803 as host and guest

Postby CoreDima » 25. Jul 2018, 03:35

In my case, the problem was fixed by randomly switching to the ICH9 chipset.
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Re: High CPU using Windows 10 Version 1803 as host and guest

Postby ed10k » 25. Jul 2018, 20:19

At long last the problem is gone.
The solution is: PIIX3 -> ICH9 !!!
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Re: High CPU using Windows 10 Version 1803 as host and guest

Postby steveoracle » 24. Aug 2018, 20:10

Changing the CPU type worked for me too! I had a constant 25% to 30% being used on the host with the guest idling at about 5%.

Settings -> System -> Chipset: ICH9
Host OS: Mac High Sierra 10.13.6
Guest: Windows 10

The guest has GA installed with 2D and 3D acceleration on in case this helps anyone else out there.
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Re: High CPU using Windows 10 Version 1803 as host and guest

Postby socratis » 24. Aug 2018, 21:09

Please do NOT use the ICH9 chipset, something that is:
  1. For OSX-guests only,
  2. Clearly labelled as experimental,
  3. Most probably going to create more problems down the line to other PCI peripherals, and
  4. Going to be the first thing that a developer, administrator, moderator or volunteer is going to tell you to change.
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Re: High CPU using Windows 10 Version 1803 as host and guest

Postby michal.kozal » 29. Aug 2018, 12:46

PIIX3 chipset, WIn10 64 host & guest
1 CPU assigned - constant 25-30% CPU usage (I have 4t/8c CPU) on host
2 CPUs assigned - 0.7-63.6% depending on the load, but mostly idling

So instead of changing chipset to unsupported which is terrible idea just assign one core more
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Re: High CPU using Windows 10 Version 1803 as host and guest

Postby mhanor » 29. Aug 2018, 15:27

You can also start a paused VM, it's enough to lower the CPU usage of the first VM.
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Re: High CPU using Windows 10 Version 1803 as host and guest

Postby SFtec » 24. Dec 2018, 09:57

Hello everyone,
Just for information, I had exactly the same problem.
My host is running Windows 10 Pro 1809 and my guest too.
My CPU was always over 40% ...

After reading this topic, I decided to test the solution of the switch from Chipset parameter PIIX3 to ICH9 even if some people do not recommend it.
(A little fearful snapshot done beforehand.)

Result: All my problems are solved!
Well, that's just me.
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Re: High CPU using Windows 10 Version 1803 as host and guest

Postby maxchen » 15. Jan 2019, 13:20

PIIX3 -> ICH9, the right answer!

It cost me 2 full days. In a new computer, I use VB 6.0.0 and Windows 10 LTSC 2019 as guest. I try a few test, say, down-graded VB to version 5; down to win 10 LTSB 2016, etc
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Re: High CPU using Windows 10 Version 1803 as host and guest

Postby folj » 20. Jan 2019, 23:57

Hello.
The problem remained after upgrading the guest to v1809, but following the suggestion posted a few posts above, I was able to solve my problem by increasing the number of virtual CPU's from 1 to 2.
Host CPU draw went from 30% minimum to idling at 2% (and 65% maximum).
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Re: High CPU using Windows 10 Version 1803 as host and guest

Postby cb20777 » 28. Mar 2019, 05:39

I too have encountered this problem (although with Windows 1809). It seems that there are 3 workarounds listed in this thread:
  1. Disable Drag and Drop - Already disabled on my system, so not useful for me.
  2. Ensure more than one virtual core always running - I only have two cores to begin with.
  3. Change PIX3 -> ICH9 - the moderator really hates this

This leave me with two bad options: allocate lots of virtual cores when I have precious few physical cores OR make a change that the moderator predicts will end badly.

This dilemma raises the following questions

  1. Has a formal Oracle problem ticket been generated for this issue? (For it clearly is a problem)
  2. Has the root cause been identified?
  3. Is it considered a VirtualBox bug, or is VIrtualBox just emulating something that a recent change in Win10 has made very CPU intensive to emulate? If the later, are there plans to improve the emulator performance?
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Re: High CPU using Windows 10 Version 1803 as host and guest

Postby socratis » 28. Mar 2019, 08:23

cb20777 wrote:This dilemma raises the following questions

And here are my answers to your questions:
  1. This is just the query for "High CPU", you could think of a bunch of other similar queries: https://www.virtualbox.org/query?status ... r=priority
  2. Hardly. It's not reproducible easily, there's got to be something that triggers this, only that "something" seems to be elusive... I can't reproduce it for example.
  3. Can't tell without the previous point being clearly identified.
Specifically for your last question, my freshly installed physical Win10 goes crazy every time I boot it, and whenever it gets a chance. Mostly it's .NET optimization, whatever the heck they're optimizing in there...
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Re: High CPU using Windows 10 Version 1803 as host and guest

Postby mhanor » 28. Mar 2019, 23:37

The issue reported here is easily reproducible and refers to high CPU usage on the host, while the guest is idling.
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Re: High CPU using Windows 10 Version 1803 as host and guest

Postby socratis » 29. Mar 2019, 00:20

mhanor wrote:The issue reported here is easily reproducible

I'd love to reproduce it, honestly to $DEITY. Tell me how, seriously. I can't. I have a Win7-32, Win7-64 and Win10-64 host (one of each, same computer really), but it doesn't do anything like that for me.

I can see the guest going crazy sometimes, but I know what's causing that; optimizations of .NET mostly when left idling. As soon as I get the focus on the VM, CPU drops.

But nothing that shows idle guest, 100% host.

And I don't think the title of the thread is "Idle guest, High CPU host" to begin with...
If you obfuscate any information requested, I will obfuscate my response. These are virtual UUIDs, not real ones.
Do NOT reply with the "QUOTE" button, please use the "POST REPLY", at the bottom of the form.
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