Windows 10 extremely slow on Virtualbox 6

Discussions about using Windows guests in VirtualBox.
Marco Sulla
Posts: 35
Joined: 14. Sep 2015, 23:48

Windows 10 extremely slow on Virtualbox 6

Post by Marco Sulla »

I recently created a Windows 10 guest on the latest Virtualbox 6.1 on Lubuntu 20.04. It was extremely slow. Since I already created a win10 guest on a Lubuntu machine without problems, I checked the version and I saw that it was Virtualbox 5.

So I installed Virtualbox 5 and now I'm installing the guest. It seems the speed is not a problem.

If you need other information for debugging, I'm ready to help.
scottgus1
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Joined: 30. Dec 2009, 20:14
Primary OS: MS Windows 10
VBox Version: PUEL
Guest OSses: Windows, Linux

Re: Windows 10 extremely slow on Virtualbox 6

Post by scottgus1 »

Marco Sulla wrote:It was extremely slow.
How so?

Between 5.y.x (there's 3 y's and tons of x's, so just '5' is not descriptive enough) and 6.y.x (ditto) there were several changes, including video. And maybe Windows 10 itself.

Do the following for both the version 5.y.x and 6.y.x VMs:

Start the VM from full power off, not save-state. Run until you see the problem happen, then shut down the VM from within the VM OS if possible. If not possible, close the Virtualbox window for the VM with the Power Off option set.

Please right-click the VM in the main Virtualbox window's VM list, choose Show Log. Save the far left tab's log, zip the log file, and post the zip file, using the forum's Upload Attachment tab.
Marco Sulla
Posts: 35
Joined: 14. Sep 2015, 23:48

Re: Windows 10 extremely slow on Virtualbox 6

Post by Marco Sulla »

I just discovered that the problem was not Virtualbox 6, but the number of CPU cores. If I set a number > 1, the guest will slow down a lot. I'll open another thread about it.
scottgus1
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Re: Windows 10 extremely slow on Virtualbox 6

Post by scottgus1 »

Very odd that 10 did not do well on 2 processors, it usually does. You can keep posting here on the subject, it still fits this topic, in my opinion.

But we need a vbox.log to get a solid foundation to work from.
Marco Sulla
Posts: 35
Joined: 14. Sep 2015, 23:48

Re: Windows 10 extremely slow on Virtualbox 6

Post by Marco Sulla »

Excuse me for the delay, here is the log:

https://pastebin.com/pcUxhgxt
mpack
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Re: Windows 10 extremely slow on Virtualbox 6

Post by mpack »

Marco Sulla wrote:If I set a number > 1, the guest will slow down a lot
IMO that only happens if you also disabled the Paravirtualization Interface (which should be set to "Default" or "Hyper-v" for a recent Windows guest).

Zip and attach logs locally. I'm willing to help out, but I'm not signing up to any services to do it.
Marco Sulla
Posts: 35
Joined: 14. Sep 2015, 23:48

Re: Windows 10 extremely slow on Virtualbox 6

Post by Marco Sulla »

mpack wrote:'m willing to help out, but I'm not signing up to any services to do it.
The link is public, I opened it with a private tab and I saw it.
I mean, it's pastebin, it's quite famous...
mpack
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Re: Windows 10 extremely slow on Virtualbox 6

Post by mpack »

Marco Sulla wrote: I mean, it's pastebin, it's quite famous...
I'm aware. I've already spent all the time attempting to navigate the pastebin site that I intend to.
scottgus1
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Re: Windows 10 extremely slow on Virtualbox 6

Post by scottgus1 »

@Marco Sulla, forum gurus won't go to third-party sites for logs and pictures that can be posted using the forum's Upload Attachment tab on the first day first post.

You received specific instructions above on how to post the log. If you want help, please follow them. If you don't wish to follow them, then we can all let this topic drop.
scottgus1 wrote:zip the log file, and post the zip file, using the forum's Upload Attachment tab.
And please don't forget:
scottgus1 wrote:Do the following for both the version 5.y.x and 6.y.x VMs:
Since 5,y,x performed well and 6.y.x did not, we need to see both logs to help.
Marco Sulla
Posts: 35
Joined: 14. Sep 2015, 23:48

Re: Windows 10 extremely slow on Virtualbox 6

Post by Marco Sulla »

The zip is attached. The logs are divided in two different folders.
Attachments
vbox_logs.zip
(49.14 KiB) Downloaded 13 times
mpack
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Posts: 39156
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Re: Windows 10 extremely slow on Virtualbox 6

Post by mpack »

First, you are not using VirtualBox - I'm afraid these forums only exist to support official Oracle VirtualBox releases, not third party builds such as the Ubuntu build you are using. This particularly matters when you are describing a performance problem, since the performance of third party builds simply isn't our concern.

Second, the 6.1.x log only shows 1 CPU core being assigned, making it difficult to diagnose the problem with multiple cores.

Please answer directly: what setting do you have for <VM settings>| System | Acceleration | Paravirtualization Interface.
Marco Sulla
Posts: 35
Joined: 14. Sep 2015, 23:48

Re: Windows 10 extremely slow on Virtualbox 6

Post by Marco Sulla »

I used the same settings from both the versions, so it's the 6.1 that automatically capped at 1 cpu for some reason.

How can I test the official Virtualbox on Linux?
Marco Sulla
Posts: 35
Joined: 14. Sep 2015, 23:48

Re: Windows 10 extremely slow on Virtualbox 6

Post by Marco Sulla »

Can I attach more information? Other logs, machine info, dmesg output.... I don't know.

PS: How can I test the official Virtualbox on Linux?
scottgus1
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Re: Windows 10 extremely slow on Virtualbox 6

Post by scottgus1 »

Marco Sulla wrote:How can I test the official Virtualbox on Linux?
You'd need to uninstall the Virtualbox you have now, then install the prerequisites https://www.virtualbox.org/manual/ch02. ... nux-prereq, then official Virtualbox https://www.virtualbox.org/wiki/Linux_Downloads
scottgus1
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Re: Windows 10 extremely slow on Virtualbox 6

Post by scottgus1 »

Paravirtualization Interface shows KVM in both logs, which would not be the correct setting. It should be 'Hyper-V'. I'm not sure if this would cause a slowdown, though it can't help.

The logs don't show any slow performance.
Marco Sulla wrote:If I set a number > 1, the guest will slow down a lot.
Neither log shows 2 processors, so we'd need a log with 2 processors for a decent comparison.
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