How to enable Ext. features in VirtualBox?

[wishedtobe]

e.g. 1GB page. Since I saw these labels in the log file, there must be some means to activate this to some extent.

[Octocontrabass]

Is your host Windows? If so, try disabling Hyper-V.

[wishedtobe]

Is your host Windows? If so, try disabling Hyper-V.

It doesn't work. As far as I can see, once this line appears in the log, the large page can be enabled.

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HM: HMR3Init: Attempting fall back to NEM: VT-x is not available

From this perspective, it's VT-x that causes its incompatibility, not Hyper-v. But how can Vbox run without virtualization?

[wishedtobe]

https://docs.oracle.com/en/virtualizati ... ifyvm.html

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--largepages on|off: If hardware virtualization and nested paging are enabled, for Intel VT-x only, an additional performance improvement of up to 5% can be obtained by enabling this setting. This causes the hypervisor to use large pages to reduce TLB use and overhead.

I wonder if this is helpful.

[Octocontrabass]

As far as I can see, once this line appears in the log, the large page can be enabled.

You mean can't be enabled, right?

But how can Vbox run without virtualization?

VirtualBox can't run 64-bit guests without hardware virtualization. If VT-x isn't available, VirtualBox is using Hyper-V.

[wishedtobe]

You mean can't be enabled, right?

I won't focus on the logs. Only by enabling it(1gb) myself, by software operation, can I know if he actually enabled it or not.

[wishedtobe]

It's of no avail. Whether I have disabled Hv or not, it gives me a VERR_PAGE_TABLE_NOT_PRESENT if PSE flag set in PDPTE.

[Octocontrabass]

Is Hyper-V actually disabled? According to some posts on the VirtualBox forums, Hyper-V may still be enabled even after you follow the normal procedure for disabling it.

[wishedtobe]

https://docs.oracle.com/en/virtualizati ... ifyvm.html

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--largepages on|off: If hardware virtualization and nested paging are enabled, for Intel VT-x only, an additional performance improvement of up to 5% can be obtained by enabling this setting. This causes the hypervisor to use large pages to reduce TLB use and overhead.

I wonder if this is helpful.

Unfortunately, this function is enabled by default, and it's apparently useless.

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Vboxmanage modifyvm $vm --cpuidset

This command is used to pretend that 1GB was already enabled, but of course it didn't work.

[wishedtobe]

https://forums.virtualbox.org/viewtopic.php?p=515565

This log message indicates that the host OS already refuses to provide a 2 MB "large" page and forces VirtualBox to allocate smaller 4 kB pages, which is somewhat unusual that early.

So "largepage" is not 1gb page.The plan already exists, but the functionality is not yet complete, so there's a

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Page1GB - 1 GB large page                               = 0 (1)

[wishedtobe]

Is your host Windows? If so, try disabling Hyper-V.

It works correctly on my Linux machine within VirtualBox.

This may be the key. Virtual box + Windows + 1gb paging may not be supported.