Ticket #18079 (new defect)

Opened 7 months ago

Last modified 7 months ago

Incorrect CPU cores detection

Reported by: VasilyL Owned by:
Component: VMM Version: VirtualBox 5.2.20
Keywords: CPU, core, SVM, AMD-V Cc: vld10@…
Guest type: Linux Host type: Windows


I have a AMD FX-4100. It's a quad core CPU. I've created new VM for Live Linux. GUI detects only 2 cores. If I try to setup more than 2 cores for VM, GUI says that I've setup more cores, that physically available. I tried to downgrade and gone down all way to somewhere around 4.2.20. GUI there detects cores normally, but when starting VMS it fails with "AMD-V is disabled in the BIOS. (VERR_SVM_DISABLED)." which is not true. Is it possible to fix cores detection by GUI? VM itself seems using all 4 cores.


VBox.log Download (132.3 KB) - added by VasilyL 7 months ago.
VBox.log_4.0.8 Download (66.5 KB) - added by VasilyL 7 months ago.
Error of 4.0.8 version

Change History

Changed 7 months ago by VasilyL

Changed 7 months ago by VasilyL

Error of 4.0.8 version

comment:1 Changed 7 months ago by VasilyL

If you have a significant slowdown of guest VM (and the more cores you set - slower it is) - you should try to disable software, which may also use virtualization. In my case it's a sandbox of Avast antivirus: turn off via settings - compatibility - unchecking some checkboxes will help.

comment:2 Changed 7 months ago by socratis

Are you running VirtualBox 4.0.8? From 2011? 7 years ago? How about updating first to something that's more... today?

As of today, the current version is 5.2.20. Please update first and see if the error is still there.

EDIT: I missed the 1st log, I just saw the 1st one for a reason, sorry about that...

Last edited 7 months ago by socratis (previous) (diff)
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