[vbox-dev] Can't use more than one vCPU after upgrading toVirtualBox 4.3.x

Tal Aloni tal.aloni.il at gmail.com
Fri Dec 27 15:20:29 UTC 2013

Thanks Frank,
I've attached the two log files (from 4.2.20 and 4.3.6).


----- Original Message ----- 
From: "Frank Mehnert" <frank.mehnert at oracle.com>
To: <vbox-dev at virtualbox.org>
Sent: Friday, December 27, 2013 4:28 PM
Subject: Re: [vbox-dev] Can't use more than one vCPU after upgrading toVirtualBox 4.3.x

Hi Tal,

On Thursday 26 December 2013 16:52:34 Tal Aloni wrote:
> I have an AMD A8-3850 CPU, which have 4 cores.
> I noticed that v4.3.0 introduced some changes to the CPU core detection
> mechanism, unfortunately, it does not work too well for my CPU, and I can
> no longer present more than 1 vCPU to each virtual machine (with 4.2.x I
> could assign up to 4).
> I'll be glad to provide additional information and tests beta builds if
> necessary, Thanks,

indeed, VBox 4.3.x changed the detection of the number of CPU cores. Could
you provide me a VBox.log file of a VM session? That log file will provide
some more information about your host CPU.


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