Hi Tal, as I thought: You have a newer AMD processor and Windows returns the wrong number of cores for your CPU: It returns 1 when your CPU has 4 physical cores. We use a Windows system function to determine the number of physical cores. I think that's a Windows bug and we need to find a workaround. To be able to assign more guest CPUs to your VMs you can use 'VBoxManage modifyvm VM_NAME --cpus ...'.
Kind regards, Frank On Friday 27 December 2013 16:20:29 Tal Aloni wrote: > Thanks Frank, > I've attached the two log files (from 4.2.20 and 4.3.6). > > Tal > > ----- Original Message ----- > From: "Frank Mehnert" <[email protected]> > To: <[email protected]> > 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. > > Thanks, > > Frank -- Dr.-Ing. Frank Mehnert | Software Development Director, VirtualBox ORACLE Deutschland B.V. & Co. KG | Werkstr. 24 | 71384 Weinstadt, Germany Hauptverwaltung: Riesstr. 25, D-80992 München Registergericht: Amtsgericht München, HRA 95603 Geschäftsführer: Jürgen Kunz Komplementärin: ORACLE Deutschland Verwaltung B.V. Hertogswetering 163/167, 3543 AS Utrecht, Niederlande Handelsregister der Handelskammer Midden-Niederlande, Nr. 30143697 Geschäftsführer: Alexander van der Ven, Astrid Kepper, Val Maher
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