virtualbox.org

Hi,

Problem: Guest OS only sees 1 CPU, instead of the 4 I have assigned to it.
Host: Windows 7 64-bit, Intel Core I7 (8 CPUs), 8 GB RAM
Guest: Debian testing 32-bit, Intel Core I7 (4 CPUs), 2 GB RAM
VirtualBox Version: 4.3.6r91406
Guest Additions: Installed (4.3.6r91406)
Hardware Virtualisation: Enabled
Additional Information: Please see Log and Screenshot attached

Description:
My Debian testing guest system only sees 1 CPU, out of the 4 that I have assigned.
Everything looks fine on the VirtualBox side of things (but please check my Log), but when I am inside my Debian guest system, this is what I see:

Code: Select all

$ ls /sys/devices/system/cpu/
cpu0  cpuidle  kernel_max  microcode  modalias  offline  online  possible  power  present  uevent

$ cat /sys/devices/system/cpu/online 
0

$ cat /sys/devices/system/cpu/offline 

$ cat /sys/devices/system/cpu/present 
0

$ cat /proc/cpuinfo 
processor	: 0
vendor_id	: GenuineIntel
cpu family	: 6
model		: 42
model name	: Intel(R) Core(TM) i7-2820QM CPU @ 2.30GHz
stepping	: 7
cpu MHz		: 2272.671
cache size	: 6144 KB
fdiv_bug	: no
f00f_bug	: no
coma_bug	: no
fpu		: yes
fpu_exception	: yes
cpuid level	: 5
wp		: yes
flags		: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht nx rdtscp constant_tsc pni ssse3
bogomips	: 4545.34
clflush size	: 64
cache_alignment	: 64
address sizes	: 36 bits physical, 48 bits virtual
power management:

Is there anything I can do to solve this issue? This is massively important for me and I would really appreciate any help. Please let me know if I need to provide any additional information.

Thank you very much.

00:00:00.531694 Guest OS type: 'Debian'

Shut the guest down ( not saved state ) and select the 64-bit version in the settings.

Hi Perryg,

Thanks for your help.
I did that, but the situation hasn't changed, there's always only one cpu visible to Debian.
Please note that I installed the 32-bit version of Debian, is this a problem?

Cheers,

It could, depending on the kernel. For instance the i486 version kernel is not compiled to support SMP. You would need to investigate Debian SMP to be sure.

That was it! THANK YOU.
I think I installed Debian with PAE disabled, so the installer automatically installed the 486 kernel (that doesn't support SMP) instead of the 686-pae one.
I installed it, rebooted and now I can see the 4 cores from Debian.

Is there any way to transform my virtual 32-bit to a 64-bit installation? For example If I select Debian(64 bit) from the list and the install the amd64 kernel, would that give me a 64-bit OS?

In theory this could be done, but I believe the 32-bit libs, and lack of 64-bit libs, will cause you a lot of grief. Best to install 64-bit fresh.

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