CentOS 5.3 doesn't detect more than one CPU

[Allan]

Linux guests cannot detect more than one cpu although Intel-VTx is enabled on the machine and there is no other hypervisor running on the box.

VBoxManage showvminfo vb340 | grep -i cpu Number of CPUs: 2 Synthetic Cpu: off CPUID overrides: None

inside the guest:

cat /proc/cpuinfo processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 15 model name : Intel(R) Core(TM)2 CPU 6400 @ 2.13GHz stepping : 2 cpu MHz : 2126.725 cache size : 0 KB physical id : 0 siblings : 1 core id : 0 cpu cores : 1 apicid : 0 fdiv_bug : no hlt_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 mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht constant_tsc up pni bogomips : 4253.45

There is only one!

[Frank Mehnert]

The real important information is that you enabled two guest CPUs. This would be even possible on a single-CPU host (well, the GUI would prevent that but VBoxManage would allow this). But one information is missing: Which guest Linux you are talking about (distribution plus exact version please)?

[Allan]

This is from the Host:

cat /proc/cpuinfo processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 15 model name : Intel(R) Core(TM)2 CPU 6400 @ 2.13GHz stepping : 2 cpu MHz : 1600.000 cache size : 2048 KB physical id : 0 siblings : 2 core id : 0 cpu cores : 2 apicid : 0 fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 10 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe lm constant_tsc pni monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr lahf_lm bogomips : 4253.06

processor : 1 vendor_id : GenuineIntel cpu family : 6 model : 15 model name : Intel(R) Core(TM)2 CPU 6400 @ 2.13GHz stepping : 2 cpu MHz : 1600.000 cache size : 2048 KB physical id : 0 siblings : 2 core id : 1 cpu cores : 2 apicid : 1 fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 10 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe lm constant_tsc pni monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr lahf_lm bogomips : 4252.90

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Guest is CentOS 5.3.

Please feel free to ask for any further information that may help with this.

[Frank Mehnert]

Ok. Do you know if this is a regression, that is, does VBox 3.0.12 has the same problem?

[Allan]

Sure, even as of earlier like 3.0.8. Also all current machines are built through an earlier version than 3.1.0

[Technologov]

Host: Mandriva Linux 2010, x64, Core 2 Q6600, VBox 3.2.0

Guest1: RHEL 5.3, 32-bit, 2 CPU

Guest2: RHEL 5.3, 64-bit, 2 CPU

Both guests detect SMP fine.

FIXED in 3.2.0

-Technologov