VirtualBox 4.2.4 on FreeBSD 9.1-PRERELEASE problem: VMs behave very different when pinned to different cores

[Konstantin Belousov]

On Wed, Nov 28, 2012 at 05:24:35PM +0200, Andriy Gapon wrote:
> on 26/11/2012 09:10 Alex Chistyakov said the following:
> > CPU: Intel(R) Core(TM) i7-3930K CPU @ 3.20GHz (3200.18-MHz K8-class CPU)
> >   Origin = "GenuineIntel"  Id = 0x206d7  Family = 0x6  Model = 0x2d
> > Stepping = 7
> > Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
> > Features2=0x1fbee3bf<SSE3,PCLMULQDQ,DTES64,MON,DS_CPL,VMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,PCID,DCA,SSE4.1,SSE4.2,x2APIC,POPCNT,TSCDLT,AESNI,XSAVE,OSXSAVE,AVX>
> >   AMD Features=0x2c100800<SYSCALL,NX,Page1GB,RDTSCP,LM>
> >   AMD Features2=0x1<LAHF>
> >   TSC: P-state invariant, performance statistics
> > 
> 
> Is this a multi-socket system?
> 
> It would be very strange that a modern CPU like this would have such a skew
> between TSC on different cores.
> 
> On my Core i5-3570 I see that the _observed_ skew is no more than 100 ticks (after
> many days of uptime).  It could be zero, in fact, given the inaccuracy of
> inter-core measurements.

I believe that Cores have single TSC per package, located in uncore.
And Core i7 cannot work in multi-socket systems.
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