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Date: Wed, 28 Nov 2012 18:34:23 +0300
Message-ID: <CA+kq2xvGhWBVEPomBnRkfa0em8woi6qBzSFX9hiUSNH-+d8-3g@mail.gmail.com>
Subject: Re: VirtualBox 4.2.4 on FreeBSD 9.1-PRERELEASE problem: VMs behave
 very different when pinned to different cores
From: Alex Chistyakov <alexclear@gmail.com>
To: Andriy Gapon <avg@freebsd.org>
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Cc: "freebsd-emulation@freebsd.org" <freebsd-emulation@freebsd.org>,
 Alexander Motin <mav@freebsd.org>
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On Wed, Nov 28, 2012 at 7:24 PM, Andriy Gapon <avg@freebsd.org> 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?

No, this is a single-socket desktop grade baseboard, Intel DX79TO.

Thank you,

--
SY,
Alex


>
> 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.
>
> --
> Andriy Gapon