Detection of HTT
Scott Long
scottl at freebsd.org
Mon Nov 15 20:11:19 PST 2004
Intel is claiming that your CPU has the registers that will let software
easily find out how many logical cores you have.
Scott
Wilkinson, Alex wrote:
> Yes you're right ! This sux ! What the hell is Intel claiming that I have a
> HTT capable CPU, but really I have only 1 core !
>
>
> shell> sudo x86info -f
>
> x86info v1.12b. Dave Jones 2001-2003
> Feedback to <davej at redhat.com>.
>
> Found 1 CPU
> --------------------------------------------------------------------------
> Family: 15 Model: 2 Stepping: 9 Type: 0 Brand: 9
> CPU Model: Pentium 4 (Northwood) [D1] Original OEM
> Processor name string: Intel(R) Pentium(R) 4 CPU 2.80GHz
>
> Feature flags:
> fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36
> clflsh dtes acpi mmx fxsr sse sse2 selfsnoop ht acc pbe
> Extended feature flags:
> cntx-id
> Instruction TLB: 4K, 2MB or 4MB pages, fully associative, 128 entries.
> Data TLB: 4KB or 4MB pages, fully associative, 64 entries.
> L1 Data cache:
> Size: 8KB Sectored, 4-way associative.
> line size=64 bytes.
> No level 2 cache or no level 3 cache if valid 2nd level cache.
> Instruction trace cache:
> Size: 12K uOps 8-way associative.
> L2 unified cache:
> Size: 512KB Sectored, 8-way associative.
> line size=64 bytes.
> Number of logical processors supported within the physical package: 0
>
> - aW
>
>
> 0n Tue, Nov 16, 2004 at 12:38:05PM +1030, Michael Nottebrock wrote:
>
> On Tuesday, 16. November 2004 02:41, Wilkinson, Alex wrote:
> > Is it possible to find out whether HTT is turned on in the BIOS
> without
> > having to reboot ? acpidump(8) ?
> >
> > It's just that I notice that I have a HTT capable CPU:
> >
> > CPU: Intel(R) Pentium(R) 4 CPU 2.80GHz (2793.19-MHz 686-class CPU)
> > Origin = "GenuineIntel" Id = 0xf29 Stepping = 9
> >
> >
> Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE
> ,MC
> >A,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS, HTT,TM,PBE>
>
> Not all CPUs that advertise 'HTT' do actually offer multiple logical
> processors. sysutils/x86info is a nice utility which can provide this
> information ...
>
> --
> ,_, | Michael Nottebrock | lofi at freebsd.org
> (/^ ^\) | FreeBSD - The Power to Serve | http://www.freebsd.org
> \u/ | K Desktop Environment on FreeBSD | http://freebsd.kde.org
>
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