Messages in this thread | | | Subject | Re: Kernel reports 4 CPUS instead of 2... | From | Mark Chernault <> | Date | 16 Oct 2002 18:34:54 -0600 |
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On Wed, 2002-10-16 at 17:21, Bryan Whitehead wrote: > My /proc/cpuinfo says I have ht CPU's... but i only see 2 CPU's... (Yet > I have 2 1.7Ghz XEONs in the box so shouldn't I see 4?) > > It's a Dell Precisions 530 workstation. > > Does intel have ht CPU's that are messed up? and I'm one of the "lucky > ones". ?
Intel lists the Xeon with a 256KB cache as a workstation processor, and indicate that it doesn't do hyperthreading. They indicate that you need to buy the higher end Xeons to use hyperthreading. I don't know if this is similar to AMD and the Athlon XP, Athlon MP; or, they really don't do hyperthreading.
If someone knows how to get hyperthreading working on Xeons with a 256KB cache I'd love to know. We have a cluster of these running on SuperMicro P4DC6's that I'd like to try hyperthreading on. The motherboards don't have a bios setting for hyperthreading though.
http://www.intel.com/design/Xeon/prodbref/
> > Building a kernel myself did not help... Any idea's? > > [driver@mulan ~]$ cat /proc/cpuinfo > processor : 0 > vendor_id : GenuineIntel > cpu family : 15 > model : 1 > model name : Intel(R) Xeon(TM) CPU 1.70GHz > stepping : 2 > cpu MHz : 1694.863 > cache size : 256 KB > fdiv_bug : no > hlt_bug : no > f00f_bug : no > coma_bug : no > fpu : yes > fpu_exception : yes > cpuid level : 2 > wp : yes > flags : 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 ht tm > bogomips : 3381.65 > > processor : 1 > vendor_id : GenuineIntel > cpu family : 15 > model : 1 > model name : Intel(R) Xeon(TM) CPU 1.70GHz > stepping : 2 > cpu MHz : 1694.863 > cache size : 256 KB > fdiv_bug : no > hlt_bug : no > f00f_bug : no > coma_bug : no > fpu : yes > fpu_exception : yes > cpuid level : 2 > wp : yes > flags : 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 ht tm > bogomips : 3381.65 > > > Richard B. Johnson wrote: > > On Wed, 16 Oct 2002, Mark Cuss wrote: > > > > > >>Hello all > >> > >>I'm working with a new Dell Poweredge 4600 Server with Dual CPUs. However, > >>Linux reports that it sees 4 CPUs... I have opened the thing to see if Dell > >>gave me 2 extras for free, but no luck: Attached is /proc/cpuinfo. > >> > >>I've tried the RedHat 8.0 stock kernel, as well as a freshly compiled 2.4.19 > >>but both exhibit the same behavior. > >> > >>The specifics on the machine: > >> > >>Dual Xeon 2.2 GHz CPUs (512 k L2 cache) > >>2 Gigs DDR RAM > >>The chipset is a ServerWorks CMIC-HE (see attached lspci for complete > >>listing). > >> > >>Has anyone else seen this behavior? The only other SMP machine I have is an > >>older Dell server with Dual 1 GHz coppermines, and it reports 2 CPUs... > >> > >>Any information or advice is greatly appreciated... > >> > >>Thanks in Advance, > >> > >>Mark > >> > > > > > > This has become a FAQ. The processors are capable of so-called > > "hyperthreading". They have two execution units, therefore seem > > like two CPUs. > > > > This is the correct behavior. If you don't like this, you can > > swap motherboards with me ;) Otherwise, grin and bear it! > > > > > > Cheers, > > Dick Johnson > > Penguin : Linux version 2.4.18 on an i686 machine (797.90 BogoMips). > > The US military has given us many words, FUBAR, SNAFU, now ENRON. > > Yes, top management were graduates of West Point and Annapolis. > > > > - > > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > > the body of a message to majordomo@vger.kernel.org > > More majordomo info at http://vger.kernel.org/majordomo-info.html > > Please read the FAQ at http://www.tux.org/lkml/ > > > -- > Bryan Whitehead > SysAdmin - JPL - Interferometry Systems and Technology > Phone: 818 354 2903 > driver@jpl.nasa.gov > > - > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ > -- Mark Chernault <marchern@cs.nmsu.edu> Technical Assistant, COG, CS Dept., NMSU
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