[CentOS] Re: 64 Bit?
Scott Silva
ssilva at sgvwater.com
Mon May 21 18:05:58 UTC 2007
drew einhorn spake the following on 5/21/2007 10:30 AM:
> Thanks, Is there a guide somewhere on how to read the cpu info.
>
> I do remember seeing stuff about hyperthreading on this box.
> Does hyperthreading imply 64 bit.
>
> Here's the cpu from another box that has hyperthreading, but I
> was assuming it was not 64 bit. Can I run a 64-bit kernel on this one?
> processor : 0
> vendor_id : GenuineIntel
> cpu family : 15
> model : 2
> model name : Intel(R) Pentium(R) 4 CPU 3.40GHz
> stepping : 5
> cpu MHz : 3392.058
> cache size : 2048 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 pbe up
> cid xtpr
> bogomips : 6789.18
>
>
> On 5/21/07, Scott Silva <ssilva at sgvwater.com>
> wrote:
>> drew einhorn spake the following on 5/21/2007 9:45 AM:
>> > Once again there's stuff I understand and more stuff I really don't
>> > understand. I think the answer is: "This is not a 64-bit CPU, but I'm
>> > not 100% sure.
>> >
>> > Interesting /proc/cpuinfo is slightly different on the hostOS for
>> > VMware ESX Server, an
>> > odd proprietary cousin of Red Hat, and a CentOS5 x86 VM.
>> >
>> > here's the info from the host OS cpu
>> >
>> > processor : 0
>> > vendor_id : GenuineIntel
>> > cpu family : 15
>> > model : 4
>> > model name : Intel(R) Xeon(TM) MP CPU 3.16GHz
>> > stepping : 1
>> > cpu MHz : 3169.453
>> > cache size : 1024 KB
>> > 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 sep mtrr pge
>> > mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss tm lm
>> > bogomips : 6330.77
>> >
>> > Hmm. There's two processors in there with sockets for more. But I
>> > only see info for one
>> > CPU.
>> >
>> > and heres the info from the Guest
>> >
>> > processor : 0
>> > vendor_id : GenuineIntel
>> > cpu family : 15
>> > model : 4
>> > model name : Intel(R) Xeon(TM) MP CPU 3.16GHz
>> > stepping : 8
>> > cpu MHz : 3169.074
>> > cache size : 1024 KB
>> > 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 dts acpi mmx fxsr sse sse2 ss constant_tsc up
>> > pni ds_cpl
>> > bogomips : 6441.62
>> That should be a 64 bit hyperthreaded processor
No, hyperthreading does not imply 64 bits, but that model Xeon is an EMT64
processor. I just happen to know because I have a couple in service. I don't
think you will be able to run 64 bit guests though. You need a newer processor
with the VT option.
This is the most reliable method to ID an Intel processor;
http://support.intel.com/support/processors/tools/piu/sb/CS-015823.htm
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