Re: smp question

["Kevin J. Cummings" <cummings@kjchome.homeip.net>]

Matías López Bergero wrote:
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> Kevin J. Cummings wrote:
> | Matías López Bergero wrote:
> |> I have a SMP capable server, but with only one cpu installed.
> |> Should I enable SMP support on the kernel? I'm trying to reach the best
> |> performance.
> |> The cpu is Intel Xeon, this option is not in the cpu list in the kernel
> |> config. Should I chose P4 or P3? it is the same?
> |
> | IIRC, Xeon processors have dual internal cores (or at least dual
> | instruction decode paths), and act like dual processors, and benefit
> | from the SMP kernels.  Also, IIRC, there were both P3 and P4 Xeons made.
> |  So, you have to know which version you have.
> |
> | What does "cat /proc/cpuinfo" tell you?
> |
> 
> I'm seeing two processors, I had notes this before, but I was in doubt
> if that output was produced by the SMP kernel, or the Xeon cpu, now
> according to what you are telling me, it's a feature of the Xeon cpu right?

If I remember Correctly, yes, its a feature of the XEON CPU.  (I have 
athlons here at home!)

> Here is my cpuinfo:
> 
> sh-2.05b# cat /proc/cpuinfo
> processor       : 0
> vendor_id       : GenuineIntel
> cpu family      : 15
> model           : 2
> model name      : Intel(R) Xeon(TM) CPU 2.80GHz

This looks like a P4 Xeon: 2.80GHz speed

> stepping        : 9
> cpu MHz         : 2800.195
> cache size      : 512 KB
> physical id     : 0
> siblings        : 2

Yeup, looks like 2 instruction pipelines.

> runqueue        : 0
> 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        : 5583.66

And the second "processor":

> processor       : 1
> vendor_id       : GenuineIntel
> cpu family      : 15
> model           : 2
> model name      : Intel(R) Xeon(TM) CPU 2.80GHz
> stepping        : 9
> cpu MHz         : 2800.195
> cache size      : 512 KB
> physical id     : 0
> siblings        : 2
> runqueue        : 0
> 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        : 5596.77
> 
> sh-2.05b#
> 
> Thanks for ur help Kevin!

NP

-- 
Kevin J. Cummings
kjchome@rcn.com
cummings@kjchome.homeip.net
cummings@kjc386.framingham.ma.us
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