David Vengerov wrote:
> Can someone please help me figure out if xeon.sfbay can be used for 
> studying how DVFS works? The site  
> http://blogs.sun.com/mhaywood/entry/introducing_speedstep_on_solaris 
> suggests that Intel Xeon is capable of supporting several frequencies. 
> However, when I run "kstat -m cpu_info -s supported_frequencies_Hz", I 
> get the following:
>
> module: cpu_info                        instance: 0
> name:   cpu_info0                       class:    misc
>        supported_frequencies_Hz        1793370470
>
> module: cpu_info                        instance: 1
> name:   cpu_info1                       class:    misc
>        supported_frequencies_Hz        1793370470
>
> module: cpu_info                        instance: 2
> name:   cpu_info2                       class:    misc
>        supported_frequencies_Hz        1793370470
>
> module: cpu_info                        instance: 3
> name:   cpu_info3                       class:    misc
>        supported_frequencies_Hz        1793370470

Yes, However that same blog also  says:

"Enhanced Intel SpeedStep on Solaris is only supported on systems 
running Intel processors that belong to Family 0xF - Models >=0x3 or 
Family 0x6 - Models >= E."

$ kstat -m cpu_info -s implementation
module: cpu_info                        instance: 0    
name:   cpu_info0                       class:    misc
        implementation                  x86 (chipid 0x0 GenuineIntel F27 
family 15 model 2 step 7 clock 1793 MHz)

module: cpu_info                        instance: 1    
name:   cpu_info1                       class:    misc
        implementation                  x86 (chipid 0x3 GenuineIntel F27 
family 15 model 2 step 7 clock 1793 MHz)

module: cpu_info                        instance: 2    
name:   cpu_info2                       class:    misc
        implementation                  x86 (chipid 0x0 GenuineIntel F27 
family 15 model 2 step 7 clock 1793 MHz)

module: cpu_info                        instance: 3    
name:   cpu_info3                       class:    misc
        implementation                  x86 (chipid 0x3 GenuineIntel F27 
family 15 model 2 step 7 clock 1793 MHz)

Notiice that these CPUs are Family F Model 2. Yes, there are different 
Xeon models. And that is the reason that we list our support by 
family/model rather than by makreting name.

Mark

>
> which suggests that only one frequency is supported. The kernel 
> version is: SunOS 5.11 snv_79. Is it possible that a later version of 
> Nevada is required for DVFS?
>
> Thanks,
>
> David
>
>
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