[Gllug] Is it me or are the CPUs getting slower?

[Rhys Powell]

John Winters wrote:
> On Fri, 2006-06-02 at 16:37 +0000, Andy Smith wrote:
> 
>>On Fri, Jun 02, 2006 at 05:06:44PM +0100, John Winters wrote:
>>
>>>I've booted an x86 live CD and that reports the same CPU speed (1 GHz)
>>>and Bogomips (~2000).
>>>
>>>So, my questions are:
>>>
>>>1) Does an Athlon 64 3000+ really only run at 1 GHz?
>>
>>No.  It runs at about 1.8Ghz and should show about 3600 bogomips, at
>>full speed.
> 
> 
> Well, that was my recollection - hence my surprise.
> 
> 
>>>2) If not, what might have slowed mine down and how can I speed it up
>>>again?
>>
>>At a guess you have CPU frequency scaling enabled and so it slowed
>>itself down as it has no work to do?
> 
> 
> That's an interesting suggestion.  When I first booted up Ubuntu I
> thought I saw a menu option entitled "CPU frequency scaling" but now I
> go and hunt for it it doesn't seem to be there.  Did I imagine it (and
> if so, how did I get the name so right)?
> 
> 
>>  In which case speeding it up
>>will be pointless unless you want a bigger electricity bill and a
>>computer that does nothing, faster. :)
> 
> 
> Well, if the CPU speed is now dynamic I'll be delighted.  It's a new one
> on me though.
> 
> 
>>You could prove this by running a tight loop to see if it speeds up.
>>e.g. the "yes" shell command.
> 
> 
> You seem to have rung the bell and won a prize there.  I set sshd to
> installing (so I could access the machine remotely) and whilst it was
> generating the crypto keys, a quick "cat /proc/cpuinfo" showed the CPU
> at 1.8 GHz.  So, something appears to be working as it should, but can
> anyone tell me what?  What are these "services" which someone else
> mentioned?
> 
Looking at Ubuntu it does appear that cpufreq is what is used some where 
like
/sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies

also in there there should be a scaling_available_governors

which are the controllers to the speed. How it all works not sure as 
I've not really had time to look at it. a quick google came up with the 
command

cpufreq-selector -f 1300000

this should manually change it to 1.3 though not had a chance to test 
this as I can get to the box.

it does appear that cpuspeed is a redhat/fedora thing.

Cheers

Rhys
> TIA,
> John
> 


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