Mailinglist Archive: opensuse (729 mails)

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Re: [opensuse] Re: CPU speed
  • From: Roger Oberholtzer <roger.oberholtzer@xxxxxxxxx>
  • Date: Wed, 3 Jun 2015 16:13:46 +0200
  • Message-id: <CANkOqwMs0=jLTXEsVH88v6W2KWxCHBppKgC2EsKsJSApcn-hWg@mail.gmail.com>
I don't know that I want to have the CPU run faster than is needed. I
would imagine that takes more power and generates more heat.
Presumably, if the CPU is doing something, the clock speed is
increased?

Maybe I will try for a bit and see if things seem snappier.

On Wed, Jun 3, 2015 at 3:32 PM, Malcolm <malcolmlewis@xxxxxxxxxxxx> wrote:
On Wed 03 Jun 2015 10:25:59 AM CDT, Roger Oberholtzer wrote:

I have a system (not a laptop) that has an "AMD Phenom(tm) II X6 1100T
Processor", as reported in /proc/cpuinfo. I have been monitoring the
CPU speed as reported there and I see that quite often the speed is
reported as 800 MHz instead of 3300 MHz. For example, I ran the four
commands pretty much one after the other. The speed is changing all
the time:

roger@acme:~> cat /proc/cpuinfo | grep "cpu MHz"
cpu MHz : 3300.000
cpu MHz : 3300.000
cpu MHz : 800.000
cpu MHz : 3300.000
cpu MHz : 3300.000
cpu MHz : 3300.000
roger@acme:~> cat /proc/cpuinfo | grep "cpu MHz"
cpu MHz : 800.000
cpu MHz : 3300.000
cpu MHz : 3300.000
cpu MHz : 800.000
cpu MHz : 3300.000
cpu MHz : 3300.000
roger@acme:~> cat /proc/cpuinfo | grep "cpu MHz"
cpu MHz : 800.000
cpu MHz : 800.000
cpu MHz : 800.000
cpu MHz : 800.000
cpu MHz : 3300.000
cpu MHz : 3300.000
roger@acme:~> cat /proc/cpuinfo | grep "cpu MHz"
cpu MHz : 800.000
cpu MHz : 2500.000
cpu MHz : 3300.000
cpu MHz : 800.000
cpu MHz : 3300.000
cpu MHz : 3300.000

The system is busy when this is run. So I cannot think there are
unused CPUs that are made to slow down because they have nothing to
do. Especially changing as often as they seem to be changing.

Is this expected behavior?

Hi
Run the command cpupower -c all frequency-info

If set to ondemand they will switch as required, it will also provide
info on boost states if applicable.

If you want to set to max frequency all the time set it to performance.

--
Cheers Malcolm °¿° LFCS, SUSE Knowledge Partner (Linux Counter #276890)
SUSE Linux Enterprise Desktop 12 GNOME 3.10.1 Kernel 3.12.39-47-default
up 5 days 14:26, 4 users, load average: 0.20, 0.20, 0.20
CPU AMD A4-5150M APU @ 3.3GHz | GPU Richland Radeon HD 8350G


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Roger Oberholtzer
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