Re: measuring cpu frequency

From: Ivan Fernandez (ivan.fernandez_at_vanderbilt.edu)
Date: 05/01/04

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    On 2004-05-01, Micha Feigin <michf@post.tau.ac.il> wrote:
    > On Fri, Apr 30, 2004 at 04:48:24PM +0000, Ivan Fernandez wrote:
    >> OK, I've been trying to set up cpu frequency scaling in my Dell Inspiron
    >> 5150 (3.06GHz Mobile Pentium 4, debian testing and 2.6.5 kernel). I
    >> seem to have everything in place, cpu frequency scaling compiled into
    >> the kernel, together with performance and powersave governors, userspace
    >> governor as default, frequency tables helpers too, and the p4-clockmod
    >> module as driver. All the relevant files show up under
    >> /sys/devices/system/cpu/cpu0/cpufreq/ and the userspace daemon I use to
    >> switch frequencies (powernowd) loads and apparently changes frequencies
    >> alright.
    >>
    >> My problem is that I can notice no cooling at all, CPU temperature is
    >> around 70C most of the time, just as the same as before enabling the
    >> whole cpufreq thing. I don't know how to measure real frequency:
    >> the numbers that show on /proc/cpuinfo match with
    >> /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed, but x86info -mhz
    >> (which reads from /dev/cpu/0/cpuid, I believe, shows a different clock
    >> speed (higher, either around 1500 MHz or, most of the time, the full
    >> 3.06 GHz). Which one should I trust? Is there any other way to measure
    >> cpu speed accurately?
    >>
    >
    > I don't know how accurate it is but you could try bogomips. It doesn't
    > report cpu frequency but the bogomips value which is a measure of the
    > cpu speed (I don't know what the values are). It should let you know
    > the relative speed of the cpu.

    bogomips suggests that the right reading is the one on
    /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed, but I still don't
    notice any cooling. I cut it down even more with
    /proc/acpi/processor/CPU0/throttling (with both powersave cpufreq and
    acpi throttling at 62%, bogomips are at 180, as opposed to 2084 at full
    throttle and with the performance cpufreq governor). I have the
    impression that the fan fires up less frequently, but no hard data on
    this.

    Thanks anyway 

    -- 
Ivan Fernández
ivan.fernandez@vanderbilt.edu
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