[mythtv-users] Quick opinions

[Steven Adeff]

On Wed, Jun 3, 2009 at 11:35 AM, Alan Marchiori<alan at alanmarian.com> wrote:
>>> Update....  a very interesting result.  I looked at /proc/cpuinfo and
>>> it reported my CPU as 1GHz (should be 2.6GHz).  I did some searching
>>> around and installed the cpufrequtils ubuntu package.  cpufreq-info
>>> also reported 1GHz even while playing the h264 file.  I played around
>>> with the different governors and only performance put the reported cpu
>>> freq up to 2.6GHz.
>>>
>>> Bottom line is with the CPU at 2.6GHz the clip played fine with
>>> perfect audio sync and 35%-40% cpu load.
>>>
>>> I have a mostly stock mythubuntu 9.04 system.  Not sure why default it
>>> clocks the CPU so low.?
>>
>> Because if you're not using it, it's fine to be slow as it uses less energy
>> and generates less heat (and thus less fan noise).
>>
>> VDPAU has caused a funny and new issue:  You need bus and memory bandwidth,
>> but not cpu power.  The governors do not have any way to detect this, so
>> they simply see "5% cpu? No need to clock up!".
>>
>
> It seems cpu freq selection should be done by myth (or the video
> player)?  Any good solutions other than manually setting the cpu freq
> (what I'm doing now)?  I still want it to clock down to 1G when idle
> but actually go up when needed.  Maybe tied to the screen saver (or
> dpms)?  When the screen blanks the cpu clocks down, if the screen is
> on it clocks up.  How do I hook a little bash script into these system
> events?

find where your system has the
Documentation/cpu-freq/governors.txt

file and read it, it explains the up/down_threshold parameters


-- 
Steve
http://www.mythtv.org/wiki/index.php/User:Steveadeff
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