On Wed, Dec 21, 2011 at 3:22 AM, Paul Sijben <p...@sijben.net> wrote:
> Update: the 3400 runs at 2.7Ghz. Do not know why /proc/cpuinfo reports it
> as 800MHz.
>

Not sure about the ATI card, I use a NVIDIA,

As for /proc/cpuinfo,

It will read the speed the CPU is currently running at, not the max
speed.  AMD chips are actually pretty good about scaling, so when idle
they tend to slow down to reduce heat and save power.  For example, I
have a Athlon 64 X2 6000+ (3.0 Ghz, dual core) in my main freevo box,
but it is reading 1 Ghz for cpu speed right now.

With cpufreq-set, you can adjust the cpu speed at will.  For example,
I run Hulu Desktop with Freevo (using a fxd command file).  Since Hulu
seems to take a lot of processing power and sometimes the cpu doesn't
scale up fast enough, I now start hulu with this script:


cpufreq-set -c 0 -f 3.0GHz
cpufreq-set -c 1 -f 3.0GHz
/usr/bin/huludesktop
cpufreq-set -c 0 -f 1.0GHz
cpufreq-set -c 1 -f 1.0GHz


Basically, the first two commands set my cpu frequency for each core
to their max (3.0 Ghz), then I run hulu.  When it exits, I set the
frequency back to the minimum 1 Ghz and let the standard governor take
over.

Try

cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor

to see what your current governor is, or

cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors

to see the available ones.

I use userspace, which then lets me use powernowd (you have to install
it separately).  It seems to be decent.

Anyway, you might try setting the governor to performance or just
setting the cpufreq to maximum before trying a video and see if that
helps your tearing problem.  You probably want the cpu to idle lower
when not in use, but it might at least give you an idea if your issue
is your cpu not running at full speed.

Preston

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