[mythtv-users] CPU performance governor vs disabling AMD Cool n Quiet

[Jarod Wilson]

On Sat, Oct 23, 2010 at 7:01 PM, Brian Wood <beww at beww.org> wrote:
> On Saturday, October 23, 2010 04:56:01 pm Jarod Wilson wrote:
>> On Sat, Oct 23, 2010 at 5:44 PM, Jean-Yves Avenard <jyavenard at gmail.com> wrote:
>> > On 24 October 2010 08:44, Jean-Yves Avenard <jyavenard at gmail.com> wrote:
>> >> When AMD Coon n'Quiet is enabled, the default governor set the bus
>> >> speed too low to properly feed the nvidia card for VDPAU usage. As
>> >> such, VDPAU is unusable. Set the minimum frequency to be around
>> >> 1.8GHz.
>> >
>> > Forgot to add that it wouldn't be any different with a GT220
>>
>> Interestingly enough though, my main frontend box is an athon 64 x2
>> (~2.7GHz, iirc) with a GT220. It runs with the ondemand cpufreq
>> governor enabled, with both cores pretty much always throttled back to
>> 1GHz, and it never has a single issue with vdpau playback...
>
> Do you think that mobo chipsets might make a difference here, as well as CPU clock speed?

Not sure. Was mostly just providing a data point w/o really thinking
about it. The chipset is an AMD 880G though, iirc.

> Also, there are some VDPAU-capable video cards for a standard PCI interface, would these have a similar problem,
> recognizing of course the that the PCI bus is slower to start with than PCIExpress? Would tweaking PCI latency be able to
> minimize this?

Beats me. Like I said, it Just Works(tm) here, so I've never given it
much thought. :)


-- 
Jarod Wilson
jarod at wilsonet.com