[mythtv-users] powernowd (et al) on SMP with Mythtv?
lists at wilsonet.com
Fri Feb 9 16:06:15 UTC 2007
Michael Thome wrote:
> I'm having trouble getting powernowd (and other cpu scalers) to react
> appropriately to Myth's cpu loading patterns with my dual-core machine -
> I suspect I need to play around with parameters some more, but I thought
> I'd see if anyone else is happy with their settings.
> The problem: watch live tv on a software-encoded tuner leads to high cpu
> utilization on one core (85-95%) but low on the other (10%). powernowd
> leaves the clock rate at lowest setting, resulting in jerky motion on
> playback. Similar situations can happing during DVD playing, HD
> playback, etc - one cpu is all out, the other is idle, average is around
> 50%. Percept is great if I turn off powernowd, but then I'm always
> running at high clockrate. Kernel-only on_demand seems to behave similarly.
> My system is an Athlon 64 X2 4200+ (65W), Ubuntu Edgy
What kernel? There have been a number of multi-core specific fixes to
the powernow-k8 code in recent kernels. The ondemand governor works
perfectly for me w/a 188.8.131.52-based kernel in a dual-core opteron system.
jarod at wilsonet.com
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