[mythtv-users] powernowd (et al) on SMP with Mythtv?
mthome at bbn.com
Fri Feb 23 14:39:03 UTC 2007
Whups - missed your reply... I'm running 2.6.17 (ubuntu build)... I'm
holding off on later kernels because of the mess that is ivtv/dvb/v4l
being in transition - had a *terrible* time finding a kernel+drivers
combination where both pvr-150 and hd5500 would work at the same time.
Jarod Wilson wrote:
> 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 18.104.22.168-based kernel in a dual-core opteron system.
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