[mythtv-users] XP2100 outperforms my P4-3.2Ghz

[Brian Foddy]

On Wed, 18 Jan 2006, Marius Schrecker wrote:

>> On Wednesday 18 January 2006 17:25, mythtv-users-request at mythtv.org wrote:
>>> I had myth setup on a XP2100 processor system and everything worked
>>> quite
>>> well.  Now that I have upgraded to a new computer with a P4
>>> 3.2Ghzprocessor, during live TV, mythfrontend actually uses more of my
>>> CPU.
>>> Sometimes up to 99%.  When this happens I get a prebuffering pause and
>>> the
>>> video kind of glitches.  Anybody ever experience something like this?  I
>>> have tried changing most of the settings in the setup and didn't see any
>>> improvement.  I was thinking about trying another kernel or video card,
>>> but
>>> the video card doesn't seem to be the problem.
>>> Notable differences in systems:
>>>
>>> AMD XP2100 proc
>>> Nvidia FX5200
>>> Fedora Core 3
>>> 2.6.10 kernel
>>> Hauppauge PVR250
>>>
>>> P4 3.2Ghz proc
>>> ATI X300
>>> Fedora Core 4
>>> 2.6.14-SMP kernel
>>> Hauppauge PVR250
>>>
>>> Thanks for any help you can offer!
>>> A
>> If your Nvidia had Nvidia's drivers it would have had hard-decode support,
>> if
>> your ATI card uses the xorg drivers it doesn't have that. I can run
>> 800x600
>> on a 300MHz machine with the right Nvidia drivers, it fails to play
>> 480x480
>> with the xorg drivers.
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>>
> Why are you using a SMP kernel? I've never used a Dual Core processor, but
> I'm guessing that even then you'd probably be better off with a standard
> (optimized) kernel.

I disagree.  Its hard for me to imagine any realworld situation
where a smp kernel on a hyperthreaded cpu would not perform at least
as well as a non-smp kernel.  And if you have a true dual core cpu,
definately use it.  HT may only be a very modest improvement, but
I have 2 machines with 2 Xeon HT cpus, and I set them both up for 4
cpu smp support.


Brian