[mythtv-users] Video studder XvMC w/OSD

[Roger Heflin]

Krzysztof Adamski wrote:
> On Wed, 2008-02-04 at 19:22 -0500, Roger Heflin wrote:
>> Mitch Gore wrote:
>>>> Yes, i also have the fade turned off.  With OSD Fade checked the stutter
>>>> is so bad its unwatchable.  It would be nice to get ride of it completely.
>>>> It really ruins the "experience" when you are watching/showing off Myth and
>>>> it skips a commercial and everyone is like wow thats cool.  Then it stutters
>>>> and looks like piece of junk.
>>>>
>>>> Mitchell
>>>>
>>> After some more investigation I noticed that the BOIS is reconizing the CPU
>>> as P4 3.0 ghz but its clock speed is set to 2Ghz.
>>>
>>> here is some output:
>>> [myth at mythfe ~]$ cat /proc/cpuinfo
>>> processor       : 0
>>> vendor_id       : GenuineIntel
>>> cpu family      : 15
>>> model           : 4
>>> model name      : Intel(R) Pentium(R) 4 CPU 3.00GHz
>>> stepping        : 1
>>> cpu MHz         : 1995.506
>>> cache size      : 1024 KB
>>> physical id     : 0
>>> siblings        : 2
>>> core id         : 0
>>> cpu cores       : 1
>>> fdiv_bug        : no
>>> hlt_bug         : no
>>> f00f_bug        : no
>>> coma_bug        : no
>>> fpu             : yes
>>> fpu_exception   : yes
>>> cpuid level     : 5
>>> wp              : yes
>>> flags           : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov
>>> pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe constant_tsc pebs
>>> bts sync_rdtsc pni monitor ds_cpl cid xtpr
>>> bogomips        : 4008.12
>>> clflush size    : 64
>>>
>>> processor       : 1
>>> vendor_id       : GenuineIntel
>>> cpu family      : 15
>>> model           : 4
>>> model name      : Intel(R) Pentium(R) 4 CPU 3.00GHz
>>> stepping        : 1
>>> cpu MHz         : 1995.506
>>> cache size      : 1024 KB
>>> physical id     : 0
>>> siblings        : 2
>>> core id         : 0
>>> cpu cores       : 1
>>> fdiv_bug        : no
>>> hlt_bug         : no
>>> f00f_bug        : no
>>> coma_bug        : no
>>> fpu             : yes
>>> fpu_exception   : yes
>>> cpuid level     : 5
>>> wp              : yes
>>> flags           : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov
>>> pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe constant_tsc pebs
>>> bts sync_rdtsc pni monitor ds_cpl cid xtpr
>>> bogomips        : 3974.91
>>> clflush size    : 64
>>>
>>>
>>> Maybe i need to update my BIOS.  Or is there some other thing i can change?
>>> I looked through BIOS settings but didnt see anything of intrest.
>>>
>>> Mitchell
>> Updating the bios may be required.
>>
>> I have seen motherboards that (for an unknown reason) detect the wrong cpu speed.
>>
>> You can try doing a "load failsafe", save and reboot and see what it does, and 
>> also a "load optimal" and save and reboot and check it, and also your bios may 
>> allow you to set a clock multiplier, if so you can calculate what the multiplier 
>> should be for 3.0 Ghz compared to what it currently is for 2.0Ghz, and set it to 
>> that.
> 
> This has nothing to do with the BIOS, it is the powersaving system that
> lowers the CPU clock. Look for cpufreq daemon.
> 
> K

If it were, cpufreq would be speeding things up, and that is a fairly old cpu, 
and it pre-dates Intel putting speedstep on their desktop cpus, they only did 
that very recently, and that cpu is not even a 64-bit capable cpu.

And note that all of the p4 cpus that have speedstep have 2048mb of cache, he 
has only 1024mb, so and all with speedstep also have 64 bit, and cpuinfo shows 
that the processor is not capable of 64bit.

                                   Roger