[mythtv] jerky/jittery video on fast box?

[John Joseph Roets]

Thank you.
The 32-bit mode really, really helped.  It is still a bit jittery upon
start of live tv, but when I pause for a second, and/or change channel,
it catches up, and seems to keep up for the most part.  I also noticed a
great deal of improvement in seeking/FF during playback.  It's really
fast now.
MTRR seemed to be already set:

$ cat /proc/mtrr
reg00: base=0x00000000 (   0MB), size= 256MB: write-back, count=1
reg01: base=0xf8000000 (3968MB), size=  32MB: write-combining, count=1
reg02: base=0xf4000000 (3904MB), size=  64MB: write-combining, count=1

I'm assuming from reading the docs at mplayer that this is fine...though
the docs were a bit vaguely written concerning that...
"It's right, shows my Matrox G400 with 16MB memory. I did this from
XFree 4.x.x , which sets up MTRR registers automatically.
If nothing worked, you have to do it manually."

Does this mean that if there is anything in /proc/mtrr that it's right?
I looked into my XFree logs, and found some of these addresses listed
under NVIDIA, but not all...?

(--) PCI:*(1:0:0) NVidia Vanta rev 21, Mem @ 0xf0000000/24,
0xf8000000/25
(--) PCI: (2:14:0) BrookTree unknown chipset (0x036e) rev 17, Mem @
0xfb000000/12

>From this...
http://translate.google.com/translate?hl=en&sl=es&u=http://webmaster.bankhacker.com/ayuda-linux/consulta/MTRR%2Ben%2BLinux/&prev=/search%3Fq%3Dlinux%2BMTRR%26hl%3Den%26lr%3D%26ie%3DUTF-8
I think that I'm OK...?

On Tue, 2003-01-21 at 15:20, Mark Musone wrote:
> Well..just fromlooking at your specs..i can suggest some things to make
> it faster..
> I don't think it'll make a huge difference, but it should make _some_
> difference:
> 
> 
> 1. Enable 32 bit mode:
> 
> 		hdparm -c1 /dev/hda
> 
> 2. Check your MTRR settings..i don't know the exact stuff about it,
> Or if it really makes a difference, but if you go to the mplayer web
> site, it gives info
> On how to set your MTRR values correctly.
> 
> 
> -Mark
> 
> 
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> 
-- 

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