On Sun, Apr 30, 2006 at 11:40:37AM +0200, Michel Dänzer wrote:
>On Sat, 2006-04-29 at 23:11 -0400, John Gruenenfelder wrote:
>> Package: xserver-xorg-video-savage
>> Version: 1:2.0.2.3-4
>> Severity: normal
>>
>> After upgrading to the new modular X packages, I find that my X setup
>> now uses an excessive amount of CPU time to play back video when using
>> the XVideo extension.
>>
>> The machine is my MythTV box. It is a small Shuttle box with builtin
>> "S3 Inc. VT8375 [ProSavage8 KM266/KL266]" video on the motherboard.
>> With the previous X packages video playback was excellent. The problem
>> appears to affect any program which makes use of the XVideo extension
>> (MythTV, mplayer, xine, etc.).
>
>This is most likely a duplicate of
>http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=362755 .
It does look very similar. The report mentions being able to temporarily fix
this by manually setting the MTRR.
If I could do this, I could test this and let you know for certain.
Unfortunately, the other bug report does not give any specifics for this.
Looking at the mtrr.txt file included with the kernel, I have tried a few
things. The current MTRRs are:
reg00: base=0x00000000 ( 0MB), size= 512MB: write-back, count=1
reg01: base=0x1e000000 ( 480MB), size= 32MB: uncachable, count=1
reg02: base=0xd8000000 (3456MB), size= 64MB: write-combining, count=1
reg05: base=0xd8000000 (3456MB), size= 64MB: write-combining, count=1
reg01 is the video framebuffer. Because this is a motherboard video chipset,
the video memory is taken from main memory. I am having trouble setting the
MTRR to what I believe it should be:
foxstar:~# echo "base=0x1e000000 size=0x2000000 type=write-combining" >|
/proc/mtrr
bash: echo: write error: Invalid argument
So I tried getting rid of the existing MTRR settings first:
foxstar:~# echo "disable=1" >| /proc/mtrr
foxstar:~# cat /proc/mtrr
reg00: base=0x00000000 ( 0MB), size= 512MB: write-back, count=1
reg02: base=0xd8000000 (3456MB), size= 64MB: write-combining, count=1
reg05: base=0xd8000000 (3456MB), size= 64MB: write-combining, count=1
foxstar:~# echo "base=0x1e000000 size=0x2000000 type=write-combining" >|
/proc/mtrr
bash: echo: write error: Invalid argument
Am I doing something wrong here? Or perhaps this must be done differently
when the video memory is under the same MTRR as the main system memory?
--
--John Gruenenfelder Research Assistant, UMass Amherst student
Systems Manager, MKS Imaging Technology, LLC.
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