Messages in this thread | | | Subject | Re: MTRR problem in 2.4.7+ on Athlon+VIA? XFree86 can't write-combine | Date | Sun, 19 May 2002 17:04:15 +0100 (BST) | From | Alan Cox <> |
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> (WW) NV(0): Failed to set up write-combining range (0xd4000000,0x800000) > to XFree86.0.log. XFree86 works, but things like MPEG playback seem a > bit slow.
Thats more likely because the Nv driver doesn't support Xv or Xvmc extensions, which most other drivers have and give you nice accelerated overlay/colourspace/scaling for video playback.
> I assume this is because cat /proc/mtrr looks like this before X starts: > > reg00: base=0x00000000 ( 0MB), size= 128MB: write-back, count=1 > reg01: base=0xd0000000 (3328MB), size= 128MB: uncachable, count=1 > > From reading the mtrr doco I gather that because 0xd0000000 + 128mb is > already set up as an uncachable range, "nv" can't set up 0xd4000000 + > 8mb as write-combining.
You can tweak the ranges yourself, deleting the uncachable one and putting it back as two ranges
> I've searched all through the 2.4.7-10 source code and can't see > anything that I'm using that explicitly asks for MTRR_TYPE_UNCACHABLE, > so I'm a bit perplexed. I've had a good look around the web and
The BIOS sets them up for you
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