On 7/11/07, Zan Lynx <[EMAIL PROTECTED]> wrote:
I bet that it is the MTRR setting.
Here is the MTRR from a system running an Nvidia card with the nv driver.
$ cat /proc/mtrr
reg00: base=0x00000000 ( 0MB), size=1024MB: write-back, count=1
reg01: base=0xf0000000 (3840MB), size= 64MB: write-combining, count=1
This is the line from the X log where it sets it up:
(==) NV(0): Write-combining range (0xf0000000,0x4000000)
Here's what I found deep in x.org:
#if defined(__ia64__) || defined(__arm__) || defined(__s390__)
#ifndef MAP_WRITECOMBINED
#define MAP_WRITECOMBINED 0x00010000
#endif
#ifndef MAP_NONCACHED
#define MAP_NONCACHED 0x00020000
#endif
if(flags & VIDMEM_FRAMEBUFFER)
mapflags |= MAP_WRITECOMBINED;
else
mapflags |= MAP_NONCACHED;
#endif
This is used on mmap. I'm going to try it.
--
Timothy Normand Miller
http://www.cse.ohio-state.edu/~millerti
Open Graphics Project
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