[haiku-bugs] Re: [Haiku] #5085: Poor vesa performance on NVidia Quadro FX770M
- From: "bonefish" <trac@xxxxxxxxxxxx>
- Date: Tue, 22 Dec 2009 13:17:29 -0000
#5085: Poor vesa performance on NVidia Quadro FX770M
---------------------------+------------------------------------------------
Reporter: PieterPanman | Owner: bonefish
Type: bug | Status: new
Priority: normal | Milestone: R1
Component: System/Kernel | Version: R1/Development
Keywords: | Blockedby:
Platform: All | Blocking:
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Comment(by bonefish):
Replying to [comment:6 PieterPanman]:
> Is there something I can hack in the kernel to get this to work for my
case specifically?
In src/system/kernel/arch/x86/arch_vm.cpp:arch_vm_init_post_modules() you
could comment out the loop calling add_memory_type_range() and add a
single call to add_memory_type_range() instead. I would first try the
following:
{{{
add_memory_type_range(-1, 0, 0xbe000000, B_MTR_WB);
}}}
If the holes in the RAM memory ranges are locations where device registers
are mapped, this could cause problems, though. Then I would try a smaller
range -- replace the 0xbe000000 e.g. by 0xbc000000 -- and also limit the
used RAM size to that amount (LIMIT_AVAILABLE_MEMORY in the
kernel_debug_config.h header).
Your frame buffer range will still be too complex to be fully covered, but
that should only concern the last 12 KB, i.e. only the last few rows.
--
Ticket URL: <http://dev.haiku-os.org/ticket/5085#comment:7>
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