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>>The Official ASUS P8P67/P8Z68 & P8Z68/GEN3 Series Owners Club>> - Page 732

post #7311 of 9343
Quote:
Originally Posted by Rubers View Post

Then with it enabled the board is reserving 100mb for the iGPU, whereas without it's using much more. Memory remapping is 100% the onboard GPU.

So how does it really work? When it is enabled, where does it get the difference of 800MB (7.90GB - 7.10GB)?
post #7312 of 9343
Quote:
Originally Posted by kevindd992002 View Post

I'm 100% sure it was not an option for the initial BIOS version (0301), I have screenshots to prove it if you like smile.gif That goes for the initial BIOS version of the P8Z68-V non-gen3 boards as well (I had this mobo before).
This is what I noticed, with that option enabled I get "8.00GB (7.90 usable)" under Windows. With it disabled, I get "8.00GB (7.1 usable)". So I'm not sure why you said that with it disabled I will only see 4GB in my OS?

I know it has been there since 0402 - that is the BIOS I had when I got my board.

Well, it depends on the chipset and the maximum amount of memory it can support. The device drivers expect to be mapped to the upper 4GB of virtual address space and that address space is therefor unavailable to Windows. Remapping maps the physical memory it would have mapped to that virtual address range to virtual addresses at the top of the address space the chipset supports so you can then access all of your physical memory.
post #7313 of 9343
Here is a diagram I once made on how I believe it works. Without the remapping the physical to virtual mapping is one to one contiguous so you loos that space.

An I could be wrong about the introduction of the remapping option in the BIOS. It seems like it was always there but I could be mistaken. When it wasn't I would have expected it would have been enabled by default.

BIOS Remapping.pdf 94k .pdf file
Edited by GeneO - 7/8/12 at 3:55pm
post #7314 of 9343
Quote:
Originally Posted by GeneO View Post

Here is a diagram I once made on how I believe it works. Without the remapping the physical to virtual mapping is one to one contiguous so you loos that space.
An I could be wrong about the introduction of the remapping option in the BIOS. It seems like it was always there but I could be mistaken. When it wasn't I would have expected it would have been enabled by default.
BIOS Remapping.pdf 94k .pdf file

Thanks. Maybe because you ahve the PRO version of my board which is why you had that feature even with the initial BIOS revision for your board? I don't know but I'm 100% sure that initially my board's BIOS didn't have that but then again I'm also not sure if it was enabled y default.

So in general, it is recommended to keep that enabled, right?
post #7315 of 9343
Yes, correct.
post #7316 of 9343
Quote:
Originally Posted by GeneO View Post

Yes, correct.

Can you explain, in detail, the drawing that you've uploaded? What is virtual address space?
post #7317 of 9343
Quote:
On a 32-bit Microsoft Windows installation, by default, only 2 GB are made available to processes for their own use. The other 2GB are used by the operating system. On later 32-bit editions of Microsoft Windows it is possible to extend the user-mode virtual address space to 3 GB while only 1 GB is left for kernel-mode virtual address space by marking the programs as IMAGE_FILE_LARGE_ADDRESS_AWARE and enabling the /3GB switch in the boot.ini file.

On 64-bit Microsoft Windows, processes running 32-bit executables that were linked with the /LARGEADDRESSAWARE:YES option have access to 4 GB of virtual address space; without that option they are limited to 2GB. By default, 64-bit processes have 8TB of user-mode virtual address space; Linking with /LARGEADDRESSAWARE:NO artificially limits the user-mode virtual address space to 2 GB.

Allocating memory via system calls such as C's malloc implicitly maps bytes of the page file into the VAS. However, a process can also explicitly map file bytes.

http://en.wikipedia.org/wiki/Virtual_address_space

Note that this can include Pagefile......
Edited by alancsalt - 7/9/12 at 9:22am
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post #7318 of 9343
Quote:
Originally Posted by kevindd992002 View Post

Can you explain, in detail, the drawing that you've uploaded? What is virtual address space?

The operating system deals with virtual addresses. These are translated to physical addresses by the hardware (physical RAM, etc). You have the appearance of a contiguous address space that may be mapped non-contiguously to hardware addresses. The wikipedia reference is a good one.
Edited by GeneO - 7/9/12 at 9:54am
post #7319 of 9343
Quote:
Originally Posted by alancsalt View Post

Quote:
On a 32-bit Microsoft Windows installation, by default, only 2 GB are made available to processes for their own use. The other 2GB are used by the operating system. On later 32-bit editions of Microsoft Windows it is possible to extend the user-mode virtual address space to 3 GB while only 1 GB is left for kernel-mode virtual address space by marking the programs as IMAGE_FILE_LARGE_ADDRESS_AWARE and enabling the /3GB switch in the boot.ini file.
On 64-bit Microsoft Windows, processes running 32-bit executables that were linked with the /LARGEADDRESSAWARE:YES option have access to 4 GB of virtual address space; without that option they are limited to 2GB. By default, 64-bit processes have 8TB of user-mode virtual address space; Linking with /LARGEADDRESSAWARE:NO artificially limits the user-mode virtual address space to 2 GB.
Allocating memory via system calls such as C's malloc implicitly maps bytes of the page file into the VAS. However, a process can also explicitly map file bytes.
http://en.wikipedia.org/wiki/Virtual_address_space
Note that this can include Pagefile......

Quote:
Originally Posted by GeneO View Post

The operating system deals with virtual addresses. These are translated to physical addresses by the hardware (physical RAM, etc). You have the appearance of a contiguous address space that may be mapped non-contiguously to hardware addresses. The wikipedia reference is a good one.

Thanks! So basically what situation would make it necessary to disable that memory remap feature of the BIOS?
post #7320 of 9343
That I don't know. Can't think of a situation, but the fact the option exists would seem to indicate it's possible.
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