linux-kernel - Re: 15995MB available under Linux but 16329MB available under Win 7

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Date:	Sat, 22 Mar 2014 00:03:47 -0600
From:	Robert Hancock <hancockrwd@...il.com>
To:	Branimir Maksimovic <branimir.maksimovic@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: 15995MB available under Linux but 16329MB available under Win
 7

On 21/03/14 10:35 PM, Branimir Maksimovic wrote:
> This really puzzles me.
>
> bmaxa@...a:~$ lspci -v -s 01:00.0
> 01:00.0 VGA compatible controller: NVIDIA Corporation GF114 [GeForce GTX
> 560 Ti] (rev a1) (prog-if 00 [VGA controller])
>      Subsystem: CardExpert Technology Device 0801
>      Flags: bus master, fast devsel, latency 0, IRQ 52
>      Memory at f4000000 (32-bit, non-prefetchable) [size=32M]
>      Memory at e8000000 (64-bit, prefetchable) [size=128M]
>      Memory at f0000000 (64-bit, prefetchable) [size=64M]
>      I/O ports at e000 [size=128]
>      [virtual] Expansion ROM at f6000000 [disabled] [size=512K]
>      Capabilities: <access denied>
>      Kernel driver in use: nvidia
>
> bmaxa@...a:~$ dmesg | grep Mem
> [    0.000000] Memory: 16358808K/16721316K available (7232K kernel code,
> 1106K rwdata, 3456K rodata, 1324K init, 1432K bss, 362508K reserved)

Can you post your full dmesg output?

>
> Everything is clear most of reserved RAM goes to VGA mapping?
>
> But, Windows resource monitor and task manager says just around 50MB
> hardware reserved?
>
> So I have tried different kernel boot parameters to no avail.
> So question is: Does Windows magically maps VGA to upper addresses
> (beyond 16GB)
> or simply Windows does not reports all reserved RAM?
>
> When I disable memory remap in BIOS Windows reports 500MB more reserved,
> but Linux adds this 500MB to 300MB reserved giving around 800MB.
>
> CPU is i5 3570k, motherboard z77, 16GB of DD3 RAM, AMI BIOS.
>
> Branimir.
>

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