linux-kernel - RE: 4GB Physical. Less than 3GB in Linux.

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Message-ID: <8E8F647D7835334B985D069AE964A4F7028FE6F2@ECQCMTLMAIL1.quebec.int.ec.gc.ca>
Date:	Mon, 16 Apr 2007 09:12:56 -0400
From:	"Fortier,Vincent [Montreal]" <Vincent.Fortier1@...GC.CA>
To:	"Jeff Chua" <jeff.chua.linux@...il.com>,
	"lkml" <linux-kernel@...r.kernel.org>
Subject: RE: 4GB Physical. Less than 3GB in Linux.

> 
> I've noticed that with 4GB physical ram, I'm only see 3098000 
> MB on the Dell 745, and 3107056MB on the IBM X60s.
> 
> I've tested with CONFIG_HIGHMEM4G=y, CONFIG_HIGHMEM64G=y, 
> CONFIG_X86_PAE=y, but nothing makes any difference.
> 
> Tested on Linux 2.6.20, Linux 2.6.21-rc7.

Got similar problem on a HP XW6200:
http://bugzilla.kernel.org/show_bug.cgi?id=7111

Tought I was the only one getting this!

> # dmesg
> copy_e820_map() start: 0000000000000000 size: 000000000009f000 end:
> 000000000009f000 type: 1
> copy_e820_map() type is E820_RAM
> copy_e820_map() start: 000000000009f000 size: 0000000000001000 end:
> 00000000000a0000 type: 2
> copy_e820_map() start: 00000000000dc000 size: 0000000000024000 end:
> 0000000000100000 type: 2
> copy_e820_map() start: 0000000000100000 size: 00000000bf5d0000 end:
> 00000000bf6d0000 type: 1
> copy_e820_map() type is E820_RAM
> copy_e820_map() start: 00000000bf6d0000 size: 000000000000f000 end:
> 00000000bf6df000 type: 3
> copy_e820_map() start: 00000000bf6df000 size: 0000000000021000 end:
> 00000000bf700000 type: 4
> copy_e820_map() start: 00000000bf700000 size: 0000000000900000 end:
> 00000000c0000000 type: 2
> copy_e820_map() start: 00000000f0000000 size: 0000000004000000 end:
> 00000000f4000000 type: 2
> copy_e820_map() start: 00000000fec00000 size: 0000000000010000 end:
> 00000000fec10000 type: 2
> copy_e820_map() start: 00000000fed00000 size: 0000000000000400 end:
> 00000000fed00400 type: 2
> copy_e820_map() start: 00000000fed14000 size: 0000000000006000 end:
> 00000000fed1a000 type: 2
> copy_e820_map() start: 00000000fed1c000 size: 0000000000074000 end:
> 00000000fed90000 type: 2
> copy_e820_map() start: 00000000fee00000 size: 0000000000001000 end:
> 00000000fee01000 type: 2
> copy_e820_map() start: 00000000ff800000 size: 0000000000800000 end:
> 0000000100000000 type: 2
>  BIOS-e820: 0000000000000000 - 000000000009f000 (usable)
>  BIOS-e820: 000000000009f000 - 00000000000a0000 (reserved)
>  BIOS-e820: 00000000000dc000 - 0000000000100000 (reserved)
>  BIOS-e820: 0000000000100000 - 00000000bf6d0000 (usable)
>  BIOS-e820: 00000000bf6d0000 - 00000000bf6df000 (ACPI data)
>  BIOS-e820: 00000000bf6df000 - 00000000bf700000 (ACPI NVS)
>  BIOS-e820: 00000000bf700000 - 00000000c0000000 (reserved)
>  BIOS-e820: 00000000f0000000 - 00000000f4000000 (reserved)
>  BIOS-e820: 00000000fec00000 - 00000000fec10000 (reserved)
>  BIOS-e820: 00000000fed00000 - 00000000fed00400 (reserved)
>  BIOS-e820: 00000000fed14000 - 00000000fed1a000 (reserved)
>  BIOS-e820: 00000000fed1c000 - 00000000fed90000 (reserved)
>  BIOS-e820: 00000000fee00000 - 00000000fee01000 (reserved)
>  BIOS-e820: 00000000ff800000 - 0000000100000000 (reserved) 
> 2166MB HIGHMEM available.
> 896MB LOWMEM available.
> 
> Memory: 3106140k/3136320k available (2225k kernel code, 
> 29072k reserved, 910k data, 196k init, 2218816k highmem) 
> virtual kernel memory layout:
>     fixmap  : 0xfff50000 - 0xfffff000   ( 700 kB)
>     pkmap   : 0xff800000 - 0xffc00000   (4096 kB)
>     vmalloc : 0xf8800000 - 0xff7fe000   ( 111 MB)
>     lowmem  : 0xc0000000 - 0xf8000000   ( 896 MB)
>       .init : 0xc0416000 - 0xc0447000   ( 196 kB)
>       .data : 0xc032c513 - 0xc040ff34   ( 910 kB)
>       .text : 0xc0100000 - 0xc032c513   (2225 kB)
> 
> 
> Thanks,
> Jeff.

- vin
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