[FZH] 4GiB 内存只显示为 3950MiB

[Liang Suilong]

其实我也想知道，以前用2GB内存的时候有时也显示1.9GB。
On Apr 9, 2011 2:43 PM, "microcai" <microcai在fedoraproject.org> wrote:
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> BIOS-provided physical RAM map:
> BIOS-e820: 0000000000000000 - 000000000009fc00 (usable)
> BIOS-e820: 000000000009fc00 - 00000000000a0000 (reserved)
> BIOS-e820: 00000000000e0000 - 0000000000100000 (reserved)
> BIOS-e820: 0000000000100000 - 00000000bffd0000 (usable)
> BIOS-e820: 00000000bffd0000 - 00000000bffde000 (ACPI data)
> BIOS-e820: 00000000bffde000 - 00000000bffe0000 (ACPI NVS)
> BIOS-e820: 00000000bffe0000 - 00000000c0000000 (reserved)
> BIOS-e820: 00000000fec00000 - 00000000fec01000 (reserved)
> BIOS-e820: 00000000fee00000 - 00000000fef00000 (reserved)
> BIOS-e820: 00000000fff00000 - 0000000100000000 (reserved)
> BIOS-e820: 0000000100000000 - 0000000140000000 (usable)
>
> 这是 BIOS 报告的 RAM 布局。从 BIOS 的报告来看，RAM 分布到超过 5G 的地址
> 空间，所以MEM remmap 是已经在 BIOS 里正确开启了。 我将所有的 usable 内存
> 计算后发现，容量是 4095MB, 除去被 hardcode 的 BIOS ROM , 还有用来保存
> ACPI table 的内存, OS 确实可以使用 4095MB 的内存。
>
> 但是启动内核后，free 显示我的内存只有 3950 MB , 145MB 的内存消失了！
> why ?!
>
>
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