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发表于 2012-2-27 20:05:43
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本帖最后由 cuda 于 2012-2-27 20:13 编辑
写得很清楚,受教了。
有个地方我想补充一下。如果没打开PAE, 32位Linux也只能认到3.25g左右的内存,开了之后就没限制了。
在没开PAE的情况下,不同机器能认到的内存数量和主板有关。最近关注的超微4路h8gqi主板的说明书里面正好有个介绍,转贴如下:- Note 2: Due to memory allocation to system devices, the amount of memory that remains available for operational use will be reduced when 4 GB of RAM is used. The reduction in memory availability is disproportional.
- 设备 占用 剩余
- Firmware Hub flash memory (System BIOS) 1 MB 3.99 GB
- Local APIC 4 KB 3.99 GB
- Area Reserved for the chipset 2 MB 3.99 GB
- I/O APIC (4 Kbytes) 4 KB 3.99 GB
- PCI Enumeration Area 1 256 MB 3.76 GB
- PCI Express (256 MB) 256 MB 3.51 GB
- PCI Enumeration Area 2
- (if needed) -Aligned on 256-M boundary- 512 MB 3.01 GB
- VGA Memory 16 MB 2.85 GB
- TSEG 1 MB 2.84 GB
- Memory available for the OS & other applications 2.84 GB
复制代码cym104 发表于 2012-2-27 16:26 |
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