How do you determine the amount of system memory?

[Dave Johnson]

Dave Johnson writes:
> The e820 info from the BIOS can help too (provided your BIOS is
> bug-free), get it from dmesg or /var/log/dmesg
>
> system 3
> --------
> 
> BIOS-provided physical RAM map:
>  BIOS-e820: 0000000000000000 - 000000000009fc00 (usable)
>  BIOS-e820: 000000000009fc00 - 00000000000a0000 (reserved)
>  BIOS-e820: 00000000000f0000 - 0000000000100000 (reserved)
>  BIOS-e820: 0000000000100000 - 000000007dee0000 (usable)
>  BIOS-e820: 000000007dee0000 - 000000007dee3000 (ACPI NVS)
>  BIOS-e820: 000000007dee3000 - 000000007def0000 (ACPI data)
>  BIOS-e820: 000000007def0000 - 000000007df00000 (reserved)
>  BIOS-e820: 00000000fec00000 - 0000000100000000 (reserved)
> 
> below 4GB PA is from 0000000000000000 - 0000000080000000 (2GB)
> above 4GB PA is no memory
> 
> This system has 2GB RAM all of which are from 0MB-2GB PA

one thing to watch out for is system 3 above has integrated graphics
where the bios has stolen 32MB (7e000000-80000000)

-- 
Dave