Messages in this thread | | | From | Andreas Hartmann <> | Subject | Re: missing 700 MB of RAM | Date | Mon, 22 Nov 2010 22:58:44 +0100 |
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Jiri Slaby wrote: > On 11/21/2010 08:02 PM, Andreas Hartmann wrote: >> I've got 8 GB RAM installed, but linux reports 7,3 GB. Where is the >> missing RAM (700 MB)? > ... >> The motherboard is a GA-MA78GM-S2H (64bit, AMD) with a on board Radeon >> HD 3200 VGA card. The card uses 256 MB of RAM - so 444 MB of RAM are >> missing. Where are they gone? > > Hi, ask your BIOS: > >> BIOS-provided physical RAM map: >> BIOS-e820: 0000000000000000 - 000000000009f800 (usable) >> BIOS-e820: 000000000009f800 - 00000000000a0000 (reserved) >> BIOS-e820: 00000000000f0000 - 0000000000100000 (reserved) >> BIOS-e820: 0000000000100000 - 00000000afde0000 (usable) >> BIOS-e820: 00000000afde0000 - 00000000afde3000 (ACPI NVS) >> BIOS-e820: 00000000afde3000 - 00000000afdf0000 (ACPI data) >> BIOS-e820: 00000000afdf0000 - 00000000afe00000 (reserved) >> BIOS-e820: 00000000e0000000 - 00000000f0000000 (reserved) >> BIOS-e820: 00000000fec00000 - 0000000100000000 (reserved) >> BIOS-e820: 0000000100000000 - 0000000230000000 (usable) > > It reports 7677M of usable mem. Or maybe your loader is cheating on you? > I doubt so...
Ok. That's right. Anyway, I'm wondering about the difference to free:
total used free shared buffers cached Mem: 7706580 5271096 2435484 0 79232 3049120
which is 7526M. This means, there are missing 151M of usable RAM?!
I would have expected, that free reprots the same amount as the kernel reports to be usable.
On the other hand, I would have expected, that the amount, reported by free + gfx-memory should nearly be 8 GB. Here it is: 7782. Thus there are missing 410 MB between the installed hardware and free + gfx-memory.
Does anybody kown, where to find them?
Removing the difference between free and physical ram map (410 - 151), ~259 MB are remaing. This is nearly the amount for the gfx-card, which has already been removed. Could it be, that the gfx-memory is reserved twice - once by the bios and another time by the kernel?!
Kind regards, Andreas
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