How does UP board divide the memory?

yehnan
yehnan New Member Posts: 16 ✭
in UP Board Linux
After installing Ubilinux.

If I enter BIOS, I can see there are 4 GB memory.
If i type command df, there are total 3.3 GB memory.
$ free -h

total used free shared buffers cached
Mem: 3.3G 516M 2.8G 44M 21M 284M
-/+ buffers/cache: 209M 3.1G
Swap: 0B 0B 0B

Where are other memory? Be used by HD graphics processor?

And if the information is already provided by some document, please tell me where the doc is.

Thanks.
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Comments

  • DCleri
    DCleri Administrator, AAEON Posts: 1,213 admin
    Hi yehnan,

    by default 512MB are reserved to GPU, that is why you don't see it available.
    If you don't need that much memory on the GPU, you can enter the BIOS and change the amount of memory down.

    I will update this info in a page with other FAQ soon.

    Thanks!
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  • yehnan
    yehnan New Member Posts: 16 ✭
    In BIOS - Chipset - North Bridge - Total Memory,
    it's 4096 MB.

    $ free -h shows that there are total memory 3.3 GB.

    3.3 GB + 0.5 GB = 3.8 GB < 4 GB

    Where is the other 0.2 GB?

    Thanks for replying so fast.
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  • DCleri
    DCleri Administrator, AAEON Posts: 1,213 admin
    Hi yehnan,

    Some of the memory is reserved for other purposes by the BIOS, like, but not only, hardware DMA.
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