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Intel Working On 5-Level Paging To Increase Linux Virtual/Physical Address Space

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  • Intel Working On 5-Level Paging To Increase Linux Virtual/Physical Address Space

    Phoronix: Intel Working On 5-Level Paging To Increase Linux Virtual/Physical Address Space

    Intel developers are working on "five level paging" to overcome the x86_64 limitation of 256 TiB of virtual address space and 64 TiB of physical address space. While you may not have that much memory in your desktop, that limitation is being hit but can be increased through 5-level paging...

    http://www.phoronix.com/scan.php?pag...5-Level-Paging

  • #2
    i heard somewhere that this increases complexity and reduces performance
    is it true?
    Last edited by davidbepo; 12-09-2016, 08:10 AM.

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    • #3
      I wonder why they can't just increase memory pages bitness of their CPUs. Known as 64bit, they only use/have 48 bits for pages.

      The AMD64 architecture defines a 64-bit virtual address format, of which the low-order 48 bits are used in current implementations.[1](p120) This allows up to 256 TB (248bytes) of virtual address space. The architecture definition allows this limit to be raised in future implementations to the full 64 bits,[1](p2)(p3)(p13)(p117)(p120) extending the virtual address space to 16 EB (264 bytes). This is compared to just 4 GB (232 bytes) for the x86.[15]

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      • #4
        Originally posted by davidbepo View Post
        i heard somewhere that this increases complexity and reduces performance
        is it true?
        Every level of indirection does that. By how much remains to be measured.

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        • #5
          So the Intel guys are just bored? WTF will need this within the next 5 years?

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          • #6
            Originally posted by cRaZy-bisCuiT View Post
            So the Intel guys are just bored? WTF will need this within the next 5 years?
            Well the UK government need something to host all that data they're now collecting on its citizens.

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            • #7
              Relevant XKCD strip:
              https://xkcd.com/619/

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              • #8
                Originally posted by cRaZy-bisCuiT View Post
                So the Intel guys are just bored? WTF will need this within the next 5 years?
                There are options using this much of RAM and actually being limited by this restriction, for instance (https://www.sgi.com/products/servers/uv/). Another possible use for these expanded limits is the introduction of technology like the 3D xpoint.

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                • #9
                  Originally posted by Azpegath View Post
                  Relevant XKCD strip:
                  https://xkcd.com/619/
                  for those that didn't know yet: Desktop isn't main linux target.

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                  • #10
                    Originally posted by starshipeleven View Post
                    for those that didn't know yet: Desktop isn't main linux target.
                    For those that didn't know yet: You're boring.

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