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EXT4 In Linux 4.10 Gains DAX iomap, Encryption Improvements

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  • EXT4 In Linux 4.10 Gains DAX iomap, Encryption Improvements

    Phoronix: EXT4 In Linux 4.10 Gains DAX iomap, Encryption Improvements

    The EXT4 file-system is seeing some new feature work with the in-development Linux 4.10 merge window...

    http://www.phoronix.com/scan.php?pag...For-Linux-4.10

  • #2
    persistent memory storage devices
    Could someone translate this and the rest of the untranslated news? Please....

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    • #3
      Originally posted by timofonic View Post

      Could someone translate this and the rest of the untranslated news? Please....
      This is what come in my mind, but might going too far:

      http://www.anandtech.com/show/9470/i...ance-than-nand
      http://www.anandtech.com/show/9314/n...ited-endurance
      http://www.anandtech.com/show/10562/...alpurpose-ssds

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      • #4
        does DAX (theoreticaly) improve performance?

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        • #5
          Originally posted by timofonic View Post
          Could someone translate this and the rest of the untranslated news? Please....
          Storage devices fast as RAM (more or less) but that don't lose their content when powered down (while RAM is erased if shut down). That have decent capacities too, of course.

          Since they are basically fast as RAM, there is no need to use page cache and other caching tricks that are used to speed up disk access, worse, these things duplicate or triplicate the reads or writes, halving the performance.

          DAX is a feature that allows you to bypass these caches, which is useful for these kinds of ridiculously fast storage devices.

          Plus a bunch of other things like different error handling and whatever.

          see here (kernel docs) for more details

          http://lxr.free-electrons.com/source...ystems/dax.txt

          does DAX (theoreticaly) improve performance?
          Not on traditional storage systems, that are far slower than RAM.
          It bypasses RAM caches, so they tank hard.

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          • #6
            thanks for the explanation starshipeleven

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            • #7
              Originally posted by davidbepo View Post
              does DAX (theoreticaly) improve performance?
              it reduces memory usage for page cache. which can improve performance if for example your database has it own cache anyway

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