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Thread: File-Systems Appear To Slowdown On Linux 3.13 Kernel

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  1. #1
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    Default File-Systems Appear To Slowdown On Linux 3.13 Kernel

    Phoronix: File-Systems Appear To Slowdown On Linux 3.13 Kernel

    Our initial file-system testing of EXT4, XFS, Btrfs, and F2FS from the Linux 3.13 kernel appear to reveal that the performance overall is slower than when using the Linux 3.12 kernel on the same software/hardware configuration.

    http://www.phoronix.com/vr.php?view=19449

  2. #2
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    Quote Originally Posted by phoronix View Post
    Phoronix: File-Systems Appear To Slowdown On Linux 3.13 Kernel

    Our initial file-system testing of EXT4, XFS, Btrfs, and F2FS from the Linux 3.13 kernel appear to reveal that the performance overall is slower than when using the Linux 3.12 kernel on the same software/hardware configuration.

    http://www.phoronix.com/vr.php?view=19449
    You did not mention we are in the middle of a big change in the block layer:
    http://phoronix.com/forums/showthrea...ue-Block-Layer

  3. #3
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    Default 13.3 has been verified for Ubuntu LTS 14.04 ... so this will get some quick attention

    That being said, those are some pretty harsh regressions for any kernel status.

    Would be very interesting to see how spinning storage does.

    As the most simple inquiry ... can you see how many cores are being utilized for IO? As alluded to by Marco, there's changes afoot to spread IO across cores. Perhaps that's where the train's leaving the tracks?

    BTRFS was supposed to have a big jump in performance so what we might be seeing is a roughly equal performance hit, with BTRFS performance increases masking some of the IO performance decreases.

  4. #4
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    Quote Originally Posted by dmytty View Post
    That being said, those are some pretty harsh regressions for any kernel status.

    Would be very interesting to see how spinning storage does.

    As the most simple inquiry ... can you see how many cores are being utilized for IO? As alluded to by Marco, there's changes afoot to spread IO across cores. Perhaps that's where the train's leaving the tracks?

    BTRFS was supposed to have a big jump in performance so what we might be seeing is a roughly equal performance hit, with BTRFS performance increases masking some of the IO performance decreases.
    in my pretty basic testing i didn't have anywhere near the same performance deficit on hard-disk compared to ssd. that said my hard-disk based machine is only core2duo.

    his tests show way better performance than i was getting, although it does seem my performance has gone up a bit with rc2 compared to rc1.

  5. #5
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    interactivity is way better on 3.13, so i hope they won't fix this.(chrome start time from cold reduced by a forth )

  6. #6
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    I think that getting better interactive responsiveness is an acceptable trade-off for doing worse in synthetic benchmarks.

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