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Full DynTicks Proposed For Linux Kernel Integration

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  • Full DynTicks Proposed For Linux Kernel Integration

    Phoronix: Full DynTicks Proposed For Linux Kernel Integration

    Aside from the KVM pull request, another interesting proposed change for the Linux 3.10 kernel is the "full dynticks" support, also known as CONFIG_NO_HZ_FULL. Ingo Molnar is trying to get this brand new feature into the next Linux kernel release...

    Phoronix, Linux Hardware Reviews, Linux hardware benchmarks, Linux server benchmarks, Linux benchmarking, Desktop Linux, Linux performance, Open Source graphics, Linux How To, Ubuntu benchmarks, Ubuntu hardware, Phoronix Test Suite

  • #2
    Doesn't a tickless kernel also reduce power consumption because a tick kernel continually wakes up the CPU? (I could be totally wrong on this, hence the question mark)
    All opinions are my own not those of my employer if you know who they are.

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    • #3
      Asynchronous CPU?

      Could this be useful on a asynchronous CPU?

      I wish there were more asynchronous CPUs on the market...

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      • #4
        Originally posted by Ericg View Post
        Doesn't a tickless kernel also reduce power consumption because a tick kernel continually wakes up the CPU? (I could be totally wrong on this, hence the question mark)

        Basically yes.

        But in this particular case no. Because the dynticks feature already took care of disabling ticks when idling.

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        • #5
          Originally posted by Ragas View Post
          Basically yes.

          But in this particular case no. Because the dynticks feature already took care of disabling ticks when idling.
          Thanks Ragas, so no lowered power consumption really, but slightly better performance under some workloads. Still overall a net gain since we're moving away from ticked kernels as a design anyway, this is just extending it
          All opinions are my own not those of my employer if you know who they are.

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          • #7
            Originally posted by Ericg View Post
            Thanks Ragas, so no lowered power consumption really, but slightly better performance under some workloads. Still overall a net gain since we're moving away from ticked kernels as a design anyway, this is just extending it
            Better performance means lower power, because the cpu can sit idling in a lower C state longer, since it has finished processing earlier.

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