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Fresh Linux 4.16 Kernel Benchmarks With KPTI & Retpolines

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  • Faalagorn
    replied
    Originally posted by Royi View Post
    nuetzel , Since I didn't understand what you meant (I'm new to the Linux world).
    Could you explain it again?

    Thank You.
    Take a look here: https://wiki.archlinux.org/index.php/Kernel_parameters

    Leave a comment:


  • nuetzel
    replied
    Originally posted by Royi View Post
    nuetzel , Since I didn't understand what you meant (I'm new to the Linux world).
    Could you explain it again?

    Thank You.
    Start with reading Michel's latest review:
    An Early Look At The Linux 4.16 Kernel Performance With AMD EPYC
    https://www.phoronix.com/scan.php?pa...416-epyc&num=1

    Leave a comment:


  • Royi
    replied
    nuetzel , Since I didn't understand what you meant (I'm new to the Linux world).
    Could you explain it again?

    Thank You.

    Leave a comment:


  • nuetzel
    replied
    Originally posted by Royi View Post
    Do you mean compiling it by myself?
    You _can_ do that, but... - NO, not needed.

    You 'only' have to append the above _kernel boot_ parameter (grep for 'grub' boot parameter for example or your distro's boot loader), to disable the mitigation.

    Can't I just manually install versions prior to the fix?
    This is possible, too. - But why would you lose all other new kernel stuff (see above)?

    Leave a comment:


  • Royi
    replied
    Do you mean compiling it by myself?
    Can't I just manually install versions prior to the fix?

    Leave a comment:


  • nuetzel
    replied
    Ah, sorry.
    For latest 4.15.x and above (backported, too) you should append

    nopti, nospectre_v2 --- nospectre_v1 (isn't ready, documented, yet - but you can try it)

    Linux kernel source tree <Documentation/admin-guide/kernel-parameters.txt>

    New firmware should be NO problem.

    Leave a comment:


  • Royi
    replied
    I'm new to the Linux Eco System.
    What I mean is on Linux Mint 18.3 when the "Anti Spctre & Meltdown" updates were out the system asked to update 2 things:
    1. Linux Kernel.
    2. Linux Firmware.

    What I ask is how can I roll it back to the latest Kernel + Firmware before those performance killer updates?

    Thank You.

    Leave a comment:


  • nuetzel
    replied
    For Nehalem (Lynnfield, Xeon versions) new firmware is currently only 'planned'.
    Last edited by nuetzel; 03-08-2018, 03:56 AM. Reason: typo

    Leave a comment:


  • Royi
    replied
    Is it only Kernel or Kernel + Firmware?
    For instance, if I have Linux Mint and I want to get back to the state before any "Mitigation" applied.
    What should I do?

    Leave a comment:


  • nuetzel
    replied
    'The Linux kernel build time fortunately was not impacted on this high-end Intel Xeon Scalable server.'

    _My_ real kernel compiles (amd-staging-drm-next) went down from ~7:30 min to 8:30 min ;-(
    running 4.15-rc amd-staging-drm-next (without any mitigation) before
    now 4.16.0-rc1 amd-staging-drm-next (all mitigation)
    on X3470, 4C/8T, 2,93 GHz, 24 GB Nehalem (sadly without PCID)

    Leave a comment:

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