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Meltdown and Specter patch performance hit tested on Optane and VROC.

Discussion in 'SSD and HDD storage' started by nosirrahx, Jun 14, 2018.

  1. nosirrahx

    nosirrahx Member Guru

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    The Meltdown and Specter patches were rumored to hit Optane pretty hard and since I am using a 905P in my new workstation as an OS/app drive I decided to do some testing. I tested 4 way VROC 0 as well. The top pic has the OS set to 1709 (with no updates) with the last BIOS I could find before the microcode updates started being mentioned in the notes. The bottom pic has the OS set to 1803 + kb4284835 + kb4100347 and the current BIOS for this board. In both pics the 905P is on the left and the 4 way VROC 0 900P is on the right.

    [​IMG]

    [​IMG]
     
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  2. Fox2232

    Fox2232 Ancient Guru

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    That's painful to watch.
     
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  3. RealNC

    RealNC Ancient Guru

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    Can you test with everything fully updated, but with the mitigations disabled? You can use the InSpectre tool to easily disable and re-enable Meltdown and Spectre mitigations:

    https://www.grc.com/inspectre.htm

    It would be interesting to see if just disabling the mitigations on a fully updated system restores I/O perf to pre-update levels.
     
  4. Dragondale13

    Dragondale13 Maha Guru

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    It won't, but you'll see for yourself.
     

  5. nosirrahx

    nosirrahx Member Guru

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    I could take a look at that.
     
  6. 321Boom

    321Boom Member Guru

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    I'm interested in this too if you're willing to post results with the patches enabled and disabled.
     
  7. Agent-A01

    Agent-A01 Ancient Guru

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    The answer is yes, it does restore performance by disabling spectre protection.
     
  8. 321Boom

    321Boom Member Guru

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    Thanks for pitching in Agent-A01. Glad to know that's the answer since I've already been disabling these patches before a gaming and recording session, wouldn't want to find out I've been doing that for nothing. Appreciate your insight :)
     
  9. nosirrahx

    nosirrahx Member Guru

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    I have some free time today, I will take a look.
     
  10. nosirrahx

    nosirrahx Member Guru

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    Well.......that was interesting. Right up front I will need to stipulate that I ran the VROC bench 4 times and the 905P test 6 times just to convince myself that the results were consistent.

    It seems that the OS and BIOS improvements (once the mitigations are disabled) really did a lot to improve VROC 0 4KQ1T1 speed. On the down side this also means that what looks like a big drop in performance when going from 1709 + old BIOS to 1803 + new BIOS is actually far worse once disabling mitigation reveals the actual potential performance. VROC 0 compared to RAID 0 brings 4KQ1T1 to levels I would have assumed impossible. Of course you cant have this performance without turning off potentially critical security measures so I am not sure this actually good news.

    I have no idea what was going on with the 4KQ2T2 numbers on the 905P. They were very consistent and lead me to believe that perhaps my original testing was bad.

    All in all disabling mitigation clearly has positive results, far better than I expected actually. My expectation was that the numbers would end up between the unpatched and patched numbers.

    [​IMG]
     
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  11. nosirrahx

    nosirrahx Member Guru

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    After the next BIOS update and cumulative update I will being making my final build of my OS. I will be ripping a bunch of stuff out with the MSMG toolkit. It will be interesting to see if any removals (like defender and system restore) have any impact on performance. If anything interesting turns up I will post it here.
     
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  12. nosirrahx

    nosirrahx Member Guru

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    I did some testing on my NUC8i7HVK with 2 800P in RAID 0. Updates and BIOS are current, these are the results with protection enabled and disabled (pretty sure you can tell which one is which):

    [​IMG]
     
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  13. 321Boom

    321Boom Member Guru

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    @nosirrahx Thanks for taking the time to run these tests. Really appreciate it, very useful information.
     
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