Cannot reproduce with microcode 0xc6

By: Adrian (a.delete@this.acm.org), February 28, 2019 8:54 am
Room: Moderated Discussions
Travis Downs (travis.downs.delete@this.gmail.com) on February 27, 2019 7:25 am wrote:
>
> You can reverse the behavior, showing the max value by setting W_MAX envvar to 1, like so:
>
> W_MAX=1 ./offset-test.sh
>
> If you have the chance to run the CoffeeLake test again like this I would be very interested.
>


I have done the test again on the Coffee Lake.

I have repeated it a few times without seeing anything except maybe a shift by about half cycle towards higher values. There was still no value over 10.


Then I opened a file manager and I have started to do random clicks on directories or files.

This caused immediately a few 18 cycle values, one precisely when I opened the file manager and a few others exactly when doing various clicks. Not all clicks had effects.


So I assume that this happens due to some interaction with the cache activity of the other threads. I still wonder why with the old microcode it happened so reproducible at certain positions even without much activity on the computer.



Like I have written in the other message, with W_MAX=1 and the old microcode there were some extra neighboring positions where the 18 cycle values appeared frequently, but not reproducible when the test was repeated.
















< Previous Post in ThreadNext Post in Thread >
TopicPosted ByDate
Why does writing to non-sequential lines in L2 perform so poorly?Travis2017/12/20 01:44 PM
  Bridges? Wells? (NT)Micahel S2017/12/20 02:53 PM
    Bridges? Wells? (NT)Travis2017/12/20 03:46 PM
      That should say "huh"? (NT)Travis2017/12/20 03:46 PM
        That should say "huh"?Jeff S.2017/12/20 04:11 PM
          That should say "huh"?Travis2017/12/20 05:34 PM
    Bridges? Wells?Jeff S.2017/12/20 04:17 PM
      Bridges? Wells?Travis2017/12/20 05:37 PM
    Bridges, Wells - positiveMichael S2017/12/21 01:52 AM
      Bridges, Wells - positiveTravis2017/12/21 08:35 AM
        Bridges, Wells - positiveMichael S2017/12/21 09:00 AM
  Why does writing to non-sequential lines in L2 perform so poorly?Linus Torvalds2017/12/20 05:18 PM
    Why does writing to non-sequential lines in L2 perform so poorly?Travis2017/12/20 05:54 PM
      Why does writing to non-sequential lines in L2 perform so poorly?Linus Torvalds2017/12/21 11:12 AM
        Why does writing to non-sequential lines in L2 perform so poorly?anon2017/12/22 02:29 AM
          Why does writing to non-sequential lines in L2 perform so poorly?Linus Torvalds2017/12/22 12:16 PM
            Why does writing to non-sequential lines in L2 perform so poorly?Travis2017/12/23 07:48 PM
            Why does writing to non-sequential lines in L2 perform so poorly?Travis Downs2020/06/13 02:18 PM
              Why does writing to non-sequential lines in L2 perform so poorly?John D. McCalpin2020/06/18 11:50 AM
                Why does writing to non-sequential lines in L2 perform so poorly?Travis Downs2020/06/18 04:32 PM
                  Why does writing to non-sequential lines in L2 perform so poorly?Travis Downs2020/06/18 04:34 PM
    Why does writing to non-sequential lines in L2 perform so poorly?anon.12017/12/21 05:09 PM
      Why does writing to non-sequential lines in L2 perform so poorly?Linus Torvalds2017/12/22 12:20 PM
        Why does writing to non-sequential lines in L2 perform so poorly?Travis2017/12/24 01:09 PM
  Why does writing to non-sequential lines in L2 perform so poorly?Travis2017/12/20 07:52 PM
    Why does writing to non-sequential lines in L2 perform so poorly?Adrian2017/12/20 11:09 PM
      Why does writing to non-sequential lines in L2 perform so poorly?Travis2017/12/21 08:23 AM
    Why does writing to non-sequential lines in L2 perform so poorly?-.-2017/12/27 02:53 AM
      Why does writing to non-sequential lines in L2 perform so poorly?-.-2017/12/27 02:53 AM
        Why does writing to non-sequential lines in L2 perform so poorly?Travis2017/12/27 03:18 PM
  Why does writing to non-sequential lines in L2 perform so poorly?Etienne2017/12/21 01:36 AM
    Why does writing to non-sequential lines in L2 perform so poorly?Michael S2017/12/21 01:58 AM
      Why does writing to non-sequential lines in L2 perform so poorly?Travis2017/12/21 08:26 AM
        Michael ignore my last question - saw your other reply (NT)Travis2017/12/21 08:27 AM
  Why does writing to non-sequential lines in L2 perform so poorly?Nksingg2017/12/26 05:47 AM
    Why does writing to non-sequential lines in L2 perform so poorly?David Kanter2017/12/26 10:48 AM
    Why does writing to non-sequential lines in L2 perform so poorly?Travis2017/12/27 03:33 PM
  Cannot reproduce with microcode 0xc6Travis Downs2019/02/26 03:23 PM
    Cannot reproduce with microcode 0xc6Adrian2019/02/26 08:35 PM
    Cannot reproduce with microcode 0xc6Adrian2019/02/26 09:07 PM
    Cannot reproduce with microcode 0xc6Adrian2019/02/27 04:02 AM
      Cannot reproduce with microcode 0xc6Travis Downs2019/02/27 07:25 AM
        Cannot reproduce with microcode 0xc6Adrian2019/02/28 12:16 AM
          Cannot reproduce with microcode 0xc6Travis Downs2019/03/07 05:51 PM
        Cannot reproduce with microcode 0xc6Adrian2019/02/28 08:54 AM
          Cannot reproduce with microcode 0xc6Travis Downs2019/03/24 05:34 PM
    Cannot reproduce with microcode 0xc6Travis Downs2019/02/27 02:20 PM
Reply to this Topic
Name:
Email:
Topic:
Body: No Text
How do you spell tangerine? ūüćä