Cannot reproduce with microcode 0xc6

By: Adrian (a.delete@this.acm.org), February 26, 2019 10:07 pm
Room: Moderated Discussions
Travis Downs (travis.downs.delete@this.gmail.com) on February 26, 2019 3:23 pm wrote:
>
> Maybe there was some microcode change which reduced performance
> for this type of load? Or maybe my box is just weird somehow?


On a less usual Skylake model with microcode 0x8a, the distribution was not bimodal, because there were no slow 18 cycle values.

This computer was not idle, but all the cores were busy about 10% ... 15% besides your test, because I could not stop some other programs which are executed there continuously.

I do not know if this has any influence on your test.


Some time later today I will also post the test results for a new Coffee Lake, bought one month ago, which should have a more recent microcode.




model name : Intel(R) Core(TM) i7-6770HQ CPU @ 2.60GHz
microcode : 0x8a

Testing method asm
0 64 128 192 256 320 384 448 512 576 640 704 768 832 896 960 1024 1088 1152 1216 1280 1344 1408 1472 1536 1600 1664 1728 1792 1856 1920 1984 2048
0 3.9 3.8 8.7 8.9 6.6 8.5 8.5 7.9 7.4 7.1 6.7 6.5 6.9 6.1 6.1 6.7 6.8 6.2 6.4 6.0 6.2 6.3 6.4 6.6 6.6 6.9 8.0 9.5 8.9 8.9 8.7 8.7 8.6
64 8.3 3.7 3.5 8.2 8.8 8.5 8.1 8.4 7.7 7.5 7.5 6.8 6.7 5.6 6.0 6.0 6.8 6.6 6.6 6.3 6.1 6.1 6.2 6.5 6.5 6.6 6.8 7.4 8.6 9.3 8.9 9.2 8.9
128 8.4 7.8 4.0 4.1 8.9 8.6 8.4 8.3 8.4 7.8 7.8 7.7 7.0 6.9 6.6 6.3 6.0 6.7 6.9 6.2 5.9 6.0 6.3 6.4 6.2 6.5 6.5 6.6 7.5 9.2 9.2 9.3 9.2
192 6.8 8.7 8.6 4.1 3.6 8.2 8.7 6.8 8.2 8.5 8.1 7.7 6.6 7.0 6.9 6.4 6.6 6.5 6.3 6.7 6.5 6.1 6.0 5.9 6.5 6.3 6.4 6.4 6.7 7.5 9.2 9.4 9.3
256 8.6 8.5 8.9 9.0 3.6 3.8 7.9 8.6 8.9 8.2 8.0 7.2 7.3 7.6 7.1 6.8 6.7 6.6 6.5 6.6 6.5 6.4 6.2 6.1 6.4 6.2 6.1 6.2 6.1 6.7 7.5 8.9 7.8
320 8.8 8.6 8.9 8.8 9.1 3.7 3.8 7.6 7.4 9.2 8.3 8.3 7.8 7.3 5.7 6.6 7.0 6.2 6.4 6.3 6.6 6.7 6.0 6.4 6.3 6.2 6.2 6.1 6.5 6.1 6.8 7.7 9.3
384 8.0 8.3 8.7 8.1 8.0 9.1 4.0 3.8 7.1 8.9 8.2 8.7 8.4 7.8 7.0 7.4 6.6 7.0 6.4 6.4 6.2 6.7 7.0 6.3 6.3 6.1 6.1 6.2 6.3 6.3 6.2 6.1 7.5
448 7.7 6.1 8.1 8.7 8.6 8.3 8.7 3.6 4.1 8.4 7.0 8.9 6.2 7.7 7.4 7.4 7.6 6.7 6.7 6.6 6.5 6.2 6.5 6.9 6.1 5.9 6.1 6.4 6.3 6.2 6.4 6.3 7.0
512 7.5 7.3 8.5 7.4 8.5 8.8 7.9 9.0 4.0 3.9 7.9 8.7 8.7 8.3 6.0 7.0 7.5 7.2 7.0 6.8 5.9 6.3 5.7 6.7 6.3 5.9 6.2 5.9 6.2 6.2 6.4 6.5 6.1
576 7.5 7.5 6.6 6.5 8.4 9.1 8.9 8.8 9.0 4.0 4.0 7.8 9.0 8.6 7.9 8.3 7.3 7.0 7.4 6.9 6.6 6.5 5.0 5.9 6.6 6.6 6.2 6.1 5.8 6.4 6.1 6.5 6.3
640 7.2 7.4 7.1 8.0 8.0 7.6 8.8 8.9 8.4 7.7 4.1 3.8 8.8 8.8 9.0 8.1 8.4 8.0 7.6 7.3 7.0 6.8 6.3 6.3 6.3 5.1 6.8 6.3 6.5 6.2 6.4 6.3 6.7
704 6.4 7.1 7.4 7.7 7.9 8.0 8.4 8.7 9.1 7.0 8.3 3.9 3.9 8.1 8.2 8.1 8.1 8.6 7.9 7.3 7.5 7.1 6.3 6.4 6.7 6.3 6.7 6.6 7.4 5.7 6.3 6.5 6.1
768 6.8 6.6 6.7 7.3 6.7 8.1 8.1 8.1 8.8 9.1 7.2 8.8 3.5 3.9 8.4 8.9 8.1 8.4 9.0 7.6 7.1 7.2 6.8 6.8 6.5 6.6 5.9 6.1 6.2 6.4 6.2 5.8 6.5
832 6.3 6.8 6.8 7.0 7.4 7.8 7.8 8.3 7.9 8.6 8.7 9.4 8.5 3.9 3.7 8.4 9.0 7.8 8.3 8.6 7.8 7.2 7.8 6.7 6.8 6.8 6.5 6.6 6.7 6.4 6.2 6.0 5.7
896 6.0 6.2 6.6 6.3 6.8 7.7 7.3 7.8 7.8 8.6 8.5 6.1 9.3 8.7 3.8 3.5 7.9 9.1 8.5 8.4 8.2 7.2 6.9 7.5 6.8 6.7 6.4 6.5 5.7 5.0 6.2 6.1 5.9
960 6.7 6.4 6.4 6.0 6.8 6.9 7.2 7.9 7.8 8.2 8.7 8.2 8.5 8.8 8.5 3.8 3.8 8.5 8.8 8.6 8.0 8.2 7.7 7.2 7.7 6.9 6.5 6.2 6.3 6.2 6.4 6.8 6.2
1024 7.7 6.5 6.7 6.4 6.4 6.9 7.0 7.0 8.1 7.8 7.7 8.4 9.0 8.4 8.6 8.9 3.7 3.6 8.3 8.8 8.9 6.2 8.4 7.5 7.1 7.6 6.7 6.6 5.8 6.6 6.3 6.9 6.8
1088 6.2 7.5 6.7 6.5 6.4 6.5 7.1 7.0 7.5 7.7 8.0 7.9 8.4 8.9 8.8 9.0 8.5 3.9 3.9 8.5 8.3 8.9 8.3 8.7 7.3 7.0 7.3 6.6 7.0 6.5 6.5 6.1 6.4
1152 6.3 6.2 7.6 6.8 6.5 6.4 6.5 7.2 7.1 7.4 7.4 8.2 8.2 8.8 8.3 8.6 9.2 8.9 3.7 3.7 8.6 8.5 8.8 8.4 8.2 7.8 7.2 7.4 6.9 7.0 6.0 6.5 6.2
1216 6.2 6.0 5.8 7.4 6.6 6.4 6.1 7.1 7.0 7.1 7.7 7.2 7.6 8.4 8.2 8.6 8.7 9.0 8.3 4.0 3.9 7.1 8.7 8.9 8.2 8.0 7.8 7.7 6.2 6.6 6.4 6.6 6.5
1280 6.2 6.0 6.1 6.2 7.4 6.5 6.2 6.5 6.6 7.0 6.7 7.1 7.6 7.0 8.1 8.6 6.2 8.1 7.0 8.3 3.8 3.7 8.0 8.5 8.7 8.2 8.2 7.9 7.2 7.4 6.9 6.7 6.3
1344 6.0 6.4 6.4 5.9 6.3 7.2 6.5 6.6 6.0 6.7 6.8 5.1 7.2 6.6 7.6 8.0 8.4 8.8 8.8 9.2 9.0 3.7 3.9 8.2 8.8 9.1 6.1 8.6 6.7 7.2 6.3 6.9 6.7
1408 6.2 6.4 6.2 6.4 5.9 6.0 7.2 7.1 6.3 6.4 6.4 6.7 6.8 7.0 8.2 8.1 8.3 8.6 8.7 8.6 8.8 8.1 4.0 3.6 8.3 8.2 8.8 8.8 8.2 6.9 7.7 7.6 7.1
1472 6.5 6.1 6.2 6.1 5.7 6.4 6.2 7.5 6.6 6.2 6.7 7.0 6.3 7.0 7.2 7.5 7.7 8.2 6.0 8.6 8.5 8.6 9.0 3.7 3.5 8.2 8.2 8.9 8.3 8.3 7.7 7.4 7.6
1536 6.8 6.6 6.2 6.2 6.2 6.2 6.2 6.3 7.4 7.1 6.2 6.5 6.6 6.9 6.7 6.5 7.6 7.7 7.2 8.6 8.6 8.6 9.3 8.4 3.4 3.9 8.1 9.2 6.6 8.2 8.4 6.2 6.7
1600 7.3 6.8 6.5 6.2 6.2 6.1 5.7 5.9 6.2 7.4 6.5 6.2 6.4 6.8 6.3 6.6 7.6 7.5 6.5 8.2 6.9 7.5 6.1 7.1 8.6 3.7 3.5 8.4 7.9 7.9 8.5 8.4 7.8
1664 8.2 7.3 6.5 6.1 6.2 6.4 6.5 6.3 6.1 5.9 6.9 5.9 6.5 6.3 6.1 6.5 7.0 7.3 8.0 8.0 8.1 8.6 8.8 8.1 9.1 6.8 4.1 3.8 8.3 8.6 8.4 8.6 8.1
1728 9.4 7.6 7.1 6.7 6.0 7.1 6.1 6.0 6.4 5.6 6.5 7.0 7.2 6.4 6.3 6.6 6.8 7.3 7.4 7.1 7.6 6.6 8.6 8.0 9.5 1.1 7.8 3.5 3.6 8.4 8.8 9.0 7.6
1792 8.2 9.5 8.6 7.3 6.8 6.7 6.1 6.1 6.3 6.2 5.8 6.3 7.7 6.8 6.6 6.2 6.9 7.1 7.2 7.6 8.0 7.8 8.1 8.5 8.9 8.1 8.6 7.8 3.9 4.0 8.4 8.7 8.8
1856 9.1 9.4 9.0 8.4 7.6 6.8 6.3 6.2 6.2 6.5 6.2 5.3 6.0 7.2 6.6 6.3 6.3 6.8 7.0 6.9 6.7 7.4 7.9 8.1 8.3 8.5 8.8 9.1 8.3 3.7 3.7 8.3 6.6
1920 8.8 9.3 9.8 9.6 8.3 7.1 6.4 6.1 6.8 6.5 6.2 6.4 6.2 6.0 7.3 6.1 6.5 6.9 6.2 6.8 7.1 6.2 6.4 7.8 8.1 6.2 8.4 8.9 9.4 8.1 3.9 3.6 6.9
1984 8.9 9.2 10.2 8.4 8.7 8.5 7.6 6.8 6.3 6.0 6.3 6.4 6.2 6.1 6.3 7.5 7.0 6.3 6.6 6.4 6.8 6.9 7.1 7.4 6.5 7.9 8.3 8.6 8.9 7.4 8.8 4.0 3.6
2048 9.1 9.5 9.3 9.5 9.8 8.1 8.5 7.2 6.8 6.6 5.9 6.3 6.1 5.7 6.2 6.2 7.2 6.9 6.4 6.5 6.5 6.6 7.0 6.8 6.7 7.3 7.9 6.8 8.5 9.0 8.2 6.6 3.7
2112 9.9 9.5 9.9 9.4 8.2 9.4 8.4 6.9 7.5 6.4 6.3 6.2 6.3 6.0 6.0 8.0 6.4 7.9 6.6 6.5 6.4 6.9 6.8 7.0 7.2 7.2 7.9 8.2 8.2 8.6 6.4 8.9 6.7
2176 9.2 9.6 9.4 9.8 9.6 8.8 8.1 9.6 8.3 7.9 6.9 6.3 6.0 6.2 6.2 6.0 6.3 6.4 7.2 6.9 6.7 7.7 6.5 6.4 7.1 7.2 6.7 7.1 7.9 8.8 6.3 7.9 6.8
2240 9.4 9.5 8.2 9.4 9.4 8.2 10.1 8.4 9.1 8.6 7.6 6.7 6.4 6.0 6.5 6.3 6.3 5.9 6.2 7.5 6.8 6.6 6.7 6.7 6.8 6.7 6.7 7.4 7.7 7.4 6.1 8.1 8.5


< Previous Post in ThreadNext Post in Thread >
TopicPosted ByDate
Why does writing to non-sequential lines in L2 perform so poorly?Travis2017/12/20 02:44 PM
  Bridges? Wells? (NT)Micahel S2017/12/20 03:53 PM
    Bridges? Wells? (NT)Travis2017/12/20 04:46 PM
      That should say "huh"? (NT)Travis2017/12/20 04:46 PM
        That should say "huh"?Jeff S.2017/12/20 05:11 PM
          That should say "huh"?Travis2017/12/20 06:34 PM
    Bridges? Wells?Jeff S.2017/12/20 05:17 PM
      Bridges? Wells?Travis2017/12/20 06:37 PM
    Bridges, Wells - positiveMichael S2017/12/21 02:52 AM
      Bridges, Wells - positiveTravis2017/12/21 09:35 AM
        Bridges, Wells - positiveMichael S2017/12/21 10:00 AM
  Why does writing to non-sequential lines in L2 perform so poorly?Linus Torvalds2017/12/20 06:18 PM
    Why does writing to non-sequential lines in L2 perform so poorly?Travis2017/12/20 06:54 PM
      Why does writing to non-sequential lines in L2 perform so poorly?Linus Torvalds2017/12/21 12:12 PM
        Why does writing to non-sequential lines in L2 perform so poorly?anon2017/12/22 03:29 AM
          Why does writing to non-sequential lines in L2 perform so poorly?Linus Torvalds2017/12/22 01:16 PM
            Why does writing to non-sequential lines in L2 perform so poorly?Travis2017/12/23 08:48 PM
            Why does writing to non-sequential lines in L2 perform so poorly?Travis Downs2020/06/13 03:18 PM
              Why does writing to non-sequential lines in L2 perform so poorly?John D. McCalpin2020/06/18 12:50 PM
                Why does writing to non-sequential lines in L2 perform so poorly?Travis Downs2020/06/18 05:32 PM
                  Why does writing to non-sequential lines in L2 perform so poorly?Travis Downs2020/06/18 05:34 PM
    Why does writing to non-sequential lines in L2 perform so poorly?anon.12017/12/21 06:09 PM
      Why does writing to non-sequential lines in L2 perform so poorly?Linus Torvalds2017/12/22 01:20 PM
        Why does writing to non-sequential lines in L2 perform so poorly?Travis2017/12/24 02:09 PM
  Why does writing to non-sequential lines in L2 perform so poorly?Travis2017/12/20 08:52 PM
    Why does writing to non-sequential lines in L2 perform so poorly?Adrian2017/12/21 12:09 AM
      Why does writing to non-sequential lines in L2 perform so poorly?Travis2017/12/21 09:23 AM
    Why does writing to non-sequential lines in L2 perform so poorly?-.-2017/12/27 03:53 AM
      Why does writing to non-sequential lines in L2 perform so poorly?-.-2017/12/27 03:53 AM
        Why does writing to non-sequential lines in L2 perform so poorly?Travis2017/12/27 04:18 PM
  Why does writing to non-sequential lines in L2 perform so poorly?Etienne2017/12/21 02:36 AM
    Why does writing to non-sequential lines in L2 perform so poorly?Michael S2017/12/21 02:58 AM
      Why does writing to non-sequential lines in L2 perform so poorly?Travis2017/12/21 09:26 AM
        Michael ignore my last question - saw your other reply (NT)Travis2017/12/21 09:27 AM
  Why does writing to non-sequential lines in L2 perform so poorly?Nksingg2017/12/26 06:47 AM
    Why does writing to non-sequential lines in L2 perform so poorly?David Kanter2017/12/26 11:48 AM
    Why does writing to non-sequential lines in L2 perform so poorly?Travis2017/12/27 04:33 PM
  Cannot reproduce with microcode 0xc6Travis Downs2019/02/26 04:23 PM
    Cannot reproduce with microcode 0xc6Adrian2019/02/26 09:35 PM
    Cannot reproduce with microcode 0xc6Adrian2019/02/26 10:07 PM
    Cannot reproduce with microcode 0xc6Adrian2019/02/27 05:02 AM
      Cannot reproduce with microcode 0xc6Travis Downs2019/02/27 08:25 AM
        Cannot reproduce with microcode 0xc6Adrian2019/02/28 01:16 AM
          Cannot reproduce with microcode 0xc6Travis Downs2019/03/07 06:51 PM
        Cannot reproduce with microcode 0xc6Adrian2019/02/28 09:54 AM
          Cannot reproduce with microcode 0xc6Travis Downs2019/03/24 06:34 PM
    Cannot reproduce with microcode 0xc6Travis Downs2019/02/27 03:20 PM
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