Re: About the memcpy optimization patch

Hi Fengwei,

Thanks for the report. I think we would be interested in knowing the nature of the test being used.

I've added Bero to the CC as I'm sure he'll be interested as well.

On Thu, Jul 2, 2015 at 9:35 PM, yfw fengwei.yin@linaro.org wrote:

Hi, About the patch http://review.android.git.linaro.org/#/c/15529/, we got an issue report from member. It could improve the micro benchmark but hurt general benchmark actually. Here is their test result:

bionic-benchmarks32 BM_string_memcpy:
Size  AOSP    Linaro  Perf Improvement
8     450.7   329.5   -37%
64    1715.7  2225.3  23%
512   3100.7  4253.0  27%
1K    3271.8  4652.3  30%
8K    2460.9  3174.7  22%
16K   2267.4  2953.2  23%
32K   2222.9  2800.7  21%
64K   2204.3  2640.1  17%

                without patch   with patch  perf delta
Quadrant mem    3400            2100        -38%
GeekBench3
  single-core   436             260         -40%
  multi-core    434             358         -18%

I am wondering whether this is an known issue or not for this list. Thanks in advance.

Regards Yin, Fengwei _______________________________________________ linaro-android mailing list linaro-android@lists.linaro.org https://lists.linaro.org/mailman/listinfo/linaro-android