Re: [linux-next:master] [mm] 1111d46b5c: stress-ng.pthread.ops_per_sec -84.3% regression

["Yin, Fengwei" <fengwei.yin@intel.com>]

On 12/21/2023 8:58 AM, Yin Fengwei wrote:
> But what I am not sure was whether it's worthy to do such kind of change
> as the regression only is seen obviously in micro-benchmark. No evidence
> showed the other regressionsin this report is related with madvise. At
> least from the perf statstics. Need to check more on stream/ramspeed. 
> Thanks.

With debugging patch (filter out the stack mapping from THP aligned),
the result of stream can be restored to around 2%:

commit:
   30749e6fbb3d391a7939ac347e9612afe8c26e94
   1111d46b5cbad57486e7a3fab75888accac2f072
   89f60532d82b9ecd39303a74589f76e4758f176f  -> 1111d46b5cbad with 
debugging patch

30749e6fbb3d391a 1111d46b5cbad57486e7a3fab75 89f60532d82b9ecd39303a74589
---------------- --------------------------- ---------------------------
     350993           -15.6%     296081 ±  2%      -1.5%     345689 
   stream.add_bandwidth_MBps
     349830           -16.1%     293492 ±  2%      -2.3%     341860 ± 
2%  stream.add_bandwidth_MBps_harmonicMean
     333973           -20.5%     265439 ±  3%      -1.7%     328403 
   stream.copy_bandwidth_MBps
     332930           -21.7%     260548 ±  3%      -2.5%     324711 ± 
2%  stream.copy_bandwidth_MBps_harmonicMean
     302788           -16.2%     253817 ±  2%      -1.4%     298421 
   stream.scale_bandwidth_MBps
     302157           -17.1%     250577 ±  2%      -2.0%     296054 
   stream.scale_bandwidth_MBps_harmonicMean
     339047           -12.1%     298061            -1.4%     334206 
   stream.triad_bandwidth_MBps
     338186           -12.4%     296218            -2.0%     331469 
   stream.triad_bandwidth_MBps_harmonicMean


The regression of ramspeed is still there.


Regards
Yin, Fengwei