conbench-apache-arrow[bot] commented on PR #45612:
URL: https://github.com/apache/arrow/pull/45612#issuecomment-2697045304

   Thanks for your patience. Conbench analyzed the 4 benchmarking runs that 
have been run so far on PR commit 10098256578cecc37d1e3d704db28854ceb50c95.
   
   There were 25 benchmark results indicating a performance regression:
   
   - Pull Request Run on `amd64-c6a-4xlarge-linux` at [2025-03-04 
03:35:50Z](https://conbench.ursa.dev/compare/runs/8e37ebdc402041be8122a94172ab631d...2f44693fa6794739a75d3f1b7f43a7a5/)
     - [`BM_DefinitionLevelsToBitmapRepeatedAllPresent` (C++) with 
source=cpp-micro, 
suite=parquet-level-conversion-benchmark](https://conbench.ursa.dev/compare/benchmarks/067b828c670b7c82800040ffbfaa8475...067c6757e57870b3800073b11e505693)
   
   - Pull Request Run on `arm64-t4g-2xlarge-linux` at [2025-03-04 
05:02:38Z](https://conbench.ursa.dev/compare/runs/939688dd00134eb38889c863b01f5d69...83eb0094b33648b5b61e4381f644253f/)
     - [`ReferenceWorkloadCost` (C++) with params=task_cost:10000/real_time, 
source=cpp-micro, 
suite=arrow-thread-pool-benchmark](https://conbench.ursa.dev/compare/benchmarks/067b82e5dc987cb28000117fc0a04b82...067c67ad488270438000b0fe286ad77a)
   - and 23 more (see the report linked below)
   
   The [full Conbench report](https://github.com/apache/arrow/runs/38162141952) 
has more details.


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