On 09/07/2021 15:24, Ming Lei wrote:

quoted

associated compromises.

Follows the log of 'perf report'

1) good(run fio from cpus in the nvme's numa node)

Hi Ming,

If you're still interested in this issue, as an experiment only you can 
try my rebased patches here:

https://github.com/hisilicon/kernel-dev/commits/private-topic-smmu-5.14-cmdq-4

I think that you should see a significant performance boost.

Thanks
John

-   34.86%     1.73%  fio       [nvme]              [k] nvme_process_cq                                                      ▒
    - 33.13% nvme_process_cq                                                                                                  ▒
       - 32.93% nvme_pci_complete_rq                                                                                          ▒
          - 24.92% nvme_unmap_data                                                                                            ▒
             - 20.08% dma_unmap_sg_attrs                                                                                      ▒
                - 19.79% iommu_dma_unmap_sg                                                                                   ▒
                   - 19.55% __iommu_dma_unmap                                                                                 ▒
                      - 16.86% arm_smmu_iotlb_sync                                                                            ▒
                         - 16.81% arm_smmu_tlb_inv_range_domain                                                               ▒
                            - 14.73% __arm_smmu_tlb_inv_range                                                                 ▒
                                 14.44% arm_smmu_cmdq_issue_cmdlist                                                           ▒
                              0.89% __pi_memset                                                                               ▒
                              0.75% arm_smmu_atc_inv_domain                                                                   ▒
                      + 1.58% iommu_unmap_fast                                                                                ▒
                      + 0.71% iommu_dma_free_iova                                                                             ▒
             - 3.25% dma_unmap_page_attrs                                                                                     ▒
                - 3.21% iommu_dma_unmap_page                                                                                  ▒
                   - 3.14% __iommu_dma_unmap_swiotlb                                                                          ▒
                      - 2.86% __iommu_dma_unmap                                                                               ▒
                         - 2.48% arm_smmu_iotlb_sync                                                                          ▒
                            - 2.47% arm_smmu_tlb_inv_range_domain                                                             ▒
                               - 2.19% __arm_smmu_tlb_inv_range                                                               ▒
                                    2.16% arm_smmu_cmdq_issue_cmdlist                                                         ▒
             + 1.34% mempool_free                                                                                             ▒
          + 7.68% nvme_complete_rq                                                                                            ▒
    + 1.73% _start


2) bad(run fio from cpus not in the nvme's numa node)
-   49.25%     3.03%  fio       [nvme]              [k] nvme_process_cq                                                      ▒
    - 46.22% nvme_process_cq                                                                                                  ▒
       - 46.07% nvme_pci_complete_rq                                                                                          ▒
          - 41.02% nvme_unmap_data                                                                                            ▒
             - 34.92% dma_unmap_sg_attrs                                                                                      ▒
                - 34.75% iommu_dma_unmap_sg                                                                                   ▒
                   - 34.58% __iommu_dma_unmap                                                                                 ▒
                      - 33.04% arm_smmu_iotlb_sync                                                                            ▒
                         - 33.00% arm_smmu_tlb_inv_range_domain                                                               ▒
                            - 31.86% __arm_smmu_tlb_inv_range                                                                 ▒
                                 31.71% arm_smmu_cmdq_issue_cmdlist                                                           ▒
                      + 0.90% iommu_unmap_fast                                                                                ▒
             - 5.17% dma_unmap_page_attrs                                                                                     ▒
                - 5.15% iommu_dma_unmap_page                                                                                  ▒
                   - 5.12% __iommu_dma_unmap_swiotlb                                                                          ▒
                      - 5.05% __iommu_dma_unmap                                                                               ▒
                         - 4.86% arm_smmu_iotlb_sync                                                                          ▒
                            - 4.85% arm_smmu_tlb_inv_range_domain                                                             ▒
                               - 4.70% __arm_smmu_tlb_inv_range                                                               ▒
                                    4.67% arm_smmu_cmdq_issue_cmdlist                                                         ▒
             + 0.74% mempool_free                                                                                             ▒
          + 4.83% nvme_complete_rq                                                                                            ▒
    + 3.03% _start

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