Most of the CPU being consumed is in strcmp()

-   99.39%     0.00%  zfs        [kernel.kallsyms]   [k] zfsdev_ioctl                                                                                       ▒
   - 99.39% zfsdev_ioctl                                                                                                                                    
      - 99.34% zfs_ioc_objset_stats                                                                                                                         
         - 99.22% zfs_ioc_objset_stats_impl.part.20                                                                                                         
            - 99.01% dmu_objset_stats                                                                                                                       
               - 99.00% dsl_dataset_stats                                                                                                                   
                  - 98.98% get_clones_stat                                                                                                                  
                     - 62.55% fnvlist_add_nvlist                                                                                                            
                          nvlist_add_nvlist                                                                                                                 
                          nvlist_add_common.part.51                                                                                                         
                          nvlist_copy_embedded.isra.54                                                                                                      
                        - nvlist_copy_pairs.isra.52                                                                                                         
                           - 62.52% nvlist_add_common.part.51                                                                                               
                              - 31.25% nvlist_copy_embedded.isra.54                                                                                         
                                 - nvlist_copy_pairs.isra.52                                                                                                
                                    - 31.23% nvlist_add_common.part.51                                                                                      
                                       - 30.78% nvlist_remove_all.part.49                                                                                   
                                            strcmp                                                                                                          
                              - 30.86% nvlist_remove_all.part.49                                                                                            
                                   strcmp                                                                                                                   
                     - 31.73% fnvlist_add_boolean                                                                                                           
                        - nvlist_add_boolean                                                                                                                
                           - 31.72% nvlist_add_common.part.51                                                                                               
                              - 31.33% nvlist_remove_all.part.49                                                                                            
                                   strcmp                                                                                                                   
                     + 4.16% dsl_dataset_hold_obj