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Postponing entry removal from the DDT log in case of hit till later single-threaded sync stage allows to make ddl_tree stable during multi-threaded ZIO processing stage. It allows to drop the DDT lock before the search instead of after, reducing the contention a lot. Actually ddt_log_update_entry() was already handling the case of entry present in the active log, so we only need to remove it from flushing log, if the entry happen to be there. My tests with parallel 4KB block writes show throughput increase from 480MB/s (122K blocks/s) to 827MB/s (212K blocks/s), even though still limited by the global DDT lock contention. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Alexander Motin <alexander.motin@TrueNAS.com> Closes #18044 |
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