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Currently, even though send_reader_thread prefetches spill block, do_dump() will not use it and issues its own blocking arc_read. This causes significant performance degradation when sending datasets with lots of spill blocks. For unmodified spill blocks, we also create send_range struct for them in send_reader_thread and issue prefetches for them. We piggyback them on the dnode send_range instead of enqueueing them so we don't break send_range_after check. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Alexander Motin <mav@FreeBSD.org> Signed-off-by: Chunwei Chen <david.chen@nutanix.com> Co-authored-by: david.chen <david.chen@nutanix.com> Closes #16701 |
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