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1ac7d194e5
Issuing several scrub reads for a block we may use the parent ZIO buffer for one of child ZIOs. If that read complete successfully, then we won't need to copy the data explicitly. If block has only one copy (typical for root vdev, which is also a mirror inside), then we never need to copy -- succeed or fail as-is. Previous code also copied data from buffer of every successfully completed child ZIO, but that just does not make any sense. On healthy N-wide mirror this saves all N+1 (or even more in case of ditto blocks) memory copies for each scrubbed block, allowing CPU to focus mostly on check-summing. For other vdev types it should save one memory copy per block copy at root vdev. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Mark Maybee <mark.maybee@delphix.com> Signed-off-by: Alexander Motin <mav@FreeBSD.org> Sponsored-By: iXsystems, Inc. Closes #13606 |
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