dc5c8006f6
During snapshot deletion ZFS may issue several reads for each deadlist to merge them into next snapshot's or pool's bpobj. Number of the dead lists increases with number of snapshots. On HDD pools it may take significant time during which sync thread is blocked. This patch introduces prescient prefetch of required blocks for up to 128 deadlists ahead. Tests show reduction of time required to delete dataset with 720 snapshots with randomly overwritten file on wide HDD pool from 75-85 to 22-28 seconds. Reviewed-by: Allan Jude <allan@klarasystems.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Alexander Motin <mav@FreeBSD.org> Sponsored by: iXsystems, Inc. Issue #14276 Closes #14402 |
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| zcommon | ||
| zfs | ||
| zstd | ||
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