Matthew Ahrens 516a08ebb4 fat zap should prefetch when iterating ... When iterating over a ZAP object, we're almost always certain to iterate over the entire object. If there are multiple leaf blocks, we can realize a performance win by issuing reads for all the leaf blocks in parallel when the iteration begins. For example, if we have 10,000 snapshots, "zfs destroy -nv pool/fs@1%9999" can take 30 minutes when the cache is cold. This change provides a >3x performance improvement, by issuing the reads for all ~64 blocks of each ZAP object in parallel. Reviewed-by: Andreas Dilger <andreas.dilger@whamcloud.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Matthew Ahrens <mahrens@delphix.com> External-issue: DLPX-58347 Closes #8862		2019-09-25 11:27:47 -07:00
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man1	Fixed a small typo in man/man1/raidz_test.1	2019-06-07 12:45:40 -07:00
man5	fat zap should prefetch when iterating	2019-09-25 11:27:47 -07:00
man8	Correct man page dates	2019-05-08 10:59:32 -07:00
Makefile.am	Prepare SPL repo to merge with ZFS repo	2018-05-29 14:51:39 -07:00