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Adam D. Moss
edd23dba81
Prefetching of dnodes in dbuf_read() can cause significant mutex contention for some workloads and isn't very helpful. This is because we already get 32 dnodes for each block read, and when iterating over a directory we prefetch the dnodes in the directory. Disable this prefetching to prevent the lock contention. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Submitted-by: Adam Moss <c@yotes.com> Submitted-by: Matthew Ahrens <mahrens@delphix.com> Signed-off-by: Adam Moss <c@yotes.com> Closes #10877 Closes #10953