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34dbc618f5
Holding a dbuf is a common operation which can become highly contended in dbuf_find() when acquiring the dbuf hash mutex. This is particularly true on Linux when reading/writing volumes since by default up to 32 threads from the zvol_taskq may be taking a hold of the same dbuf. This should also be observable on FreeBSD as long as there are enough processes accessing the volume concurrently. This is further aggregrated by the fact that only the block id will be unique when calculating the dbuf hash for a single volume. The objset id, object id, and level will be the same for data blocks. This has been observed to result in a somehwat less than uniform hash distribution and a longer than expected max hash chain depth (~20) on a large memory system (256 GB) using volumes. This commit improves the siutation by switching the hash mutex to an rwlock to allow concurrent lookups, and increasing DBUF_RWLOCKS from 2048 to 8192 to further reduce the odds of a hash collision. Reviewed-by: Tony Hutter <hutter2@llnl.gov> Reviewed-by: Alexander Motin <mav@FreeBSD.org> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #13405 |
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