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Alexander Motin
23fad19818
Looking on txg_wait_synced(, 0) I've noticed that it always syncs 5 TXGs: 3 TXG_CONCURRENT_STATES + 2 TXG_DEFER_SIZE. But in case of dmu_offset_next() we do not care about deferred frees. And even concurrent TXGs we might not need sync all 3 if the dnode was not dirtied in last few TXGs. This patch makes dmu_offset_next() to sync one TXG at a time until the dnode is clean, but no more than 3 TXG_CONCURRENT_STATES times. My tests with random simultaneous writes and seeks over many files on HDD pool show 7-14% performance increase. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Rob Norris <robn@despairlabs.com> Signed-off-by: Alexander Motin <mav@FreeBSD.org> Sponsored by: iXsystems, Inc. Closes #17434