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ranges_lock
2007 Feb 12
17
NFS/ZFS performance problems - txg_wait_open() deadlocks?
...;txg_wait_open+"
360
bash-3.00# cat nfsd.txt | grep "txg_wait_open+" | grep -c "337d1e"
360
So all those txg_wait_open are for the same transaction group - txg_wait_open+0x58(6000ad0c910, 337d1e,
All the other threads were in:
bash-3.00# cat nfsd.txt | grep -c "zfs_range_lock_reader+"
289
Several different dnodes (however several threads to the same dnode).
Also using ''zpool iostat 1'' while nfsd was shuting down I could see mostly reads and some writes every 40-60s.
Why nfsd was closing for almost 3 minutes? Because we were sitting in txg_wait_...