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aquiring
2009 Jun 08
1
[SUGGESSTION 1/1] OCFS2: automatic dlm hash table size
.... the often used lookup is performed on the hash table.
problem:
for usages that there are huge number of inodes(thus huge number of dlm_lock_resource objects) in a ocfs2 volume, the lookup performance becomes a problem. the lookup holds spin_lock which could put all others cpus into the state of aquring the spinlock. if the lock is held long enough by the lookup process, some hardware watchdog could reboot box since it's not fed in a time(the fed has no change to be scheduled).
enlarging the hash table is the way to speed up the lookup. but we don't know how large is a good size. --too...