In FreeBSD , allowing search operations in VFS without locks (lockless lookup). Optimizations have been implemented for file systems , and , but it currently does not extend to ACL, Capsicum, access to file descriptors, symbolic links, and ".." in paths. For the specified capabilities, a rollback to the old file identification mechanism is performed.
A test conducted on TmpFS measuring access times to different files demonstrated an increase in performance from 2,165,816 to 151,216,530 operations per second (a 69-fold increase). Another test showed a reduction in task execution time from 23 to 14 seconds.
Source: opennet.ru
