RHEL6: NFSv3 READDIRPLUS drastically slows down globbing over a NFS directory leading to performance problems
Issue
- RHEL 6.2 with a standard mount, a glob in a directory containing over 3000 directories takes 218 seconds (nearly four minutes).
- A mount of the same directory using the
nordirplusoption to disable the use of readdirplus calls, a glob on the same directory takes only 1.7 seconds - As a result of the many READDIRPLUS calls, performance of other processes are affected
- A
touchof a file in a directory with hundreds of thousands of files may take several minutes
Environment
- Red Hat Enterprise Linux (RHEL) 6
- RHEL6.2 and RHEL6.3 kernels (others may be affected)
- NFS client
- NFSv3
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