Readdir ls -lU graphs
From Linux NFS
Revision as of 19:19, 7 April 2011 by Amschuma
36: Linux 2.6.36 36NORC: Linux 2.6.36 (without readdir cap) 38: Linux 2.6.38 38RC: Linux 2.6.38 (with readdir cap added back) 38NB: Linux 2.6.38 (with Neil Brown's patch and loop detection)
- 2.6.36 kernels take longer than 2.6.38 kernels.
- Falling back to readdir operations for large directories makes this command take longer. Removing the readdir plus cap from 2.6.36 improves performance, but doesn't match 2.6.38 kernels. Adding a readdir plus cap to 2.6.38 doubles the time needed for this command to complete.
- Kernels issue the same number of RPC operations in this case
- Falling back to readdir on large directories can lead to thousands of extra RPC operations