Readdir rm -rf graphs

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Revision as of 18:36, 7 April 2011 by Amschuma (Talk | contribs)
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    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)

Contents

Real

NFS v3

  • V3 rm rf noplus real.jpg
    • Without readdir plus, an unmodified 2.6.38 kernel takes longer to remove a large directory than the other kernels
  • V3 rm rf plus real.jpg
    • Using readdir plus removes large directories faster than using a simple readdir.

NFS v4

  • V4 rm rf noplus real.jpg
    • Kernels perform the same without readdir plus
  • V4 rm rf plus real.jpg
    • With readdir plus enabled, the kernels take about the same amount of time to remove the directory.

Sys

NFS v3

  • V3 rm rf noplus sys.jpg
    • The command takes about the same amount of kernel time for each tested kernel.
  • V3 rm rf plus sys.jpg
  • Using readdir plus decreases the kernel time needed to complete the command

NFS v4

  • V4 rm rf noplus sys.jpg
  • V4 rm rf plus sys.jpg

RPC ops

NFS v3

  • V3 rm rf noplus rpc.jpg
  • V3 rm rf plus rpc.jpg

NFS v4

  • V4 rm rf noplus rpc.jpg
  • V4 rm rf plus rpc.jpg
Retrieved from "http://wiki.linux-nfs.org/wiki/index.php/Readdir_rm_-rf_graphs"
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