Readdir ls -U graphs

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(NFS v3)
(NFS v3)
Line 30: Line 30:
=== NFS v3 ===
=== NFS v3 ===
* [[File:v3_ls_U_noplus_rpc.jpg]]
* [[File:v3_ls_U_noplus_rpc.jpg]]
 +
** 2.6.36 uses fewer RPC operations than 2.6.38
* [[File:v3_ls_U_plus_rpc.jpg]]
* [[File:v3_ls_U_plus_rpc.jpg]]
 +
** Kernels using readdir for large directories issue fewer RPC operations than kernels using readdir plus
 +
=== NFS v4 ===
=== NFS v4 ===
* [[File:v4_ls_U_noplus_rpc.jpg]]
* [[File:v4_ls_U_noplus_rpc.jpg]]
* [[File:v4_ls_U_plus_rpc.jpg]]
* [[File:v4_ls_U_plus_rpc.jpg]]

Revision as of 18:24, 7 April 2011

    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 ls U noplus real.jpg
  • V3 ls U plus real.jpg
    • In this case, using readdir plus increases the time required for the command to complete.

NFS v4

  • V4 ls U noplus real.jpg
  • V4 ls U plus real.jpg

Sys

NFS v3

  • V3 ls U noplus sys.jpg
  • V3 ls U plus sys.jpg
    • Using readdir plus causes the command to spend more time in the kernel

NFS v4

  • V4 ls U noplus sys.jpg
  • V4 ls U plus sys.jpg

RPC ops

NFS v3

  • V3 ls U noplus rpc.jpg
    • 2.6.36 uses fewer RPC operations than 2.6.38
  • V3 ls U plus rpc.jpg
    • Kernels using readdir for large directories issue fewer RPC operations than kernels using readdir plus

NFS v4

  • V4 ls U noplus rpc.jpg
  • V4 ls U plus rpc.jpg
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