Readdir ls -lU graphs

From Linux NFS

Revision as of 17:57, 7 April 2011 (view source) Amschuma (Talk | contribs) (→NFS v3) ← Older edit		Revision as of 18:06, 7 April 2011 (view source) Amschuma (Talk | contribs) (→NFS v4) Newer edit →
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	* [[File:v4_ls_lU_noplus_sys.jpg]]		* [[File:v4_ls_lU_noplus_sys.jpg]]
	* [[File:v4_ls_lU_plus_sys.jpg]]		* [[File:v4_ls_lU_plus_sys.jpg]]
		+	** Using readdir plus on 2.6.38 kernels decreases time spent in the kernel
	== RPC ops ==		== RPC ops ==

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Revision as of 18:06, 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 1 Real 1.1 NFS v3 1.2 NFS v4 2 Sys 2.1 NFS v3 2.2 NFS v4 3 RPC ops 3.1 NFS v3 3.2 NFS v4

Real

NFS v3

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  • 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.

NFS v4

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Sys

NFS v3

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NFS v4

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  • Using readdir plus on 2.6.38 kernels decreases time spent in the kernel

RPC ops

NFS v3

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NFS v4

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