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Bryan Agee
Asked: 2013-01-29 23:42:26 +0800 CST

Does enabling ACLs have an effect on performance?

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I'm looking at a web application that needs ACLs enabled. Are there any benchmarks or other documents to show what potential impact ACL does{n't} have when the file system is under heavy load?

Also, does it matter what filesystem you use with ACLs?

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1 Answers

  1. I got stuck with a similar question and found this Usenix article which has a section EA and ACL Performance discussing a comparison of time taken with and without ACLs. Also compares this for different file systems, which shows interestingly that XFS-512(inode size) and JFS do not cause a performance impact.

    So definitely the ACLs cause a performance degradation depending on the file system type but it also depends on your production load, server resource and how much overhead is acceptable.

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