Linux: Inode Cache Performance

Posted by dave on Dec 28, 2004 9:15 AM EDT
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An interesting dicussion on the lkml examined the efficiency of the inode cache in the 2.4 Linux kernel, discussing several tunables primarily helpful to systems serving large NFS or Samba mounts. In particular, a slowdown was reported on such a system easily reproducible by doing a find / while cat'ing large files to /dev/null. In a discussion between 2.4 maintainer Marcelo Tosatti, 2.6 maintainer Andrew Morton and VM maintainer Andrea Arcangeli, it was decided that this was likely due to too small of an inode cache hash table resulting in a large number of collisions. For the work case in question, some tunables looked to prove helpful. Going forward, effort might be made in 2.6 or beyond to improve the inode cache.

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