[Bug 1047566] Re: Memory leaks when using NFS

Dmitry Nikiforov dmitryn at dynamiclogic.com
Thu Sep 13 14:18:19 UTC 2012

I was hesitant to say that this is definitely an NFS issue, since it
might also be an EXT4 issue (judging by the fact that ext4_inode_cache
is the second largest slab)...

Need to test this without EXT4.

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  Memory leaks when using NFS

Status in “nfs-utils” package in Ubuntu:

Bug description:
  When using Ubuntu Server 12.04 with or without the latest updates
  (kernels 3.2.0-23 and 3.2.0-29, x86_64) as an NFS server with fairly
  heavy reading activity from clients (no writing), from a volume with a
  lot of small files, split into many subdirectories (with about 5-10
  files or subdirectories per directory, in a tree-like structure not
  unlike that of Squid proxy), available memory is quickly exhausted,
  however no single process shows that much memory being used, nor does
  the "buffers" or "cached" in "free" command output. The server
  eventually runs out of memory and crashes.

  slabtop shows that majority of memory is being used by idr_layer_cache
  (3.6G on a sever with 4G of RAM shortly before the kernel started
  killing processes and eventually crashed).

  The filesystem being shared is ext4. Clients (also the same version of
  Ubuntu Server) mount the volume in read-only mode, with default

  P.S. Also tried i386 version, with the same result.

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