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[Anders Hall <hall79@xxxxxxxxx>]

Hey John. We had the same problem with extremely low load. Some form of
leak. Never found a good solution (besides reboot when leak reaches
critical as a work around). For the exact same purpose (code/file
transfers) running on Ubuntu 14.04 is much better. I recommend you
upgrade unless you can fix it yourself. Seldom admins pick up these
older bugs.

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https://bugs.launchpad.net/bugs/1047566

Title:
  Memory leaks when using NFS

Status in “linux” package in Ubuntu:
  Incomplete

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
  options.

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

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