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[John Greenhalgh <john.greenhalgh@xxxxxxxxx>]

Has there been any progress on this bug? I'm seeing the same issue as
the first poster, with a very similar setup (thousands of files with
heavy reading - serving php files and static hml/images). The NFS server
is running 12.04.4 LTS with kernel 3.2.0-67-virtual #101-Ubuntu SMP in
EC2. The the SUnreclaim takes 7GB worth of memory in about 1 week.
Slabtop reports increasing idr_layer_cache.

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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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