I could not reproduce this problem, and will need some sort of
reproduction procedure in order to pursue it further.
I created a filesystem with 680666 randomly named 4k files, spread out
among 6811 nested directories at a max depth of 5 levels of directories.
I exported the filesystem using the following options
/nfs 192.168.122.1/24(rw,no_root_squash,no_subtree_check,async)
And mounted it with the following mount options.
(rw,vers=4,addr=192.168.122.186,clientaddr=192.168.122.115)
I then spawned 10 threads on the client running
<<<<<<<<<<<<<<<<<<<<<<<<
#!/bin/bash
find ./ -type f | while read line
do
cat $line > /dev/null
done
>>>>>>>>>>>>>>>>>>>>>>>>
I could not get the idr_layer_cache to increase above 890k. I am
running the following kernel- 3.2.0-53-virtual.
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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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