[Bug 561210] Re: Writing big files to NFS target causes system lock up

[Alex]

@Andy Whitcroft

Your sysctl setting on its own did not solve the problem for me. However
while I was googling for vm.min_free_kbytes to check out what it
actually does, I came across this site:
http://russ.garrett.co.uk/2009/01/01/linux-kernel-tuning/

So I set these values on both, the server and the client:

## increase amount of kernel memory
vm.min_free_kbytes = 65536

## increase TCP max buffer size
net.core.rmem_max = 16777216
net.core.wmem_max = 16777216

## increase TCP autotuning buffer limits
net.ipv4.tcp_rmem = 4096 87380 16777216
net.ipv4.tcp_wmem = 4096 65536 16777216

With these settings my problem is gone using the current lucid kernel
2.6.32-24.42. The system still gets a bit laggy on very high NFS network
load but it does not stall anymore.

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Writing big files to NFS target causes system lock up
https://bugs.launchpad.net/bugs/561210
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