Reproduced multiple times on 10.04

On 10.04 this is also happening to us with a vm.min_free_kbytes set to
11140:

# sysctl vm.min_free_kbytes
vm.min_free_kbytes = 11140

Running multiple (10+) 10.04 instances on EC2, and reproduced over 15
times, but most often resulting in hung/non-responsive servers rather
than a recovery.

It's fairly easy to reproduce this by increasing the MTU=9000 instead of
default 1500, and moving large files, at which point it will hang the
system or crash the system.

I'm now increasing that to 32252 to see how we fare at that point.

Would love to use jumbo frames as well, but causes crash within a few
days (when we get high NFS load = network load)

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https://bugs.launchpad.net/bugs/591947

Title:
  Copying large files to NFS mount blocks system

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