i have this too. not heavy network usage yet, machine's barely in production. 
it's an ec2 instance though, with a basic LAMP stack installed. doesn't appear 
to have affected stability yet either, but getting a lot of
Jun 21 13:20:35 ip-10-227-177-177 kernel: [1376611.883375] swapper: page 
allocation failure. order:5, mode:0x20
Jun 21 13:20:35 ip-10-227-177-177 kernel: [1376611.883379] Pid: 0, comm: 
swapper Not tainted 2.6.32-308-ec2 #16-Ubuntu
Jun 21 13:20:35 ip-10-227-177-177 kernel: [1376611.883381] Call Trace:
etc etc..
in /var/log/messages.

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https://bugs.launchpad.net/bugs/648721

Title:
  page allocation failure on machines under heavy network load

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