kswapd0 consuming 50% of cpu

[Bruno Wolff III]

On Mon, Nov 26, 2012 at 00:20:02 -0700,
   JD <jd1008 at gmail.com> wrote:
>Is this normal for the kswapd to consume 50% of cpu?
>And why would it do that?
>This is the first time I have seen this.
>Kernel is kernel-3.6.6-1.fc16
>
>   24 root      20   0     0    0    0 R 50.1  0.0 117:08.40 kswapd0

There have been problems with kswapd in 3.7 kernels, though I haven't 
seen it on 3.6 kernels.

https://bugzilla.redhat.com/show_bug.cgi?id=866988 is tracking the issue 
for 3.7 kernels. Maybe what you are seeing is related.