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There was a problem with kernel interface for PMQoS some times ago.
How is state now? It is okay now.
There should be communication over Dbus between
power management - dbus - kernel - proc dirs

The /dev/cpu_dma_latency and /dev/network_latency device files are missing in el6 and fedora kernels for some reason.

The supported devices are the e1000e, ipw2100, and igbvf. I have the former installed, so I should be getting the pmqos interface files. I'm doing some more debugging now, and am waiting for test kernels to compile.

Seems to be working for me:

$ uname -a 
Linux eeepc 2.6.32.9-70.fc12.i686 #1 SMP Wed Mar 3 05:14:32 UTC 2010 i686 i686 i386 GNU/Linux
$ ls /dev | grep latency
cpu_dma_latency
network_latency

I'm half way through a test document. I should be finished in the next few days.

This issue has been proposed when we are only considering blocker
issues in the current Red Hat Enterprise Linux release.

** If you would still like this issue considered for the current
release, ask your support representative to file as a blocker on
your behalf. Otherwise ask that it be considered for the next
Red Hat Enterprise Linux release. **