Description of problem:

Network devices can have arbitrary names, and due to
http://fedoraproject.org/wiki/Features/ConsistentNetworkDeviceNaming, will have
different names in Fedora 15.

tuned-0.2.19/monitorplugins/net.py:
...
                devs = open("/proc/net/dev").readlines()
                for l in devs:
                        l = l.replace(":", " ")
                        v = l.split()
                        d = v[0]
                        if not d.startswith("eth"):
                                continue
...

Version-Release number of selected component (if applicable):

tuned-0.2.19

How reproducible:

By visual inspection.