[Bug 1067] linux pmda does too much work for network.interface queries

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Comment # 12 on bug 1067 from Carlos L. Torres

Created attachment 331 [details]
strace output with patch

Now it is working and is not segfaulting any more. But in terms of performance,
there was no improvement.

Attached you'll find the strace output with the new patch, and the request for
these metrics network.interface.in.bytes, network.interface.out.bytes,
network.interface.in.packets, network.interface.out.packets. 

The total request/response took over 4 seconds. There are some instances where
ioctl(8, SIOCETHTOOL, 0x...) syscalls are taking a little over 1 second.

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