disk and NIC io statistics via sysctl

[Stefan Parvu]

> If you write some, I will clean it up and commit it... :)

I will do that after im done with all 5 data recorders and my findings.
Would be very nice to have even better documentation. Linux is a mess.
FreeBSD is more organized and structured. 

> These should be described in their own page..  Putting detailed
> information like this is sysctl(3) is wrong... Creating a new page
> and cross-ref'ing them is best...  Most of the sysctl(3) entries are
> ones that were assigned numbers, now most sysctl's are OID_AUTO, and
> we should be using names instead... I don't see any names used in
> sysctl(3)...

ok, a new page describing all these things would be super. I will take care of
that. 

-- 
Stefan Parvu <sparvu at systemdatarecorder.org>