Public bug reported:

Binary package hint: gnome-system-monitor

Hi! This report is about System Monitor 2.18.1.1, running on Ubuntu
Feisty. It would be a nice fix for Gutsy.

Currently the CPU History graph in the System Monitor is a nice tool for
a quick estimate of the current CPU usage, but only for a very rough
estimate. The main problem is that the units are not very clear: the
time axis is not marked at all, so I can at most estimate how long a
spike took; the height is marked in percent -- but doesn't mention
exactly of what.

I'm using Ubuntu on a Centrino Duo laptop, which can change the
frequency of each processor according to several factors. (I'm not sure
if it can scale each core separately, though. The factors I know are
load and whether or not I'm plugged in, there may be some other
heuristics.)

All this means that xy % processor usage can mean very different things
in terms of how much work the computer is doing. At the very least, the
legend below the graph -- [color] CPU#: ##.# % -- should be changed to
something like [color] CPU#: ##.# % usage (at ## GHz) -- though this
doesn't fix the graph. Maybe a different line (different shade or
dotted) could indicate the frequency of the processor.

** Affects: gnome-system-monitor (Ubuntu)
     Importance: Undecided
         Status: Unconfirmed

-- 
the "CPU History" graph info is unclear
https://bugs.launchpad.net/bugs/109356
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