I'm probably late to the game (grinding through the emails from last week) 
but I'm quite happy with GKrellM <http://gkrellm.srcbox.net/>

Clint

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On Fri, 26 Jun 2015, Drew Fustini wrote:

> Hello - I recently installed Scientific Linux 7 on a new PC and would
> like to have a performance monitor in the top bar of the desktop.
> Ideally, it should graph CPU, RAM, disk & net activity.  Gnome 2 used
> to have a standard panel widget for this.
>
> I am using the default Gnome 3 desktop in SL7.  There does seem to be
> a Gnome Shell extension that would meet my needs:
>
>    system-monitor by darkxst
>    https://extensions.gnome.org/extension/120/system-monitor/
>
> However, I received an error when I switched it On.  The "tweak tool"
> showed that was an exception when it attempted to start
> system-monitor.  I can post the full log but am I curious to ask the
> list:
>
> 1) Is anyone using this system-monitor Gnome Shell extension in S7?
>
> 2) Are there any alternatives to always display CPU/RAM/disk/net?
>
>
> thanks,
> drew
> https://keybase.io/pdp7
>