How good/useful/dangerous is it to under clock RB4011 (down to 533MHz).
I use RB4011 mainly for the 10 x Geth + 5Ghz 4x4 Wifi it offers, but don’t need all the CPU horse power it offers.
Now I saw the clock speed selection under ROUTERBOARD and started to reduce clock speed down to 533Mhz, hoping to safe also some power.
Two question arise:
- CPU load still shows same numbers as before, I wonder if load is measured relative to the full (normal) clock speed or relative to available MIPS (533M)?
- Any feedback / experience when using very low CPU frequency…? In theory you should only see worst case CPU being 100% if loaded, but you never know if there
are side effects…
Any feedback/knowledge out there?
Last but not least, anyone doing scripting based CPU frequency scaling???
Hey
cpu frequency settings requires a reboot to become active (part of boot configuration), so use of script would be limited.
Impact-wise, functionally it should do exactly same thing, but slower… Anything running on cpu will be impacted: routing, queuing, firewall, …
Hardware based switching / bridging (within a single chip) should be fine as running on the switch itself.
It will run cooler, but don’t expect much power reduction, as it’s already a low power device.
Sebastia,
thanks for your feedback.
On RB4011 you can change clock frequency without reboot (when reading CPU info, it shows the new set frequency even without reboot).
and the message: “WARNING: cpu not running at default speed”
I don’t feel RB4011 is “low power”, but I will try to do some power measurements when I have time to do so to see what is makes.
busted 
, I don’t own a 4011… Good to know, thx
I meant low-power, based on actual usage: “Max power consumption 44 W”
that’s not a lot