ghans wrote:Making the "conservative" governor behave like "ondemand" in practice is very counter-intuitive ...
Quite so. Also the lack of multiple steps flies in the face of every other machine I've used cpufreq on and is also quite counter-intuitive. Maybe this will be addressed at some point in the future.
Sleep Mode zZ wrote:
I also had a B (256MB ram) and do not remember any heat issues. It should be able to handle the heat it generates for a couple of decades - unless it is faulty in some way. How hot does your B run? Maybe put a heat sink on it?
The point about the frequency (and voltage) jumps being stressful for the PSU is interesting. I had not thought about it and do not have the expertise to say if it is a real concern. I would just let the PSU fail and get a new one when it happens.
Unless your rPi is doing something mission critical... Anyway, if this is a real problem, one solution for this would be to use your rPi with a fixed frequency. Your rPi would lose a bit of speed (or heat up a bit more - depending on the fixed frequency), but so would it also if it would use more frequency steps and/or using the conservative governor.
All later models, with the possible exception of a Pi 3, will have reduced idle power consumption. So if power consumption is the main concern, upgrading to a Zero, a A+, a B+ or even a 2 B might be worthwhile.
My rPi is well within operating specs as it sits around 48C idle, with ambient 22c. I do have multiple aluminum heatsinks on it. I was toying with adding a small fan powered off the GPIO headers, but that'd just result in more heat/stress on the linear regulator which will just exacerbate the heat/energy draw issue. Things get a bit more toasty when my 3.2" WaveShare SpotPear LCD is mounted due to reduced airflow in the case combined with increased load/draw.
Neither do I! All I can tell you is how I observe it behaving when powering my rPi versus other electronics. I can hear it whine ever so slightly and it is constantly warm to the touch when powering my rPi. I do live with electrical engineers, but I'm not sure how motivated to assist they'd be. Besides, I'm just a treehugger to them so oftentimes my questions get brushed aside.
Mission critical? Hardly. However, I think my treefrog appreciates having a sane day/night cycle in his tank now that my rPi is running the show
I can't be trusted to turn the lights on/off reliably.
Yeah, I'm thinking a Zero might be where I'm headed, especially if there ever is a Zero+ or something similar with integrated Wi-Fi/BT and the DSI header. I'd take a B++ any day of the week for what I need, though I suppose the Zero in its current configuration would mostly meet my criteria, though I'd really like to get away from the WaveShare displays and into the official Raspberry Pi Foundation touchscreen. Boggles my mind that the Zero was released without a DSI header to be compatible with the display.