FreeBSD 11-CURRENT on Raspberry Pi 512MB

[Rui Paulo]

On Oct 31, 2014, at 12:32, Daisuke Aoyama <aoyama at peach.ne.jp> wrote:
> 
>> That patch has a lot of unrelated changes.  Could you produce a patch with svn that is just related to cpufreq and its mbox changes?
> 
> I have uploaded as:
> http://www.peach.ne.jp/archives/rpi/patch/cpufreq-20141101.tar.gz
> 
> Please use this archive.
> 
> CHANGES:
> modify for style(9) and 80 columns
> remove multiple cast
> remove bootverbose of error case
> remove unused code and g_XXXX variables
> fix wrong message/comments.
> add DPRINTF and dump into #ifdef DEBUG
> add tunable int for verbose and lowest_freq
> suppress default boot log

Thanks, I've updated the review page:

	https://reviews.freebsd.org/D1025

I'm going to review it again during the weekend.


> default boot:
> 
> bcm2835_cpufreq0: ARM 700MHz, Core 250MHz, SDRAM 398MHz, Turbo OFF
> 
> verbose boot or hw.bcm2835.cpufreq.verbose=1 by loader.conf:
> 
> bcm2835_cpufreq0: Boot settings:
> bcm2835_cpufreq0: current ARM 700MHz, Core 250MHz, SDRAM 398MHz, Turbo OFF
> bcm2835_cpufreq0: max/min ARM 1000/700MHz, Core 500/250MHz, SDRAM 500/400MHz
> bcm2835_cpufreq0: current Core 1200mV, SDRAM_C 1200mV, SDRAM_I 1200mV, SDRAM_P 1200mV
> bcm2835_cpufreq0: max/min Core 1350/1200mV, SDRAM_C 1225/1200mV, SDRAM_I 1225/1200mV, SDRAM_P 1225/1200mV

Cool!

> default (max=1000MHz):
> dev.cpu.0.freq_levels: 1000/-1 900/-1 800/-1 700/-1 600/-1 500/-1 400/-1 300/-1
> 
> hw.bcm2835.cpufreq.lowest_freq=500 by loader.conf (max=1000MHz):
> dev.cpu.0.freq_levels: 1000/-1 900/-1 800/-1 700/-1 600/-1 500/-1
> 
> 
>> - Did you measure the power consumption when using the different frequency values?
> 
> I have tried to get an ampere on USB power cable both idle and running ports/benchmarks/unixbench.
> Following table is the result. It's not so different on CPU idle.
> 
> Power=5.10V
> V=0/0  300MHz idle/0.35A 1.79W 3%DOWN unixbench/0.39A 50.8C 1.99W 9%DOWN
> V=0/0  700MHz idle/0.36A 1.84W ------ unixbench/0.43A 54.6C 2.19W ------
> V=6/1 1000MHz idle/0.40A 2.04W 10%UP  unixbench/0.51A 58.3C 2.60W 19%UP
> 
> Note:
> V=0/0 mean default voltage(1.2V/1.2V)
> V=6/1 mean over_voltage=6/over_voltage_sdram=1(1.35V/1.225V)
> All manual setting without powered
> Temperature is checked running only

That's interesting.  Thanks for taking the time to measure it.

Regards,
--
Rui Paulo