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On 16/04/2024 17:36, Pancho wrote:
> On 16/04/2024 10:59, Theo wrote:
>> The Natural Philosopher <
tnp@invalid.invalid> wrote:
>>>> The Pi 4B will definitely throttle with only a ventilated case if it is
>>>> anything other than sitting idle all the time.
>>>>
>>> I am not interested in proof by assertion
>>> I had mine up to 130% on `top` and it never made more than 76┬░C
>>
>> You do know that `top` won`t show throttling?┬а Throttling means the
>> CPU is
>> clocked lower than the maximum frequency to reduce heat generation - top
>> will still show `100%` of CPU (for one core) but that will be 100% of a
>> lower clock speed.
>>
>> cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq
>>
>> shows you the current clock of CPU core 0 and:
>>
>> sudo vcgencmd get_throttled
>>
>> will tell you the throttling status:
>>
>>
>> #### get_throttled
>>
>> Returns the throttled state of the system. This is a bit pattern.
>>
>> | Bit | Meaning |
>> |:---:|---------|
>> | 0 | Under-voltage detected |
>> | 1 | Arm frequency capped |
>> | 2 | Currently throttled |
>> | 3 | Soft temperature limit active |
>> | 16 | Under-voltage has occurred |
>> | 17 | Arm frequency capped has occurred |
>> | 18 | Throttling has occurred |
>> | 19 | Soft temperature limit has occurred
>>
>>
>> For example if I run `stress -c 4` then get_throttled gives me:
>> throttled=0xe0008
>>
>> so the temperature limit is in operation and throttling has occurred
>> in the
>> past.┬а (this Pi4 has cooling, I can`t remember but I think there`s a
>> heatsink and fan in there)
>>
>> $ sudo vcgencmd measure_temp
>> temp=84.7`C
>>
>> so it`s up near its thermal limit.
>>
>>>> I don`t see the point of letting it throttling when an inexpensive fan
>>>> will keep it at full speed under any load.
>>>>
>>> I question that it will in fact throttle.
>>>
>>> Like so much `everybody knows`┬а when you look at it it is in fact
>>> `everyone believes because people selling fans told them so.
>>
>> `Everybody knows` because they have evidence, not assertions.
>>
>>> The whole point of ARM is its lower power and lack of need for forced
>>> cooling
>>
>> Everyone`s been thermally limited for maybe 15 years, it`s just that Arm
>> cores have traditionally targeted a lower thermal envelope in devices
>> where
>> forced air cooling isn`t an option.┬а The way this works is that CPUs work
>> until they hit their thermal envelope and then throttle.┬а No popular
>> application processor for maybe a couple of decades has been able to
>> power
>> all the silicon at once to max performance and stay within the thermal
>> budget.
>>
>
> I think this thread is lacking precise, clear language, and people are
> making false comparisons. Talking about ventilated cases is confusing, I
> don`t know what a thermal budget is.
>
> There are four┬а points:
>
> 1) Passive cases, where the case is a heat sink,┬а are enough to keep a
> rPi4 below throttle temperatures, under any load, assuming ambient less
> than 35C.
>
> 2) With no heatsink at all the rPi4 will throttle under compute
> intensive workloads.
>
> 3) The rPi4 can perform useful day-to-day tasks without any heatsync,
> passive or forced, without throttling. I ran Motioneye, cctv, on mine
> for a couple of years before buying a case.
>
> 4) Most of us don`t use the rPi4 for continuous compute intensive tasks.
>
> There, that should make everyone happy :-)
>
>
Mine runs hot because there is a TV hat bolted on top. And a SSD drive
bolted underneath
that pushes up the case internals way more than the Pi does
But it is still happy and unthrottled
--
"Corbyn talks about equality, justice, opportunity, health care, peace,
community, compassion, investment, security, housing...."
"What kind of person is not interested in those things?"
"Jeremy Corbyn?"
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