Date: Thu, 18 Mar 2021 13:50:02 -0700 From: Mark Millard <marklmi@yahoo.com> To: bob prohaska <fbsd@www.zefox.net> Cc: freebsd-arm <freebsd-arm@freebsd.org>, tech-lists <tech-lists@zyxst.net> Subject: Re: RPI4 clock speeds and serial port ( temperatures idle and -j4 buildworld buildkernel ) Message-ID: <EA6BE351-98F5-4446-BA4D-948F04EDFD3B@yahoo.com> In-Reply-To: <E4CF6642-CB70-4495-A865-05469953561C@yahoo.com> References: <20210318170053.GA26688@www.zefox.net> <9FFA0A51-C0B7-4121-95CA-B98669809007@yahoo.com> <E4CF6642-CB70-4495-A865-05469953561C@yahoo.com>
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On 2021-Mar-18, at 13:01, Mark Millard <marklmi at yahoo.com> wrote: > On 2021-Mar-18, at 12:05, Mark Millard <marklmi@yahoo.com> wrote: >=20 >> . . . >=20 > I've not done temperate testing in a > while. One quick report I can make > is that for my "always cpu_freq 2000 > always sdram_freq 3200" contexts > with the RPI4B only doing whatever > background tasks are involved in > being basically idle but having > the heatsinks and active cooling > (fans): >=20 > # sysctl -a | grep temper > hw.cpufreq.temperature: 35012 > dev.cpu.0.temperature: 35.0C >=20 > in a currently 15.5C or so ambient > context is rather typical. >=20 So I started up a from-scratch "rebuild self" -j buildworld buildkernel via an ssh over Ethernet session. (This may minimize interrupt overhead vs. the output text scrolling the serial console?) 30+ minutes into the build: I'm seeing figures like (the high so far): hw.cpufreq.temperature: 49137 dev.cpu.0.temperature: 49.1C (Such pairs give some idea of the fairly short term variability.) I'm only bothering to look once a minute or so: # while (true); do sleep 60 ; sysctl hw.cpufreq.temperature = dev.cpu.0.temperature ; done So far the widest fairly-short-term variation was in: hw.cpufreq.temperature: 45727 dev.cpu.0.temperature: 45.6C FYI: The build reported: make[1]: "/usr/fbsd/mm-src/Makefile.inc1" line 339: SYSTEM_COMPILER: = Determined that CC=3Dcc matches the source tree. Not bootstrapping a = cross-compiler. make[1]: "/usr/fbsd/mm-src/Makefile.inc1" line 344: SYSTEM_LINKER: = Determined that LD=3Dld matches the source tree. Not bootstrapping a = cross-linker. Later I'll report the maximum(s) observed. But it will be a few hours for the build to complete. =3D=3D=3D Mark Millard marklmi at yahoo.com ( dsl-only.net went away in early 2018-Mar)
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