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Fri, 19 Mar 2021 05:14:33 +0000 Received: by smtp420.mail.bf1.yahoo.com (VZM Hermes SMTP Server) with ESMTPA ID 9220db35b2546e2d62d121e411d89292; Fri, 19 Mar 2021 05:14:29 +0000 (UTC) Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 14.0 \(3654.60.0.2.21\)) Subject: Re: RPI4 clock speeds and serial port ( temperatures idle and -j4 buildworld buildkernel ) From: Mark Millard In-Reply-To: Date: Thu, 18 Mar 2021 22:14:26 -0700 Cc: freebsd-arm , tech-lists Content-Transfer-Encoding: quoted-printable Message-Id: <81AC0353-258C-41C3-86B1-C133E33D97E3@yahoo.com> References: <20210318170053.GA26688@www.zefox.net> <9FFA0A51-C0B7-4121-95CA-B98669809007@yahoo.com> To: bob prohaska X-Mailer: Apple Mail (2.3654.60.0.2.21) X-Rspamd-Queue-Id: 4F1sWv4Mmqz3krc X-Spamd-Bar: --- X-Spamd-Result: default: False [-3.50 / 15.00]; FREEMAIL_FROM(0.00)[yahoo.com]; MV_CASE(0.50)[]; R_SPF_ALLOW(-0.20)[+ptr:yahoo.com]; TO_DN_ALL(0.00)[]; DKIM_TRACE(0.00)[yahoo.com:+]; DMARC_POLICY_ALLOW(-0.50)[yahoo.com,reject]; NEURAL_HAM_SHORT(-1.00)[-1.000]; FROM_EQ_ENVFROM(0.00)[]; RCVD_TLS_LAST(0.00)[]; MIME_TRACE(0.00)[0:+]; FREEMAIL_ENVFROM(0.00)[yahoo.com]; ASN(0.00)[asn:36647, ipnet:98.137.64.0/20, country:US]; RBL_DBL_DONT_QUERY_IPS(0.00)[98.137.65.32:from]; DWL_DNSWL_NONE(0.00)[yahoo.com:dkim]; MID_RHS_MATCH_FROM(0.00)[]; ARC_NA(0.00)[]; R_DKIM_ALLOW(-0.20)[yahoo.com:s=s2048]; NEURAL_HAM_MEDIUM(-1.00)[-1.000]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_THREE(0.00)[3]; NEURAL_HAM_LONG(-1.00)[-1.000]; MIME_GOOD(-0.10)[text/plain]; SPAMHAUS_ZRD(0.00)[98.137.65.32:from:127.0.2.255]; TO_MATCH_ENVRCPT_SOME(0.00)[]; RCVD_IN_DNSWL_NONE(0.00)[98.137.65.32:from]; RWL_MAILSPIKE_POSSIBLE(0.00)[98.137.65.32:from]; RCVD_COUNT_TWO(0.00)[2]; MAILMAN_DEST(0.00)[freebsd-arm] X-BeenThere: freebsd-arm@freebsd.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Porting FreeBSD to ARM processors List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 19 Mar 2021 05:14:36 -0000 On 2021-Mar-18, at 13:50, Mark Millard wrote: > On 2021-Mar-18, at 13:01, Mark Millard wrote: >=20 > On 2021-Mar-18, at 12:05, Mark Millard 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 >=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?) >=20 > 30+ minutes into the build: >=20 > I'm seeing figures like (the high so far): >=20 > hw.cpufreq.temperature: 49137 > dev.cpu.0.temperature: 49.1C >=20 > (Such pairs give some idea of the > fairly short term variability.) >=20 > I'm only bothering to look once > a minute or so: >=20 > # while (true); do sleep 60 ; sysctl hw.cpufreq.temperature = dev.cpu.0.temperature ; done >=20 > So far the widest fairly-short-term variation > was in: >=20 > hw.cpufreq.temperature: 45727 > dev.cpu.0.temperature: 45.6C >=20 >=20 > FYI: The build reported: >=20 > 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. >=20 >=20 > Later I'll report the maximum(s) observed. But it will > be a few hours for the build to complete. >=20 Looking at the -j4 buildworld buildkernel output I see a few of examples of making it into the 50s. The highest being: hw.cpufreq.temperature: 52059 dev.cpu.0.temperature: 52.0C Ignoring the start-warmup/end-cooldown: a few under 46.0C So unlikely that there was any throttling. FYI: World build completed on Thu Mar 18 21:31:44 PDT 2021 World built in 29705 seconds, ncpu: 4, make -j4 . . . Kernel build for GENERIC-NODBG completed on Thu Mar 18 22:10:02 PDT 2021 Kernel(s) GENERIC-NODBG built in 2298 seconds, ncpu: 4, make -j4 So somewhat under 9 hours. Note: I've never checked how much of a difference using a microsd card instead of the USB3 SSD makes for such a temperature test. =3D=3D=3D Mark Millard marklmi at yahoo.com ( dsl-only.net went away in early 2018-Mar)