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Fri, 19 Mar 2021 18:29:52 +0000 Received: by kubenode579.mail-prod1.omega.gq1.yahoo.com (VZM Hermes SMTP Server) with ESMTPA ID 5330bcb3343fe8667e9aab4877748360; Fri, 19 Mar 2021 18:29:52 +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: <9DB699E3-5977-4651-B3D2-26343F202F2D@yahoo.com> Date: Fri, 19 Mar 2021 11:29:51 -0700 Cc: freebsd-arm Content-Transfer-Encoding: quoted-printable Message-Id: References: <20210318170053.GA26688@www.zefox.net> <9FFA0A51-C0B7-4121-95CA-B98669809007@yahoo.com> <81AC0353-258C-41C3-86B1-C133E33D97E3@yahoo.com> <20210319174359.GA38899@www.zefox.net> <9DB699E3-5977-4651-B3D2-26343F202F2D@yahoo.com> To: bob prohaska X-Mailer: Apple Mail (2.3654.60.0.2.21) X-Rspamd-Queue-Id: 4F2C9Z69Zrz3Qvr 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:+]; RCPT_COUNT_TWO(0.00)[2]; 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)[98.137.69.147: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)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; MIME_GOOD(-0.10)[text/plain]; SPAMHAUS_ZRD(0.00)[98.137.69.147:from:127.0.2.255]; TO_MATCH_ENVRCPT_SOME(0.00)[]; RCVD_IN_DNSWL_NONE(0.00)[98.137.69.147:from]; RWL_MAILSPIKE_POSSIBLE(0.00)[98.137.69.147: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 18:29:55 -0000 On 2021-Mar-19, at 11:13, Mark Millard wrote: >=20 > On 2021-Mar-19, at 10:43, bob prohaska wrote: >=20 >> On Thu, Mar 18, 2021 at 10:14:26PM -0700, Mark Millard wrote: >>>=20 >>> 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 >>>=20 >>> So somewhat under 9 hours. >>>=20 >>=20 >> So my figures (~17 hours) seem reasonable for a default clocking. >> I thought maybe I'd done something wrong. >>=20 >> For now I'll leave the clocking alone. But some puzzles remain: >> It appears that the CPU and the GPU have separate clocks. Can they >> be set separately, and does the GPU have any practical effect on >> FreeBSD's behavior once boot is complete?=20 >=20 > See: >=20 > = https://www.raspberrypi.org/documentation/configuration/config-txt/overclo= cking.md >=20 > It says that setting gpu_freq sets core_freq and also says: >=20 > QUOTE > Changing core_freq in config.txt is not supported on the Pi 4 > any change from the default will almost certainly cause a > failure to boot. > END QUOTE >=20 > and: >=20 > QUOTE > It is recommended when overclocking to use the individual > frequency settings (isp_freq, v3d_freq etc) rather than gpu_freq, > as since it attempts to set core_freq (which cannot be changed on] > the Pi 4), it is not likely to have the desired effect. > END QUOTE >=20 > There is more about the relationships to hdmi_enable_4kp60 and > enable_tvout. Back to temperature. See: = https://www.raspberrypi.org/documentation/hardware/raspberrypi/frequency-m= anagement.md It indicates that 85C is the maximum temperature, though lower figures can be set. It also reports that a form of throttling starts at 80C by default. The RPi3B+ also has a soft limit that changes the 1.4GHz to 1.2 Ghz and the operating voltage is slightly reduced: configurable temp_soft_limit but by default 60C. For the RPi4B, "there is currently no soft limit defined". =3D=3D=3D Mark Millard marklmi at yahoo.com ( dsl-only.net went away in early 2018-Mar)