Date: Sat, 20 Mar 2021 03:44:06 +0100 From: =?utf-8?Q?Klaus_K=C3=BCchemann?= <maciphone2@googlemail.com> To: bob prohaska <fbsd@www.zefox.net>, freebsd-arm@freebsd.org, Mark Millard <marklmi@yahoo.com> Subject: Re: RPI4 clock speeds and serial port ( temperatures idle and -j4 buildworld buildkernel ) Message-ID: <81CB0CCA-59AC-49A2-9372-4E2C22E3214D@googlemail.com> In-Reply-To: <20210320005302.GA40542@www.zefox.net> References: <20210318170053.GA26688@www.zefox.net> <9FFA0A51-C0B7-4121-95CA-B98669809007@yahoo.com> <E4CF6642-CB70-4495-A865-05469953561C@yahoo.com> <EA6BE351-98F5-4446-BA4D-948F04EDFD3B@yahoo.com> <81AC0353-258C-41C3-86B1-C133E33D97E3@yahoo.com> <20210319174359.GA38899@www.zefox.net> <FA5A110A-4E7A-4381-BBE5-9B3022CA9008@googlemail.com> <20210319195019.GA39087@www.zefox.net> <FDBC2E89-8473-4C3A-B12E-78821949FDDB@yahoo.com> <20210320005302.GA40542@www.zefox.net>
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> Am 20.03.2021 um 01:53 schrieb bob prohaska <fbsd@www.zefox.net>: >=20 > Powerd does seem to affect the apparent speed of the Pi, > and seems to make it run a bit hotter, though I've not > paid enough attention to know by how much. Trying another > buildworld/kernel to get a sense of average speed. >=20 > By any chance, was powerd enabled by default in the distant > (year or so) past? Things seemed to slow down markedly after=20 > then. I always thought it was due to changes in clang.=20 >=20 as Mark said, powerd isn=E2=80=99t enabled by default in releases , so = the freq is @600 by default. So 17 hours @4x600 . with powerd enabled you should have automatically exactly 4x1500 during = the complete compilation time. sysctl dev.cpu.0.freq will definitely show the current freq. example : using the screen tool: 1. root@generic:# sysctl dev.cpu.0.freq dev.cpu.0.freq: 600 2.: screen Now start =E2=80=9Amake -j4 xyz=E2=80=98 Ctrl-a-d to detach screen 3. root@generic:# sysctl dev.cpu.0.freq dev.cpu.0.freq: 1500 by requesting cpu-power, it is automatically scaled. I didn`t test how powerd handles manually overclocking or sdram_freq = etc.,=20 perhaps Mark has(or will) test that more . K.
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