On Jan 11 10:53:31, mvs@openbsd.org wrote:
> On Sun, Jan 11, 2026 at 09:45:56AM +0100, Jan Stary wrote:
> > Hi Ron,
> > 
> > I am running this on my RPI4B -
> > dmesg below, the difference being
> > 
> > 	-"firmware" at simplebus0 not configured
> > 	+rpicpu0 at simplebus0: 600-1500 MHz
> > 
> > This is what sysctl hw says:
> > 
> > hw.machine=arm64
> > hw.model=ARM Cortex-A72 r0p3
> > hw.ncpu=4
> > hw.byteorder=1234
> > hw.pagesize=4096
> > hw.disknames=sd0:a33e6029ac9d8f70
> > hw.diskcount=1
> > hw.sensors.bcmtmon0.temp0=53.07 degC
> > hw.cpuspeed=1500
> > hw.setperf=100
> > hw.vendor=raspberrypi
> > hw.product=Raspberry Pi 4 Model B Rev 1.4
> > hw.serialno=10000000690ec9eb
> > hw.uuid=31303030-3030-3030-3639-306563396500
> > hw.physmem=8441495552
> > hw.usermem=8441491456
> > hw.ncpufound=4
> > hw.allowpowerdown=1
> > hw.perfpolicy=high
> > hw.smt=0
> > hw.ncpuonline=4
> > hw.power=1
> > hw.ucomnames=
> > 
> > So with hw.setperf=100 it runs at 1500.
> > As a naive test, I recompiled the same kernel:
> > 
> > before:	34m45.95s real   108m28.41s user    19m37.55s system
> > after:	19m25.87s real    59m24.15s user    10m21.18s system
> >
> 
> Do you use 'passive' cooling? I mean without any fan. I'm curious about
> temperature.

No cooling. I log the temperature on this machine every minute;
here is the log from around when I was compiling this morning
(alreayd running on the new rpicpu kernel):

202601110900 53.07
202601110901 53.07
202601110902 53.56
202601110903 53.07
202601110904 54.04
202601110905 54.53
202601110906 53.07
202601110907 52.58
202601110908 52.58
202601110909 54.04
202601110910 52.58
202601110911 53.07
202601110912 53.07
202601110913 53.56
202601110914 54.04
202601110915 52.58
202601110916 53.07
202601110917 54.04
202601110918 53.07
202601110919 61.84
202601110920 65.73
202601110921 65.73
202601110922 61.35
202601110923 65.73
202601110924 67.19
202601110925 68.17
202601110926 68.17
202601110927 69.63
202601110928 69.14
202601110929 71.09
202601110930 69.63
202601110931 71.58
202601110932 70.60
202601110933 71.58
202601110934 71.09
202601110935 72.06
202601110936 72.06
202601110937 65.73
202601110938 58.43
202601110939 55.99
202601110940 55.02
202601110941 52.58
202601110942 52.58
202601110943 51.12
202601110944 51.61
202601110945 50.63
202601110946 51.12
202601110947 50.15
202601110948 49.17
202601110949 49.17
202601110950 49.66
202601110951 48.69
202601110952 48.20
202601110953 47.71
202601110954 48.69
202601110955 47.71
202601110956 48.20
202601110957 48.20
202601110958 48.69
202601110959 47.23
202601111000 48.20

Below is a more detailed log from another such compilation (now)
logging hw.sensors.bcmtmon0.temp0 every five seconds, starting
just before make -j4 and ending after it starts cooling down.
(To be clear, this is with apm -A).

	Jan


48.20
48.69
53.07
55.02
54.53
55.99
55.50
57.45
58.43
57.45
58.43
59.40
59.40
60.86
60.86
61.84
60.86
60.37
62.81
61.35
61.35
62.81
62.81
62.32
63.30
61.84
62.32
62.81
63.78
64.27
63.30
62.81
64.27
63.78
64.76
64.27
63.78
64.76
64.27
64.27
64.27
65.73
65.24
64.76
66.70
66.22
65.73
66.70
67.19
65.73
66.70
67.19
67.19
66.70
67.19
67.19
67.19
67.68
66.70
67.19
67.68
66.70
67.19
67.68
68.17
68.17
67.19
67.19
67.19
68.17
68.17
69.14
68.17
68.17
68.17
69.63
68.17
68.65
68.65
69.14
68.17
68.17
68.17
69.63
68.65
69.14
70.60
69.63
70.11
69.63
69.14
70.60
71.09
70.60
69.14
70.11
70.11
70.11
69.14
70.11
70.11
69.63
70.11
70.11
70.11
70.11
71.09
70.11
70.60
70.60
70.60
70.11
70.11
69.63
70.11
70.11
71.58
71.09
70.60
71.58
71.09
70.11
70.60
70.60
69.63
70.11
71.58
70.60
71.58
71.09
71.09
71.58
72.06
72.06
71.58
72.06
71.09
72.55
72.06
72.55
71.58
71.58
72.06
72.55
71.58
71.58
71.58
71.09
73.04
72.55
72.06
72.06
72.06
73.52
72.06
71.58
71.09
71.58
72.06
72.06
71.09
72.06
71.58
73.04
72.06
71.58
71.58
72.06
71.09
72.06
71.58
72.06
72.55
71.09
71.58
71.58
72.55
72.06
72.06
71.09
70.60
72.55
72.06
72.55
71.58
71.09
71.58
72.55
72.06
70.60
71.58
72.06
71.58
71.58
71.09
72.55
72.55
72.06
71.09
71.09
71.58
72.06
72.55
72.06
72.06
72.06
72.06
71.58
72.55
69.63
66.70
66.70
65.24
67.19
66.70
67.19
66.22
65.24
62.81
62.81
62.32
62.81
61.84
60.86
60.86
59.89
59.40
58.43
58.43
58.43
58.43
58.43
56.97
56.97
56.97
57.45
55.99
55.99
56.97
56.48
55.99
55.99
55.50
55.99
55.50
55.99
55.50
56.97
55.02
55.50
55.02
55.02
53.07
54.53
54.04
54.04
54.04
53.07