recent FreeBSD 13.0-CURRENT has fans screaming again on PowerMac quad

[Dennis Clarke]

Dear ppc64 big endian types:

Sort of the same problem we had before. Except now the screaming fans
seem to mysteriously die down for about thirty seconds before they start
up again and run full blast for five minutes. It makes the machine a
nasty blower fan thing to put down the hallway and run a 30 meter CAT6
ethernet to it just to deal with it at all.

Anyone else seeing this ?  It is really quite horrible to listen to.

At the moment there is nothing running at all with the exception of a
svnlite checkout of http://svn.freebsd.org/base/head and the machine is
screaming as if its life may end at any moment. Thankfully I have spare
parts for when these fans blow up :


dclarke at enceladus:~ $ uptime
12:21PM  up 33 mins, 2 users, load averages: 0.97, 0.84, 0.48

dclarke at enceladus:~ $ uname -apKU
FreeBSD enceladus 13.0-CURRENT FreeBSD 13.0-CURRENT #0 r362037: Thu Jun 
11 06:09:20 UTC 2020 
root at releng1.nyi.freebsd.org:/usr/obj/usr/src/powerpc.powerpc64/sys/GENERIC64 
  powerpc powerpc64 1300097 1300097

dclarke at enceladus:~ $ cat /etc/rc.conf
clear_tmp_enable="YES"
syslogd_flags="-ss"
hostname="enceladus"
ifconfig_bge0="inet 172.16.35.8 netmask 255.255.255.192"
defaultrouter="172.16.35.1"
sshd_enable="YES"
ntpd_enable="YES"
# Set dumpdev to "AUTO" to enable crash dumps, "NO" to disable
dumpdev="AUTO"
powerd_enable="YES"
dclarke at enceladus:~ $
dclarke at enceladus:~ $

top -CSP shows :

last pid:  1113;  load averages:  1.00,  0.70,  0.35 
                                     up 0+00:29:42  12:17:57
55 processes:  3 running, 51 sleeping, 1 waiting
CPU 0:  8.6% user,  0.0% nice, 44.7% system,  0.3% interrupt, 46.3% idle
CPU 1:  0.3% user,  0.0% nice,  2.8% system,  0.6% interrupt, 96.4% idle
CPU 2:  0.0% user,  0.0% nice,  0.0% system,  0.0% interrupt,  0.0% idle
CPU 3:  0.0% user,  0.0% nice,  0.0% system,  0.0% interrupt,  0.0% idle
Mem: 28M Active, 696M Inact, 626M Wired, 344M Buf, 6406M Free
Swap: 3615M Total, 3615M Free

   PID USERNAME    THR PRI NICE   SIZE    RES STATE    C   TIME     CPU 
COMMAND
    11 root          4 155 ki31     0B   192K RUN      0 112:42 307.44% idle
  1104 root          1 103    0    32M    19M CPU3     3   4:57  87.60% 
svnlite
    12 root         22 -52    -     0B  1056K WAIT     1   0:12   2.65% intr
     7 root          2 -16    -     0B    96K -        0   0:04   1.17% cam
    19 root          6  20    -     0B   288K psleep   2   0:02   0.50% 
bufdaemon
  1050 dclarke       1  20    0    23M  5252K select   0   0:01   0.23% sshd
  1113 dclarke       1  20    0    16M  4408K CPU0     0   0:00   0.01% top
   931 root          1  20    0    23M  4676K select   2   0:00   0.01% ntpd
  1109 dclarke       1  20    0    23M  5260K select   2   0:00   0.00% sshd
    15 root         15 -68    -     0B   720K -        0   0:00   0.00% usb
   971 root          1  20    0    19M  5696K select   3   0:00   0.00% 
sendmail
   761 root          1  20    0    14M  2384K select   2   0:00   0.00% 
syslogd
     0 root         21 -16    -     0B  1008K swapin   3   0:00   0.00% 
kernel
  1062 root          1  20    0    15M  4944K pause    2   0:00   0.00% csh
  1107 root          1  20    0    23M    11M select   1   0:00   0.00% sshd
  1048 root          1  39    0    23M    11M select   2   0:00   0.00% sshd
   940 root          1  20    0    14M  1260K select   3   0:00   0.00% 
powerd
  1057 dclarke       1  20    0    15M  3848K wait     1   0:00   0.00% su
  1058 dante         1  20    0    15M  3988K wait     3   0:00   0.00% sh
  1051 dclarke       1  20    0    15M  3988K wait     3   0:00   0.00% sh
     1 root          1  20    0    13M  1228K wait     3   0:00   0.00% init
  1061 dante         1  20    0    15M  3848K wait     1   0:00   0.00% su
    13 root          3  -8    -     0B   144K -        3   0:00   0.00% geom
   978 root          1  20    0    14M  2400K nanslp   3   0:00   0.00% cron
  1110 dclarke       1  20    0    15M  4028K wait     1   0:00   0.00% sh
    23 root          1 -16    -     0B    48K pmac_t   3   0:00   0.00% 
pmac_thermal
  1037 root          1  52    0    14M  2808K ttyin    2   0:00   0.00% 
getty
  1035 root          1  52    0    14M  2808K ttyin    0   0:00   0.00% 
getty
  1033 root          1  52    0    14M  2808K ttyin    1   0:00   0.00% 
getty
  1032 root          1  52    0    14M  2808K ttyin    3   0:00   0.00% 
getty
   968 root          1  20    0    22M  4108K select   2   0:00   0.00% sshd
  1036 root          1  52    0    14M  2808K ttyin    3   0:00   0.00% 
getty

There must be a trivial fix to all this as we had it all working pretty
darn well some few months ago.

-- 
Dennis Clarke
RISC-V/SPARC/PPC/ARM/CISC
UNIX and Linux spoken
GreyBeard and suspenders optional