recent FreeBSD 13.0-CURRENT has fans screaming again on PowerMac quad
Michael Tuexen
tuexen at freebsd.org
Fri Jun 19 15:22:19 UTC 2020
> On 19. Jun 2020, at 16:34, Justin Hibbits <chmeeedalf at gmail.com> wrote:
>
> On Fri, 19 Jun 2020 15:55:30 +0200
> Michael Tuexen <tuexen at freebsd.org> wrote:
>
>>> On 19. Jun 2020, at 14:22, Dennis Clarke via freebsd-ppc
>>> <freebsd-ppc at freebsd.org> wrote:
>>>
>>>
>>> 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.
>> Disable SMP?
>>
>> Best regards
>> Michael
>>>
>>> --
>>> Dennis Clarke
>>> RISC-V/SPARC/PPC/ARM/CISC
>>> UNIX and Linux spoken
>>> GreyBeard and suspenders optional
>>> _______________________________________________
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>>
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>
> If it's SMP timebase sync related, the problem actually looks
> relatively easy to solve, at least for G4 and PowerMac11,2 G5's
> (PowerMac7,3 looks trickier), from examining the Linux source and the
> OFW device tree. The PowerMac11,2 (which the Quad is), and the G4s,
> use a GPIO to disable and enable the timebase, so a very similar thing
> can be done with the powermac platform driver as is done with the
> mpc85xx platform driver, which effectively is:
>
> All CPUs rendezvous in the smp_timebase_sync() function
> BSP disables timebase, sets the timebase sync to non-zero
> APs check for non-zero timebase, set their timebases to it
> All CPUs rendezvous at the end
> BSP re-enables timebase, and unleashes CPUs
>
> A couple hours of work for someone with the hardware, I'd say. I can
> probably provide a patch to be tested by someone in the next few days,
> if someone else doesn't get around to it first.
I would be happy to test. Need to check what kind of PowerMac I have in my lab...
Best regards
Michael
>
> - Justin
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