powerd broken

[Dominic Fandrey]

Alexander Motin wrote:
> Dominic Fandrey wrote:
>> Alexander Motin wrote:
>>> It means that one of your CPUs spent most of it's time in interrupt
>>> processing and so far from idle. What does `top -P` shows you? Where
>>> have you seen that ~6% CPU load?
>>
>> That is the load shown by the e17 CPU module. It's display has always
>> been in sync with top in the past, no longer though, it appears.
>>
>> # top -PIS
>> last pid: 68235;  load averages:  0.09,  0.16, 
>> 0.17                                                                                                                               
>> up 0+05:17:29  13:05:10
>> 137 processes: 4 running, 117 sleeping, 16 waiting
>> CPU 0:  1.1% user,  0.0% nice,  1.1% system, 61.4% interrupt, 36.3% idle
>> CPU 1:  9.0% user,  0.0% nice,  3.4% system,  0.0% interrupt, 87.6% idle
>> Mem: 419M Active, 415M Inact, 416M Wired, 3752K Cache, 183M Buf, 716M
>> Free
>> Swap: 4096M Total, 4096M Free
>>
>>   PID USERNAME    THR PRI NICE   SIZE    RES STATE  C   TIME   WCPU
>> COMMAND
>>    11 root          1 171 ki31     0K    16K RUN    1 286:42 93.46%
>> idle: cpu1
>>    23 root          1 -80    -     0K    16K RUN    0 126:54 59.96%
>> irq16: hdac0 uhci+
>>    12 root          1 171 ki31     0K    16K RUN    0 179:27 40.09%
>> idle: cpu0
>>  1318 root          1  46    0   439M   312M select 1  12:55  1.76% Xorg
>>  4361 musicpd       4  44    0 91164K 14412K ucond  1   1:57  0.78% mpd
>>
>> Some things strike me as odd. The difference between the load reported
>> by powerd and top is still very significant and of course the high
>> interrupt load.
> 
> powerd now reports/uses summary load of all CPUs (it can be bigger then
> 100%), while top shows average.
> 
>> I've got a mouse with a 1khz report rate (the only connected USB
>> device), but unplugging it doesn't change the load. Neither does
>> stopping moused (I'm running the system without HAL). There also
>> is a fingerprint reader, but it is only detected by ugen.
> 
> I would start from identifying all devices sharing that IRQ and trying
> to disable them (or unload their drivers) one by one. `systat -vm 1`
> will show you how much interrupts actually happens there per second.
> 
> On most of modern systems you can make hdac0 to not share that IRQ by
> enabling MSI there with hint.hdac.0.msi=1 in loader.conf.
> 

I already did unplug all devices to no avail. Afterwards I tried
to 'kldunload -f' all usb devices, but most refused. However during
this I recognized that /boot/modules holds an old u3g.ko, back from
the time when it was not in stable. Apparently modules in
/boot/modules have preference over those in /boot/kernels. I deleted
the old u3g.ko and rebooted (because I couldn't get the system to
unload it). Now everything is fine, the interrupt load is gone.

I'll monitor this and come back here if it turns out this has just
been coincidence.

Thank you for all that help.

Regards