Performance issue with psusensor / dbus-sensors

[Peter Lundgren]

We're running into some occasional and hard to reproduce performance issues
with sensors on the entity-manager/dbus-sensors/intel-ipmi-oem software
stack. I don't have much concrete to say on the subject, but I want to put
a feeler out to see if anyone else has seen similar issues. Here's what we
think so far:

Complaints range from IPMI sensor reads being slower than normal to sensors
"never" updating.

Josh got access to one machine in a bad state and observed this:

   1. All the I2C buses were working normally. i2cdetect ran successfully
   on each bus.
   2. hwmon was working fine. He wrote a shell script to read all of the
   *_input sysfs files and could read every sensor in the system in 3 seconds.
   3. psusensor was running.
   4. busctl --no-pager monitor | grep -i PropertiesChanged shows no
   traffic. On a healthy system, it shows many updates per second. No obvious
   error messages in journalctl --no-pager -f.
   5. Restarting psusensor alleviates the problem.
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