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Comment: The epix10a2m requires "performance" mode for correct operation.

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All daq nodes should run the cpu frequency governor in either "ondemand" or "performance" mode.

As of this writing (May 2, 2022) the daq node daq-xpp-cam02 is not running the cpu frequency governor in "performance" mode.
It appears to be running in "ondemand" mode, which  "tries to use the slowest speed as much as possible, but quickly switches up or down when needed."

The epix10a2m requires "performance" mode for correct operation.


Code Block
languagetext
titleMay 23, 2022 email from Dan Damiani
collapsetrue
Hi,
For example in /cds/group/pcds/dist/pds/boot/daq-det-pgp01 we have the following:
for f in /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor; do
  echo "performance" > $f
done
This is set for all the machines that are running an epix10ka2m:
daq-det-pgp01
daq-mec-pgp02
daq-mfx-pgp01
daq-xcs-pgp02
daq-xpp-pgp02
Dan
Code Block
languagetext
titleXPP: WRONG scaling_governor setting on daq-xpp-dss03
collapsetrue
$ hostname
daq-xpp-cam02
$ cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
performance
$

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$ hostname
daq-xpp-dss03
$ cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor
powersave
powersave
powersave
powersave
powersave
powersave
$

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