python 3.6 causes high cpu usage on idle

[francescocariati]

Hi,
I'm a FreeNAS user since 2011, on various machines.

I'm experiencing an high load average on a freshly installed 11.1-U4
on an HPE MicroServer Gen 10, Opteron X3216 dual core, 8 GB RAM ECC (I know it's low, I'm still waiting for the extra sticks to arrive)
UEFI Boot is from a Kingston SSD, storage is on 2 x 2TB WD SATA, RAID 1.
I was not experiencing any similar issue when running on 9.10.x

Despite the fact that the machine has zero traffic (and therefore zero disk activity) coming from the users, you can see that the load average is quite high and has a lot of spikes:

The culprit seems to be a bunch of python processes

While middlewared is always active, I think the periodic high-CPU spikes are caused by the autosnap.py process which starts (and ends) every minute.

I've done some research on the Issue Tracker and while the issue has been reported recently, it's unclear to me if there's a stable workaround (like a patched autosnap.py) or if the mechanism will be changed in a later release of FreeNAS:
https://redmine.ixsystems.com/issues/25757
https://redmine.ixsystems.com/issues/27478

Can you please help me?
Thanks in advance

 

[dlavigne]

Were you able to mitigate this (perhaps with that additional RAM)?

There will be a replication rewrite some time this year, but the target date has not been confirmed yet.

 

[vlado99]

I think your problem might be related to the unsupported controller "HPE Smart Array E208i-p SR Gen10" [1]. This controller is not listed among supported HW [2]. I've seen similar syndromes recently with HPE Smart Array P840. Strange thing is that ciss driver does not complain about unsupported HW. (HTH)

[1] https://psnow.ext.hpe.com/doc/PSN1009955118USEN.pdf
[2] https://www.freebsd.org/releases/11.1R/hardware.html
[3] https://www.freebsd.org/cgi/man.cgi?query=ciss&sektion=4&manpath=freebsd-release-ports