bhyve - uses 10% cpu in idle

[Kennyvb8]

is it normal now in 11.1 that bhyve uses 10% in idle per vm ?

 

[nightshade00013]

If the VM is running, it would not surprise me a bit. It also depends on what cpu you are using in your FreeNAS. A Pentium G would have a lot more usage at idle than a Dual Xeon E5-2670 as one has a lot less cores and horsepower than the other.

 

[Kennyvb8]

Intel(R) Core(TM) i5-3570K CPU @ 3.40GHz
in FreeNAS 10 it used like 0.1-1% so something has changed the way bhyve works. its the same VMs I had in previous FreeNAS.

 

[nikdom]

I have the same problem.

Code:

34042 root			14  20	0  5185M  1215M kqread  1  25.9H  32.58% bhyve
34347 root			14  20	0  2113M  1043M kqread  3  25.8H  26.64% bhyve
34235 root			13  20	0  1087M   657M kqread  0  26.2H  26.43% bhyve

CPU is a Intel(R) Atom(TM) CPU C2550 @ 2.40GHz.

Happenes only since the last upgrade to version FreeNAS-11.1-RELEASE.

Did anyone find the root cause for this?

 

[Kennyvb8]

Soooo no one else knows about this ?

 

[MartinHerrman]

Today I installed my first bhyve VM on FreeNAS 11.1. The VM is a very light one, running pihole on ubuntu 16.04 server. When using 'top' I also see that the VM is constantly using 10%.

I cannot compare with previous FreeNAS versions. My system is a 16GB RAM, Intel C2550, 3 disks.

Maybe you could create a bug report?

 

[MartinHerrman]

https://wiki.freebsd.org/WaitChannels

Reading this it means that the bhyve process (WCPU = 10%, State = kqread) uses CPU to wait for an event to arrive on kqueue:

https://en.wikipedia.org/wiki/Kqueue

 

[Kennyvb8]

Hmm but in FreeNAS 10 it used 0.1-1% so what changed?

Where do I make a Bug report?


Sent from my iPhone using Tapatalk

 

[MartinHerrman]

FreeNAS issue tracker can be found here:

https://redmine.ixsystems.com/

I searched the existing ones for bhyve cpu issues, but that didn't give me any results.

I also searched the FreeBSD issue tracker at:

https://bugs.freebsd.org/bugzilla/

There I also didn't find any similar problems.

 

[Kennyvb8]

Bug #27658

 

[MartinHerrman]

thanks, I added myself as a watcher to the bug

 

[nikdom]

no change with FreeNAS-11.1-U1.
btw. i cannot access the bug, maybe i was searching at the wrong place. could you provide the full link here? thank you!

 

[Kennyvb8]

no change with FreeNAS-11.1-U1.
btw. i cannot access the bug, maybe i was searching at the wrong place. could you provide the full link here? thank you!

Yea i see No change aswell.
A moderator changed it to private Bug. Because of debug info from My server

 

[corv]

Same issue here, unusually high CPU usage for idle bhyve VM.

 

[ewsclass66]

Hey Guys,
I am having the same issue, has there been any developments on this?

 

[MartinHerrman]

Issue still exists for me with 11.1-U4.

I am not allowed to read the created bug report, maybe because it contains personal data from Kenny.

 

[nikdom]

11.1-U5 still has the issue. Any news in the hidden bug report?

 

[Kennyvb8]

Nope. Not a damn thing


Sent from my iPhone using Tapatalk

 

[tslw]

I am seeing the same issue with 11.2-U1. bhyve takes 10-20% of the cpu (whereas the programs in the VM take just a few percent in the VM).
Also middlewared is using a log of CPU.

Any news on the private bug report?

 

[alex902]

Same in FreeNAS-11.3-RELEASE

Any news on the bug?