[SOLVED] Re: now on Ryzen performance

Erich Dollansky freebsd.ed.lists at sumeritec.com
Wed Jan 2 14:15:00 UTC 2019


I took a look at the sources of powerd. I did not see any thing I would
suspect to be the cause of the slowdown. All powerd does on my machine
is adjusting the CPU frequency. Mu Ryzen has only three possible
frequencies. What I do not understand, why is powerd requesting a
frequency change to a value not possible?

Powerd itself hardly consumes CPU. Has a system call a problem or gets
the CPU so much irritated when an illegal frequency is requested? 


 On Thu, 27 Dec 2018 09:18:20
+0100 Andrea Venturoli <ml at netfence.it> wrote:

> On 12/21/18 5:40 PM, Andrea Venturoli wrote:
> > Having powerd running or not does not make any difference.  
> After further investigation/testing, powerd is the culprit.
> Earlier I tried stopping it and I confirm it makes no difference; now
> I realize just starting it bring the CPU down by a factor of 50%
> until rebooting.
> After disabling it in /etc/rc.conf my machine is behaving properly.
> I'll try enabling it again when I'll upgrade to 12 (although that
> might happen not so soon).
>   bye & Thanks
> 	av.
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