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List:       freebsd-hackers
Subject:    Re: How to prevent underclocking when running with 1 redundant power supply
From:       Cy Schubert <Cy.Schubert () cschubert ! com>
Date:       2019-10-28 13:41:57
Message-ID: F1A190F2-21CE-4DBF-8674-3C5DD283F483 () cschubert ! com
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On October 27, 2019 2:07:12 PM PDT, Craig Leres <leres@freebsd.org> wrote:
> I have a nameserver running 11.3-RELEASE-p4. It has a Supermicro
> X9SRi-F 
> motherboard in a 1U chassis with redundant PWS-406P-1R power supplies 
> (400W each).
> 
> Site power is out thanks to a PG&E "public safety power shutdown" and I
> 
> find that the system is really unhappy. It looks like it is 
> underclocking due to one power supply not being powered:
> 
> # sysctl dev.cpu.0.freq_levels dev.cpu.0.freq
> dev.cpu.0.freq_levels: 3001/80000 3000/80000 2900/75926 2700/69558 
> 2600/65698 2500/62669 2400/59709 2200/53206 2100/50412 2000/46962 
> 1800/41676 1700/38423 1600/35918 1500/33467 1300/28074 1200/25787
> dev.cpu.0.freq: 1200
> 
> I found powerd and tried this:
> 
> powerd_enable="YES"
> powerd_flags="-a max -b max -n max"
> 
> which works... once it's started. Now I'm finding one system has a 
> difficult time booting because powerd is started so late in the boot 
> process.
> 
> Is there a sysctl I can put in loader.conf to disable this
> underclocking 
> behavior?
> 
> Thanks!
> 
> 		Craig
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dev.cpu.0.freq can be set by hand (or script).

I suppose your BIOS automatically reduces the clock rate with one power supply \
connected. I assume that's a safety feature one might want to investigate before \
incurring possible undesired consequences. 


-- 
Pardon the typos and autocorrect, small keyboard in use. 
Cy Schubert <Cy.Schubert@cschubert.com>
FreeBSD UNIX: <cy@FreeBSD.org> Web: https://www.FreeBSD.org

The need of the many outweighs the greed of the few.

Sent from my Android device with K-9 Mail. Please excuse my brevity.
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