RPi4b 13.0-Current, big performance hit with HDMI connected

Andy McClements ajm at ip-ether.net
Sun Jan 3 21:25:14 UTC 2021


On 03/01/2021 18:58, Andy McClements wrote:
> This may not be news to folks around here but it suprised me.
>
> I was just doing some very quick performance checks having got my RPi4b
> to boot from SSD. I wanted to verify CPU frequency scaling was working
> so did a quick net and disk throughput check.

APOLOGIES - AGAIN !

The discrepancy I saw, was due to the kernel cpufreq module being 
loaded, but powerd not enabled, by default, in this build.

I had done a 'powerd -v' in a shell in one case, but not the other, so 
one set of results were at 600MHz, the other at 1500MHz.

Doh !


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