Re: methods of hyperthreading on or off

On Mon, Apr 21, 2025 at 12:56:35PM -0600, John Nielsen wrote:

>If you disable it in the BIOS then the OS will never see them. 
>If you disable it via the tunable then the OS will never use them. 

thanks - that's succinct.

>As to whether this will help whatever network throughput issue 
>you’re seeing (or if there could be a better way to approach 
>that) I have no idea.

I was reading this:
https://people.freebsd.org/~olivier/talks/2018_AsiaBSDCon_Tuning_FreeBSD_for_routing_and_firewalling-Paper.pdf

My context is a little different, but same sort of things happening.

It's a freebsd server (dual xeon processors) running bhyve instances.
It doesn't do much else. I noticed throughput freebsd guest on freebsd 
server to be less than (any linux) guest on freebsd server. Did some testing
a few months ago, didn't really get anywhere, then saw the above paper, and
so am looking into it again.

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