Date: Mon, 21 Apr 2025 23:09:46 +0100 From: void <void@f-m.fm> To: freebsd-hackers@freebsd.org Subject: Re: methods of hyperthreading on or off Message-ID: <aAbCKnsTvj4DYnNI@int21h> In-Reply-To: <238B56E3-F603-4967-98E6-5B321B529A5F@jnielsen.net> References: <aAYtYBDlikQ8BvPW@int21h> <238B56E3-F603-4967-98E6-5B321B529A5F@jnielsen.net>
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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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