<![CDATA[Latest "State of the Art" re: hw.smt ?]]>OpenBSD Frens...

What's the latest p00p on hw.smt ?

Been doing some looking around and am not able to suss out what the latest guidance is re: hw.smt and performance.

I get the point about security, just wondering if there are any performance "gotchas" with SMT in the kernel nowadays.

I've seen posts (old) talking about enabling smt in the OpenBSD kernel doesn't get great gains. Is this still current thinking/advice?

I remember when FreeBSD SMT was considered "not that performant" but that's not the case any more. Has OpenBSD followed suit?

Inquiring minds and all that...

]]>https://billboard.bsd.cafe/topic/92/latest-state-of-the-art-re-hw.smtRSS for NodeFri, 01 May 2026 22:52:44 GMTWed, 15 Apr 2026 19:59:38 GMT60<![CDATA[Reply to Latest "State of the Art" re: hw.smt ? on Wed, 15 Apr 2026 20:36:03 GMT]]>The latest would be that it's deprecated and will eventually be replaced: https://www.undeadly.org/cgi?action=article;sid=20260415050032

I personally enable do hw.smt=1 when rebuilding base as it finishes about twice as fast, but I don't notice performance differences other than in compilation.

]]>https://billboard.bsd.cafe/post/256https://billboard.bsd.cafe/post/256Wed, 15 Apr 2026 20:36:03 GMT