Date: Sun, 3 Jun 2018 20:36:28 +0100 From: Pete French <petefrench@ingresso.co.uk> To: Mike Tancsa <mike@sentex.net>, Don Lewis <truckman@FreeBSD.org> Cc: eric@vangyzen.net, freebsd-stable@freebsd.org, freebsd@hda3.com, avg@freebsd.org Subject: Re: Ryzen issues on FreeBSD ? (with sort of workaround) Message-ID: <a9e73587-465e-1db4-2f36-cc0af54a7024@ingresso.co.uk> In-Reply-To: <2a54be25-f845-e493-37e7-403247383e9e@sentex.net> References: <tkrat.e96200e0b688ca3c@FreeBSD.org> <E1fP2HW-000HG4-KR@dilbert.ingresso.co.uk> <tkrat.5527722618de87c7@FreeBSD.org> <d32a66f4-2795-831e-6f4d-8d299ebfdbea@sentex.net> <0e8b197f-15b2-b865-b532-cee2a20f2b42@ingresso.co.uk> <2a54be25-f845-e493-37e7-403247383e9e@sentex.net>
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On 03/06/2018 18:49, Mike Tancsa wrote: > I have c-states disabled on the ryzen both for FreeBSD and Linux. To > disable SMP on the Epyc doesnt seem to be possible. But then again kill > off 31 cores is a heavy cost to pay for stability :( When I am back at > the office, I will see if a recent checkout of HEAD still freezes the Epyc. Agreed about the performance hit turning off SMP! Am hoping its a temporary thing, and if we can show it *is* SMP then maybe that will hepl with a fix, as there cant be that many places where SMP is handled differently to real cores I would think. If you could test then that would be great! cheers, -pete.
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