From owner-freebsd-bugs@freebsd.org Mon Jan 27 02:49:38 2020 Return-Path: Delivered-To: freebsd-bugs@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 6C5C022D245 for ; Mon, 27 Jan 2020 02:49:38 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mailman.nyi.freebsd.org (mailman.nyi.freebsd.org [IPv6:2610:1c1:1:606c::50:13]) by mx1.freebsd.org (Postfix) with ESMTP id 485Z362Jb6z3JNR for ; Mon, 27 Jan 2020 02:49:38 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: by mailman.nyi.freebsd.org (Postfix) id 4F29922D244; Mon, 27 Jan 2020 02:49:38 +0000 (UTC) Delivered-To: bugs@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 4EEFC22D243 for ; Mon, 27 Jan 2020 02:49:38 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) server-signature RSA-PSS (4096 bits) client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 485Z361RCLz3JNQ for ; Mon, 27 Jan 2020 02:49:38 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org (kenobi.freebsd.org [IPv6:2610:1c1:1:606c::50:1d]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) server-signature RSA-PSS (4096 bits)) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 2840D3149 for ; Mon, 27 Jan 2020 02:49:38 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org ([127.0.1.5]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id 00R2ncK2031246 for ; Mon, 27 Jan 2020 02:49:38 GMT (envelope-from bugzilla-noreply@freebsd.org) Received: (from www@localhost) by kenobi.freebsd.org (8.15.2/8.15.2/Submit) id 00R2ncjH031245 for bugs@FreeBSD.org; Mon, 27 Jan 2020 02:49:38 GMT (envelope-from bugzilla-noreply@freebsd.org) X-Authentication-Warning: kenobi.freebsd.org: www set sender to bugzilla-noreply@freebsd.org using -f From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 234733] Setting CPU frequency with sysctl dev.cpu.0.fr slows a Ryzen 2700X down Date: Mon, 27 Jan 2020 02:49:38 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: kern X-Bugzilla-Version: 12.0-STABLE X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Some People X-Bugzilla-Who: cem@freebsd.org X-Bugzilla-Status: New X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: bugs@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-BeenThere: freebsd-bugs@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Bug reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 27 Jan 2020 02:49:38 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D234733 --- Comment #9 from Conrad Meyer --- Another test to try (maybe after entering a non-P0 p-state, not sure if that matters) if you'd like: $ cpucontrol -m '0xc0010061' /dev/cpuctl0 This is the PStateCurLim register, and the low 3 bits are 'CurPstateLimit'.= It represents the highest performance P-state the processor is (currently) all= owed to enter. I don't know why it would be non-zero if the processor is in P0 = at boot, but I suppose it could be a BIOS issue. Finally, you could try just manually checking the last set P-state: $ cpucontrol -m '0xc0010062' /dev/cpuctl0 (Last-set P-state is the low 3 bits of that register.) Or setting P-state 0 across all cpus manually, bypassing hwpstate(4): $ for i in $(jot 16 0) ; do cpucontrol -m '0xc0010062=3D0x0' /dev/cpuctl$i = ; done (Bourne sh; I don't know if that works in csh or anything exotic.) --=20 You are receiving this mail because: You are the assignee for the bug.=