From randyf@grimmy.eng.sun.com Thu Feb 12 16:19:53 2009 Received: from sunmail3mpk.sfbay.sun.com (sunmail3mpk.SFBay.Sun.COM [129.146.11.52]) by sac.sfbay.sun.com (8.13.8+Sun/8.13.8) with ESMTP id n1D0JrVO022780 for ; Thu, 12 Feb 2009 16:19:53 -0800 (PST) Received: from brm-avmta-1.central.sun.com (brm-avmta-1.Central.Sun.COM [129.147.4.11]) by sunmail3mpk.sfbay.sun.com (8.13.7+Sun/8.13.7/ENSMAIL,v2.2) with ESMTP id n1D0Jl0s001808; Thu, 12 Feb 2009 16:19:53 -0800 (PST) Received: from pmxchannel-daemon.brm-avmta-1.central.sun.com by brm-avmta-1.central.sun.com (Sun Java System Messaging Server 6.2-3.04 (built Jul 15 2005)) id <0KEZ00801A94R700@brm-avmta-1.central.sun.com>; Thu, 12 Feb 2009 17:19:52 -0700 (MST) Received: from grimmy.sfbay.sun.com ([129.146.108.114]) by brm-avmta-1.central.sun.com (Sun Java System Messaging Server 6.2-3.04 (built Jul 15 2005)) with ESMTP id <0KEZ00KMLA93S380@brm-avmta-1.central.sun.com>; Thu, 12 Feb 2009 17:19:51 -0700 (MST) Received: from grimmy.eng.sun.com (localhost [127.0.0.1]) by grimmy.sfbay.sun.com (8.13.8+Sun/8.13.8) with ESMTP id n1D04nHx027355; Thu, 12 Feb 2009 16:04:49 -0800 (PST) Received: (from randyf@localhost) by grimmy.eng.sun.com (8.13.8+Sun/8.13.8/Submit) id n1D04nhf027351; Thu, 12 Feb 2009 16:04:49 -0800 (PST) Date: Thu, 12 Feb 2009 16:04:49 -0800 (PST) From: Randy Fishel Subject: Turbo mode observability [PSARC/2009/101 Self Review] To: PSARC-ext@sun.com Cc: Rafael.Vanoni@sun.com, aubrey.li@intel.com, tesla-dev@opensolaris.org Message-id: <200902130004.n1D04nhf027351@grimmy.eng.sun.com> Content-transfer-encoding: 7BIT X-PMX-Version: 5.4.1.325704 Status: RO Content-Length: 1830 I am sponsoring this case for Rafael Vanoni and Aubrey Li. It proposes a kstat module for observing turbo mode on Intel processors. It proposes a micro/patch binding and a commited module. I believe that this case qualifies as a self-review, should someone request, it can be turned into a fasttrack. Template Version: @(#)sac_nextcase %I% %G% SMI This information is Copyright 2009 Sun Microsystems 1. Introduction 1.1. Project/Component Working Name: Turbo mode observability 1.2. Name of Document Author/Supplier: Author: Rafael Vanoni 1.3 Date of This Document: 12 February, 2009 4. Technical Description This RFE proposes to integrate observability features for Intel's "Turbo Mode" feature. This functionality improves system performance by raising the operating frequency of a subset of the system's cores when at least half of the total amount of cores are idle and there's is thermal headroom to do so. The OS can observe this behavior through the APERF and MPERF registers. The proposed implementation will export the value of these registers through a new kstats module, name "turbo". Allowing kstat consumers to easily report when the system goes in/out of turbo mode. Example usage: $ kstat -m turbo -i 7 module: turbo instance: 7 name: turbo class: misc crtime 40.232317728 snaptime 66086.209235185 turbo_acnt 13060929505 turbo_mcnt 13504899451 turbo_supported 1 Interface stability: Committed Release Binding: Micro/patch 6. Resources and Schedule 6.4. Steering Committee requested information 6.4.1. Consolidation C-team Name: ON 6.5. ARC review type: Automatic 6.6. ARC Exposure: open From Edward.Shu@sun.com Thu Feb 12 19:01:07 2009 Received: from sunmail4.singapore.sun.com (sunmail4.Singapore.Sun.COM [129.158.71.19]) by sac.sfbay.sun.com (8.13.8+Sun/8.13.8) with ESMTP id n1D316v5027315 for ; Thu, 12 Feb 2009 19:01:07 -0800 (PST) Received: from nwk-avmta-1.SFBay.Sun.COM (nwk-avmta-1.SFBay.Sun.COM [129.146.11.74]) by sunmail4.singapore.sun.com (8.13.4+Sun/8.13.3/ENSMAIL,v2.2) with ESMTP id n1D30xaO000555 for <@sunmail2sca.sfbay.sun.com:PSARC-ext@sun.com>; Fri, 13 Feb 2009 11:01:05 +0800 (SGT) Received: from pmxchannel-daemon.nwk-avmta-1.sfbay.Sun.COM by nwk-avmta-1.sfbay.Sun.COM (Sun Java System Messaging Server 6.2-3.04 (built Jul 15 2005)) id <0KEZ00A0NHPQKS00@nwk-avmta-1.sfbay.Sun.COM> for PSARC-ext@sun.com (ORCPT PSARC-ext@sun.com); Thu, 12 Feb 2009 19:01:02 -0800 (PST) Received: from sineb-mail-1.sun.com ([192.18.19.6]) by nwk-avmta-1.sfbay.Sun.COM (Sun Java System Messaging Server 6.2-3.04 (built Jul 15 2005)) with ESMTP id <0KEZ000F0HPNA7A0@nwk-avmta-1.sfbay.Sun.COM> for PSARC-ext@sun.com (ORCPT PSARC-ext@sun.com); Thu, 12 Feb 2009 19:01:00 -0800 (PST) Received: from fe-apac-05.sun.com (fe-apac-05.sun.com [192.18.19.176] (may be forged)) by sineb-mail-1.sun.com (8.13.6+Sun/8.12.9) with ESMTP id n1D30wrg005854 for ; Fri, 13 Feb 2009 03:00:58 +0000 (GMT) Received: from conversion-daemon.mail-apac.sun.com by mail-apac.sun.com (Sun Java(tm) System Messaging Server 7.0-3.01 64bit (built Dec 23 2008)) id <0KEZ00M00HFDQW00@mail-apac.sun.com> for PSARC-ext@sun.com (ORCPT PSARC-ext@sun.com); Fri, 13 Feb 2009 11:00:58 +0800 (SGT) Received: from [129.158.218.35] ([unknown] [129.158.218.35]) by mail-apac.sun.com (Sun Java(tm) System Messaging Server 7.0-3.01 64bit (built Dec 23 2008)) with ESMTPSA id <0KEZ00JT5HPL2EI0@mail-apac.sun.com>; Fri, 13 Feb 2009 11:00:58 +0800 (SGT) Date: Fri, 13 Feb 2009 11:00:29 +0800 From: Edward Shu Subject: Re: Turbo mode observability [PSARC/2009/101 Self Review] In-reply-to: <200902130004.n1D04nhf027351@grimmy.eng.sun.com> Sender: Edward.Shu@sun.com To: Randy Fishel Cc: PSARC-ext@sun.com, Rafael.Vanoni@sun.com, aubrey.li@intel.com, tesla-dev@opensolaris.org Message-id: <4994E24D.3070300@sun.com> MIME-version: 1.0 Content-type: text/plain; charset=GB2312 Content-transfer-encoding: 7BIT X-PMX-Version: 5.4.1.325704 References: <200902130004.n1D04nhf027351@grimmy.eng.sun.com> User-Agent: Thunderbird 2.0.0.9 (X11/20080213) Status: RO Content-Length: 1390 Randy Fishel: > I am sponsoring this case for Rafael Vanoni and Aubrey Li. It proposes > a kstat module for observing turbo mode on Intel processors. It proposes > a micro/patch binding and a commited module. I believe that this case > qualifies as a self-review, should someone request, it can be turned > into a fasttrack. > > > Template Version: @(#)sac_nextcase %I% %G% SMI > This information is Copyright 2009 Sun Microsystems > 1. Introduction > 1.1. Project/Component Working Name: > Turbo mode observability > 1.2. Name of Document Author/Supplier: > Author: Rafael Vanoni > 1.3 Date of This Document: > 12 February, 2009 > 4. Technical Description > This RFE proposes to integrate observability features for Intel's > "Turbo Mode" feature. This functionality improves system performance > by raising the operating frequency of a subset of the system's cores > when at least half of the total amount of cores are idle and there's > is thermal headroom to do so. > I think the transition is controlled by some firmware, and the OS can only read the state instead of controlling this behavior. How often does the OS read the register to refresh the kstats? -- Best Regards, Ming. ------------------------------------------ -Edward Shu -Solaris x86 Engineering, Sun Microsystems -tele: +86-10-62673100 __________________________________________ From Rafael.Vanoni@sun.com Thu Feb 12 19:33:10 2009 Received: from sunmail5.uk.sun.com (sunmail5.UK.Sun.COM [129.156.85.165]) by sac.sfbay.sun.com (8.13.8+Sun/8.13.8) with ESMTP id n1D3X9rJ028101 for ; Thu, 12 Feb 2009 19:33:10 -0800 (PST) Received: from brm-avmta-1.central.sun.com (brm-avmta-1.Central.Sun.COM [129.147.4.11]) by sunmail5.uk.sun.com (8.13.8+Sun/8.13.8/ENSMAIL,v2.2) with ESMTP id n1D3X6RP020057 for <@sunmail2sca.sfbay.sun.com:PSARC-ext@sun.com>; Fri, 13 Feb 2009 03:33:09 GMT Received: from pmxchannel-daemon.brm-avmta-1.central.sun.com by brm-avmta-1.central.sun.com (Sun Java System Messaging Server 6.2-3.04 (built Jul 15 2005)) id <0KEZ00409J76WE00@brm-avmta-1.central.sun.com> for PSARC-ext@sun.com (ORCPT PSARC-ext@sun.com); Thu, 12 Feb 2009 20:33:06 -0700 (MST) Received: from sca-es-mail-1.sun.com ([192.18.43.132]) by brm-avmta-1.central.sun.com (Sun Java System Messaging Server 6.2-3.04 (built Jul 15 2005)) with ESMTP id <0KEZ00MP3J751TC0@brm-avmta-1.central.sun.com> for PSARC-ext@sun.com (ORCPT PSARC-ext@sun.com); Thu, 12 Feb 2009 20:33:05 -0700 (MST) Received: from fe-sfbay-09.sun.com ([192.18.43.129]) by sca-es-mail-1.sun.com (8.13.7+Sun/8.12.9) with ESMTP id n1D3X5uw019495 for ; Thu, 12 Feb 2009 19:33:05 -0800 (PST) Received: from conversion-daemon.fe-sfbay-09.sun.com by fe-sfbay-09.sun.com (Sun Java(tm) System Messaging Server 7.0-3.01 64bit (built Dec 23 2008)) id <0KEZ00200J5BSO00@fe-sfbay-09.sun.com> for PSARC-ext@sun.com (ORCPT PSARC-ext@sun.com); Thu, 12 Feb 2009 19:33:05 -0800 (PST) Received: from [192.168.1.66] ([unknown] [76.254.2.176]) by fe-sfbay-09.sun.com (Sun Java(tm) System Messaging Server 7.0-3.01 64bit (built Dec 23 2008)) with ESMTPSA id <0KEZ00H3ZJ74LSB0@fe-sfbay-09.sun.com>; Thu, 12 Feb 2009 19:33:05 -0800 (PST) Date: Thu, 12 Feb 2009 19:33:04 -0800 From: Rafael Vanoni Subject: Re: Turbo mode observability [PSARC/2009/101 Self Review] In-reply-to: <4994E24D.3070300@sun.com> Sender: Rafael.Vanoni@sun.com To: Edward Shu Cc: Randy Fishel , PSARC-ext@sun.com, aubrey.li@intel.com, tesla-dev@opensolaris.org Message-id: <4994E9F0.1020208@sun.com> MIME-version: 1.0 Content-type: text/plain; format=flowed; charset=ISO-8859-1 Content-transfer-encoding: 7BIT X-PMX-Version: 5.4.1.325704 References: <200902130004.n1D04nhf027351@grimmy.eng.sun.com> <4994E24D.3070300@sun.com> User-Agent: Thunderbird 2.0.0.18 (X11/20081125) Status: RO Content-Length: 1416 Edward Shu wrote: > Randy Fishel: >> I am sponsoring this case for Rafael Vanoni and Aubrey Li. It proposes >> a kstat module for observing turbo mode on Intel processors. It proposes >> a micro/patch binding and a commited module. I believe that this case >> qualifies as a self-review, should someone request, it can be turned >> into a fasttrack. >> >> >> Template Version: @(#)sac_nextcase %I% %G% SMI >> This information is Copyright 2009 Sun Microsystems >> 1. Introduction >> 1.1. Project/Component Working Name: >> Turbo mode observability >> 1.2. Name of Document Author/Supplier: >> Author: Rafael Vanoni >> 1.3 Date of This Document: >> 12 February, 2009 >> 4. Technical Description >> This RFE proposes to integrate observability features for Intel's >> "Turbo Mode" feature. This functionality improves system performance >> by raising the operating frequency of a subset of the system's cores >> when at least half of the total amount of cores are idle and there's >> is thermal headroom to do so. >> > I think the transition is controlled by some firmware, and the OS can > only read the state instead of controlling this behavior. How often > does the OS read the register to refresh the kstats? > Yes, the paragraph is describing the behavior of the feature, not implying that the OS controls it. The registers are read on demand by kstat or its consumers. Rafael From Rafael.Vanoni@Sun.COM Thu Feb 12 21:11:34 2009 Received: from sunmail2sca.sfbay.sun.com (sunmail2sca.SFBay.Sun.COM [129.145.155.234]) by sac.sfbay.sun.com (8.13.8+Sun/8.13.8) with ESMTP id n1D5BYDJ021573 for ; Thu, 12 Feb 2009 21:11:34 -0800 (PST) Received: from nwk-avmta-1.SFBay.Sun.COM (nwk-avmta-1.SFBay.Sun.COM [129.146.11.74]) by sunmail2sca.sfbay.sun.com (8.13.7+Sun/8.13.7/ENSMAIL,v2.2) with ESMTP id n1D5BYVF028330 for <@sunmail2sca.sfbay.sun.com:PSARC-ext@sun.com>; Thu, 12 Feb 2009 21:11:34 -0800 (PST) Received: from pmxchannel-daemon.nwk-avmta-1.sfbay.Sun.COM by nwk-avmta-1.sfbay.Sun.COM (Sun Java System Messaging Server 6.2-3.04 (built Jul 15 2005)) id <0KEZ00F01NRAB700@nwk-avmta-1.sfbay.Sun.COM> for PSARC-ext@sun.com (ORCPT PSARC-ext@sun.com); Thu, 12 Feb 2009 21:11:34 -0800 (PST) Received: from sca-es-mail-1.sun.com ([192.18.43.132]) by nwk-avmta-1.sfbay.Sun.COM (Sun Java System Messaging Server 6.2-3.04 (built Jul 15 2005)) with ESMTP id <0KEZ006WPNR94W70@nwk-avmta-1.sfbay.Sun.COM> for PSARC-ext@sun.com (ORCPT PSARC-ext@sun.com); Thu, 12 Feb 2009 21:11:33 -0800 (PST) Received: from fe-sfbay-09.sun.com ([192.18.43.129]) by sca-es-mail-1.sun.com (8.13.7+Sun/8.12.9) with ESMTP id n1D5BX0u023440 for ; Thu, 12 Feb 2009 21:11:33 -0800 (PST) Received: from conversion-daemon.fe-sfbay-09.sun.com by fe-sfbay-09.sun.com (Sun Java(tm) System Messaging Server 7.0-3.01 64bit (built Dec 23 2008)) id <0KEZ00G00NM77Y00@fe-sfbay-09.sun.com> for PSARC-ext@sun.com (ORCPT PSARC-ext@sun.com); Thu, 12 Feb 2009 21:11:33 -0800 (PST) Received: from [192.168.1.66] ([unknown] [76.254.2.176]) by fe-sfbay-09.sun.com (Sun Java(tm) System Messaging Server 7.0-3.01 64bit (built Dec 23 2008)) with ESMTPSA id <0KEZ00GIUNR8CZ00@fe-sfbay-09.sun.com>; Thu, 12 Feb 2009 21:11:33 -0800 (PST) Date: Thu, 12 Feb 2009 21:11:32 -0800 From: Rafael Vanoni Subject: Re: Turbo mode observability [PSARC/2009/101 Self Review] In-reply-to: <4994E9F0.1020208@sun.com> Sender: Rafael.Vanoni@Sun.COM To: Rafael Vanoni Cc: Edward Shu , Randy Fishel , PSARC-ext@Sun.COM, aubrey.li@intel.com, tesla-dev@opensolaris.org Message-id: <49950104.6080702@sun.com> MIME-version: 1.0 Content-type: text/plain; format=flowed; charset=ISO-8859-1 Content-transfer-encoding: 7BIT X-PMX-Version: 5.4.1.325704 References: <200902130004.n1D04nhf027351@grimmy.eng.sun.com> <4994E24D.3070300@sun.com> <4994E9F0.1020208@sun.com> User-Agent: Thunderbird 2.0.0.18 (X11/20081125) Status: RO Content-Length: 1747 Rafael Vanoni wrote: > Edward Shu wrote: >> Randy Fishel: >>> I am sponsoring this case for Rafael Vanoni and Aubrey Li. It proposes >>> a kstat module for observing turbo mode on Intel processors. It >>> proposes >>> a micro/patch binding and a commited module. I believe that this case >>> qualifies as a self-review, should someone request, it can be turned >>> into a fasttrack. >>> >>> >>> Template Version: @(#)sac_nextcase %I% %G% SMI >>> This information is Copyright 2009 Sun Microsystems >>> 1. Introduction >>> 1.1. Project/Component Working Name: >>> Turbo mode observability >>> 1.2. Name of Document Author/Supplier: >>> Author: Rafael Vanoni >>> 1.3 Date of This Document: >>> 12 February, 2009 >>> 4. Technical Description >>> This RFE proposes to integrate observability features for Intel's >>> "Turbo Mode" feature. This functionality improves system performance >>> by raising the operating frequency of a subset of the system's cores >>> when at least half of the total amount of cores are idle and there's >>> is thermal headroom to do so. >> I think the transition is controlled by some firmware, and the OS can >> only read the state instead of controlling this behavior. How often >> does the OS read the register to refresh the kstats? >> > > Yes, the paragraph is describing the behavior of the feature, not > implying that the OS controls it. The registers are read on demand by > kstat or its consumers. Correction, Aubrey's implementation reads the registers at every P-state transition if the system supports turbo mode. A kstat consumer may also cause the registers to be read if the CPU is in the highest P-state (P0), so that we have the most up to date value. Rafael