Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751833AbbEGC7j (ORCPT ); Wed, 6 May 2015 22:59:39 -0400 Received: from cmta11.telus.net ([209.171.16.84]:44731 "EHLO cmta11.telus.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751459AbbEGC7g (ORCPT ); Wed, 6 May 2015 22:59:36 -0400 X-Greylist: delayed 492 seconds by postgrey-1.27 at vger.kernel.org; Wed, 06 May 2015 22:59:36 EDT X-Authority-Analysis: v=2.0 cv=PspNmXw3 c=1 sm=2 a=zJWegnE7BH9C0Gl4FFgQyA==:17 a=kj9zAlcOel0A:10 a=aatUQebYAAAA:8 a=Pyq9K9CWowscuQLKlpiwfMBGOR0=:19 a=danhDmx_AAAA:8 a=0q5oOGV5vegsG-pj_H0A:9 a=CjuIK1q_8ugA:10 a=zJWegnE7BH9C0Gl4FFgQyA==:117 X-Telus-Outbound-IP: 173.180.45.4 From: "Doug Smythies" To: "'Martin Steigerwald'" Cc: , , "'Kristen Carlson Accardi'" References: <2208008.uDRZL3Gdb7@merkaba> In-Reply-To: <2208008.uDRZL3Gdb7@merkaba> Subject: RE: [BUG] ThinkPad T520 overheating with P-State driver Date: Wed, 6 May 2015 19:51:19 -0700 Message-ID: <000601d08870$b2979e60$17c6db20$@net> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Office Outlook 12.0 Thread-Index: AdCIPFwyjTMcPYX0ROCHLIByB9WLPgAMb91w Content-Language: en-ca Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1441 Lines: 43 On 2015.05.06 13:37 Martin Steigerwald wrote: > I get frequencies like: > > 3080566 > 3068945 > 3009082 > 2999902 Please know that the intel_pstate driver reports actual CPU frequencies over the last sample interval. In terms of heat, they don't mean anything, you would have to look at how much time the CPU spent in the C0 and other states. > Yet with acpi-cpufreq without limiting maximum performance at all, I get the > following with the *same* workload: > 2501000 > 2501000 > 1000000 > 1000000 Please know that the acpi-cpufreq driver reports what frequency (pstate) It is asking for, not what might actually be happening. If your CPU 2 and 3 were ever active during that sample time They would be at the same frequency as your turbostate CPU 0 or 1, which ever is higher. > There is also some other bug report about this: > Please change intel_pstate default to disable > https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1188647 > appears to be quite old, but still seems unresolved. That bug report is very old, and is closed. I made a late entry on that bug report on 2014.06.08, and have submitted a patch set to deal with, among other things, the long duration issue. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/