From mboxrd@z Thu Jan 1 00:00:00 1970 From: bugzilla-daemon@bugzilla.kernel.org Subject: [Bug 176411] New: cpufreq/cpuinfo_cur_freq for i7 5820k Date: Wed, 05 Oct 2016 14:53:35 +0000 Message-ID: Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Return-path: Received: from mail.kernel.org ([198.145.29.136]:49070 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753007AbcJEOxi (ORCPT ); Wed, 5 Oct 2016 10:53:38 -0400 Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 661B7202B8 for ; Wed, 5 Oct 2016 14:53:36 +0000 (UTC) Received: from bugzilla2.web.kernel.org (bugzilla2.web.kernel.org [172.20.200.52]) by mail.kernel.org (Postfix) with ESMTP id 6C98E2026D for ; Wed, 5 Oct 2016 14:53:35 +0000 (UTC) Sender: linux-pm-owner@vger.kernel.org List-Id: linux-pm@vger.kernel.org To: linux-pm@vger.kernel.org https://bugzilla.kernel.org/show_bug.cgi?id=176411 Bug ID: 176411 Summary: cpufreq/cpuinfo_cur_freq for i7 5820k Product: Power Management Version: 2.5 Kernel Version: 4.7.6 Hardware: x86-64 OS: Linux Tree: Mainline Status: NEW Severity: high Priority: P1 Component: cpufreq Assignee: linux-pm@vger.kernel.org Reporter: mike.d.lui@gmail.com Regression: No # cat /proc/cpuinfo | grep model model : 63 model name : Intel(R) Core(TM) i7-5820K CPU @ 3.30GHz ... # cat /sys/devices/system/cpu/cpu*/cpufreq/cpuinfo_cur_freq # cat /proc/[pid]/stat will also show '0' for utime, stime, cutime, and cstime Certain utilities like 'top' and 'ps' will show '0%' for %CPU for a given process, but not for a given CPU. I've upgraded my kernel a few times in the past several weeks, and I noticed this issue before, although I'm not sure the exact kernel version I started noticing this. This same behavior has been reported for an i7 5930k (also 6-core Haswell-E). Performance degradation that I began noticing around the same time may be related. -- You are receiving this mail because: You are the assignee for the bug.