From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S935008Ab0HFWJ5 (ORCPT ); Fri, 6 Aug 2010 18:09:57 -0400 Received: from lucidpixels.com ([75.144.35.66]:60038 "EHLO lucidpixels.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1761842Ab0HFWJz (ORCPT ); Fri, 6 Aug 2010 18:09:55 -0400 Date: Fri, 6 Aug 2010 18:09:54 -0400 (EDT) From: Justin Piszcz To: linux-kernel@vger.kernel.org cc: Alan Piszcz Subject: 2.6.35: cpu_idle bug report / on i7 870 cpu (x86_64) Message-ID: User-Agent: Alpine 2.00 (DEB 1167 2008-08-23) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; format=flowed; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, When cpu_idle is used alongside a core i7 cpu w/cpufreq, the system exhibits delays when typing into a terminal via ssh or VNC, I had changed a few options from 2.6.34 -> 2.6.35 and did not think the cpu_idle would be at fault; however, after going through all of the options and disabling it, the problem went away. < > Cpuidle Driver for Intel Processors The system lags every so often when cpu_idle is enabled. It is quite annoying. All disk subsystems/CPU/etc are OK-- that option causes some nasty side effects. Kernel config: (w/cpu_idle) - exhibits the problem. http://home.comcast.net/~jpiszcz/20100806/config-20100806.1281129405 Removed cpu_idle, problem is gone. http://home.comcast.net/~jpiszcz/20100806/config-20100806.1281131518 In addition, sometimes the system did not reboot (instead I hear the speaker whining solid, not beeping, just a constant whine). And sometimes it failed to reboot between kernel rebuilds. After cpu_idle has been removed from the kernel, all problems have went away. This may have already been reported but I did not find anything on it. Is this driver safe for i7 CPUs and/or who should be using it? Justin.