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Date: Fri, 6 Aug 2010 18:09:54 -0400 (EDT) From: Justin Piszcz <jpiszcz@...idpixels.com> To: linux-kernel@...r.kernel.org cc: Alan Piszcz <ap@...arrain.com> Subject: 2.6.35: cpu_idle bug report / on i7 870 cpu (x86_64) 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. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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