linux-kernel - 2.6.35: cpu_idle bug report / on i7 870 cpu (x86

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Message-ID: <alpine.DEB.2.00.1008061800530.5241@p34.internal.lan>
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.
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