On Nov 29, 2011, Michal Hocko <mhocko@suse.cz> wrote: 
 
> As I have written in other email could you post your config and collect
> the following data?
> for i in `seq 30`; 
> do 
>         cat /proc/stat > `date +'%s'`
>         sleep 1
> done
> export old_user=0 old_nice=0 old_sys=0 old_idle=0 old_iowait=0; 
> 
> # for all your available CPUs
> grep cpu0 * | while read cpu user nice sys idle iowait rest; 
> do 
>         echo $cpu $(($user-$old_user)) $(($nice-$old_nice)) $(($sys-$old_sys)) $(($idle-$old_idle)) $(($iowait-$old_iowait))
>         old_user=$user old_nice=$nice old_sys=$sys old_idle=$idle old_iowait=$iowait
> done

1322566208:cpu0 5199 0 2931 357890604 2541
1322566209:cpu0 0 0 1 0 0
1322566210:cpu0 0 0 0 0 0
1322566211:cpu0 0 0 0 0 0
1322566212:cpu0 0 0 0 0 0
1322566213:cpu0 0 0 0 0 0
1322566214:cpu0 1 0 0 0 0
1322566215:cpu0 2 0 0 0 0
1322566216:cpu0 3 0 0 0 0
1322566217:cpu0 2 0 0 0 0
1322566218:cpu0 4 0 0 0 0
1322566219:cpu0 1 0 0 0 0
1322566220:cpu0 2 0 0 0 0
1322566221:cpu0 2 0 1 0 0
1322566222:cpu0 1 0 0 0 0
1322566223:cpu0 2 0 0 0 0
1322566224:cpu0 1 0 1 0 0
1322566225:cpu0 1 0 0 0 0
1322566226:cpu0 2 0 0 0 0
1322566227:cpu0 1 0 1 0 0
1322566228:cpu0 2 0 0 0 0
1322566229:cpu0 2 0 0 0 0
1322566230:cpu0 6 0 3 0 0
1322566231:cpu0 1 0 0 0 0
1322566232:cpu0 2 0 0 0 0
1322566233:cpu0 3 0 0 0 0
1322566234:cpu0 2 0 0 0 0
1322566235:cpu0 2 0 2 0 0
1322566236:cpu0 0 0 1 0 0
1322566237:cpu0 1 0 0 0 0

$ grep . -r /sys/devices/system/cpu/cpuidle/
/sys/devices/system/cpu/cpuidle/current_driver:intel_idle
/sys/devices/system/cpu/cpuidle/current_governor_ro:menu

$ grep . -r /sys/devices/system/cpu/cpufreq/
/sys/devices/system/cpu/cpufreq/ondemand/sampling_rate_min:10000
/sys/devices/system/cpu/cpufreq/ondemand/sampling_rate:10000
/sys/devices/system/cpu/cpufreq/ondemand/up_threshold:95
/sys/devices/system/cpu/cpufreq/ondemand/sampling_down_factor:1
/sys/devices/system/cpu/cpufreq/ondemand/ignore_nice_load:0
/sys/devices/system/cpu/cpufreq/ondemand/powersave_bias:0
/sys/devices/system/cpu/cpufreq/ondemand/io_is_busy:1

One thing I have to note, it takes some time (from 30 seconds to 10 minutes) before this bug starts manifesting itself.