On 2016.09.26 18:31 Srinivas Pandruvada wrote: > On Mon, 2016-09-26 at 19:48 -0500, Larry Finger wrote: >> On 09/26/2016 07:21 PM, Rafael J. Wysocki wrote: >>> On Tue, Sep 27, 2016 at 1:53 AM, Larry Finger wrote: >>> But for both we need a reproducer anyway. >> I do not have a reliable reproducer. The condition has always >> happened when >> running a high-compute job such as a 'make -j8' on the kernel, or >> building the >> RPM for openSUSE's implementation of VirtualBox. The latter is what >> I'm using >> for most of my testing.
Run some CPU stressor and get all your CPU's going at 100% load. And watch your core temperatures while you do so. > >>> It also would be good to rule out the thermal throttling (as per >>> the Srinivas' comments). It is almost certainly thermal throttling, or similar causing Clock modulation, of it seems 50%. >>> >>> For now, please tell me what's in >>> /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_min_freq >> 800000 > Your effective freq is lower than 800MHz. One of the possible reason is > thermal throttling. > > What distro you are using? And what make and model of LapTop?
