On Tue, Sep 27, 2016 at 10:48 AM, Larry Finger <larry.fin...@lwfinger.net> wrote: > On 09/26/2016 10:12 PM, Doug Smythies wrote: >> >> 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. > > > for i in 1 2 3 4; do while : ; do : ; done & done > > triggered the fault in a few minutes. >> >> >>> >>>>> 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%. > > > While the infinite loops were running, the temps were: > > finger@linux-1t8h:~/rtlwifi_new> sensors > coretemp-isa-0000 > Adapter: ISA adapter > Physical id 0: +83.0°C (high = +84.0°C, crit = +100.0°C) > Core 0: +83.0°C (high = +84.0°C, crit = +100.0°C) > Core 1: +74.0°C (high = +84.0°C, crit = +100.0°C)
It looks like the trip point (high) temperature was exceeded causing thermal throttling to kick in. > After the fault occurs, I get > > finger@linux-1t8h:~/rtlwifi_new> sensors > coretemp-isa-0000 > Adapter: ISA adapter > Physical id 0: +44.0°C (high = +84.0°C, crit = +100.0°C) > Core 0: +43.0°C (high = +84.0°C, crit = +100.0°C) > Core 1: +41.0°C (high = +84.0°C, crit = +100.0°C) So after that it stays at 400 MHz forever, right? >>>>> >>>>> 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? > > > Toshiba Tecra A50-A with CPU Model: 6.60.3 "Intel(R) Core(TM) i7-4600M CPU @ > 2.90GHz. That is a dual-core unit with hyperthreading. > > @Rafael: As I write this, the system has been running the infinite loop test > for almost 5 hours with kernel 4.7. I will leave that running while I'm > gone, but I am certain that it is OK. OK, and what temperatures do you see while doing this? Thanks, Rafael
