Re: Debian CPU heating up <no apparent cpu activity>
I had a similar problem with certain hardware configs causing a kworker to hog the CPU due to ACPI problems
I found the tips here helpful in solving that one
https://bbs.archlinux.org/viewtopic.php?id=184913
Sent from iPhone
> On 5 Feb 2015, at 22:18, Bhasker C V <bhasker@unixindia.com> wrote:
>
> Hi,
>
> I am trying to create 2 systems (both are portable and works on USB)
>
> 1. USB<->SATA bridge SSD with linux kernel 3.19.0 (self compiled).
> this systems works fine and the operating temperature on the DELL
> machine I am using is about 54C to 60C
>
> 2. USB<->microSD with MicroSD card (sandisk 32GB).
> this system when it works starts heating up !!! temperatures sore
> to 80C.(in a matter of 2-3 minutes)
>
> BASE CONDITIONS (common for both systems):
> * Both the systems are jessie
> * Both are running idential kernel and initrd (infact exact binary
> copies on both)
> * top shows very low CPU utilisation
> * iotop shows occasional R/W but not too much of write/read (less
> than 0.1 kb/sec)
> * both are currently text mode only
> * system is DELL Q15R core-i7-2630QM (see cpuinfo in the end)
>
> on SSD: vmstat
>
> 0 0 0 7003648 44012 896832 0 0 0 12 157 583 1
> 0 99 0 0
> 0 0 0 7003532 44012 896840 0 0 0 0 136 429 0
> 0 100 0 0
> 0 0 0 7003760 44012 896840 0 0 0 0 205 510 0
> 0 100 0 0
> 0 0 0 7003904 44012 896840 0 0 0 0 152 513 0
> 0 100 0 0
> (using graphics and so sligtly low in mem but this is on the system
> which does not heat up)
>
> on SDCARD: vmstat
>
> 0 0 0 7935012 20884 184812 0 0 0 0 110 313 0
> 0 100 0 0
> 0 0 0 7935012 20884 184812 0 0 0 0 97 286 0
> 0 100 0 0
> 0 0 0 7935012 20884 184812 0 0 0 0 99 275 0
> 0 100 0 0
> 0 0 0 7935012 20884 184812 0 0 0 0 103 280 0
> 0 100 0 0
> 0 0 0 7934864 20892 184804 0 0 0 20 176 470 0
> 0 100 0 0
>
>
> I even applied all CPU microcodes and got the message
> perf_event_intel: PEBS enabled due to microcode update
>
>
> Has someone encountered this before ? I am not sure what is causing
> the fans to run fast and CPU to heatup when I use the OS on SD card ?
> I agree SD is slow but that will be IO rather than CPU right ? will
> that cause heatup ?
>
> iotop also shows READ/WRITE only occasionally SSD for
> I am fully exhausted not kwowing what to do. Can anyone help please ?
>
>
> -------------------- CPU INFO -----------------------
> processor : 7
> vendor_id : GenuineIntel
> cpu family : 6
> model : 42
> model name : Intel(R) Core(TM) i7-2630QM CPU @ 2.00GHz
> stepping : 7
> microcode : 0x29
> cpu MHz : 1900.000
> cache size : 6144 KB
> physical id : 0
> siblings : 8
> core id : 3
> cpu cores : 4
> apicid : 7
> initial apicid : 7
> fdiv_bug : no
> f00f_bug : no
> coma_bug : no
> fpu : yes
> fpu_exception : yes
> cpuid level : 13
> wp : yes
> flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
> pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx rdtscp lm
> constant_tsc arch_perfmon pebs bts xtopology nonstop_tsc aperfmperf
> eagerfpu pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16
> xtpr pdcm pcid sse4_1 sse4_2 x2apic popcnt tsc_deadline_timer aes
> xsave avx lahf_lm ida arat epb pln pts dtherm tpr_shadow vnmi
> flexpriority ept vpid xsaveopt
> bugs :
> bogomips : 3990.87
> clflush size : 64
> cache_alignment : 64
> address sizes : 36 bits physical, 48 bits virtual
> power management:
>
>
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