Re: Debian CPU heating up <no apparent cpu activity>
I do not see anything. top does not show anything in the top list ...
it is just that when arranged in high to low CPU usage, the first
process it shows is a kernel process and it is using 0% or 0.5% of CPU
This really puzzles me
Who can take up CPU time without showing up themselves in the 'top'
thereby heating the CPU but hiding itself
On 2/5/15, Andrew Wood <andrew@perpetualmotion.co.uk> wrote:
> 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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>
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