could it be because with USB-SSD the kernel detects it as drive (smart works and also does hdparm) and uses DMA whereas in USB-SD kernel detects and attaches to usbstor but then has to do pio and cpu intensive low efficency transfer methods rather than DMA ? This means that kernel is doing a lot of job to write/read to usb and will not show up in top ... but still since CPU is being used constantly CPU gets heated up .... just a hypothesis ... someone can comment on this
if that is the case how to force UDMA for usb memorystick kind of devices ? tried googling ... no answer On 2/6/15, Bhasker C V <bhas...@unixindia.com> wrote: > could it be because with USB-SSD the kernel detects it as drive (smart > works and also does hdparm) and uses DMA whereas in USB-SD kernel > detects and attaches to usbstor but then has to do pio and cpu > intensive low efficency transfer methods rather than DMA ? > This means that kernel is doing a lot of job to write/read to usb and > will not show up in top ... but still since CPU is being used > constantly CPU gets heated up .... > just a hypothesis ... someone can comment on this > > > > > On 2/6/15, Bhasker C V <bhas...@unixindia.com> wrote: >> Hi, >> >> The same system running on the USB-SSD behaves nicely. Less than 60C >> always even when watching videos on youtube. However when I boot from >> USB-SD adapter then CPU starts heating to 80C >> There is no apparent message I can see in dmesg or syslog >> >> >> On 2/5/15, Burhan Hanoglu <burhano...@gmail.com> wrote: >>> Hi, >>> >>> Does it happen only when the OS is running on microSD? Have you tried to >>> boot using a live iso either on a CD or on a usb stick? Have you looked >>> thru /var/log/syslog and dmesg to see if there is anything relevant? >>> >>> Regards, >>> Burhan >>> >>> On Fri, Feb 6, 2015 at 12:18 AM, Bhasker C V <bhas...@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: >>>> >>>> >>>> -- >>>> To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org >>>> with a subject of "unsubscribe". Trouble? Contact >>>> listmas...@lists.debian.org >>>> Archive: >>>> https://lists.debian.org/CAPLCSGCA3+NXH3o07Zz9G+=CCVbYMWjnRnLzdWJf44H1xHc=k...@mail.gmail.com >>>> >>>> >>> >> > -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: https://lists.debian.org/caplcsgdjs6y-zf9osf1raswm0ym7fjcntg3f2ftwakvgwyc...@mail.gmail.com
