problem about interrupts-Collection of common programming errors
user32569
x86 interrupts
please, I know that when you for example divide by zero, the aproptiate flag is set in CPU flag register. But today I read that there are special interrupt vectors (I think the first 16 in IVT) that are used for such conditions like dividing by zero. So, what I want to ask is, does any situation that couses change som flag also triggers apropriate interrupt? Becouse in school, we used conditional jumps that checks wheather carry flag has been set or not, and I don´t remember there was some inter
at0m33
linux cpu load interrupts
the ksoftirqd process on my root (Ubuntu 12.04 x64 with kernel 3.11.6) causes occasionally a very high usage of the first cpu core (sometimes only 5 minutes, then 30 minutes long, … it feels just “randomly” and doesn’t happen every day), so that the server in this time is nearly unusable.Okay, maybe the reason is of interrupts, but i really can’t find out what the problem is. I’ve run long tests via smartctl for the HDDs and some other hardware benchmarks to stress the hardware. No problems he
Norbert
pic microchip timer interrupts
I tried to setup Timer0 on a Microchip PIC18F46K22 so that it will trigger an interrupt and toggle an LED. However, it takes at least 42 µs for the LED to toggle.At an increment rate of Fosc/4 (= 8 MHz/4 = 2 MHz), a TMR0 preload of 0xFF and a two cycle loss when writing to TMR0 I expect to get an interrupt every 1.5 µs, at least on paper. Even if I factor into some instruction cycles for my LED operations, I can’t figure out why it takes 42 µs. What’s wrong here?Here’s my code:volatile unsigned
0xakhil
arm interrupts
I have a LPC1114 kit. Last few days I have been digging up CMSIS implementation of Cortex M0 to find how things are done in it. So far I understood how each registers are mapped and how I can access it. But still I dont know how interrupts are implemented in it. All I know about interrupts in CMSIS is there are some interrupt handler names mentioned in the startup file. And I can write my own handlers by simply writing a C function with the same names mentioned in the startup file. What confuses
Daniel R Hicks
windows-vista cpu ethernet fan interrupts
This is the Windows Vista problem, seen, I think, mostly on dual processor laptops, where % CPU suddenly shoots to about 45% and stays there. Once this has happened, % CPU will never return to normal on its own, though, curiously, “sleeping” the box for a few seconds will reset the condition.I’ve seen this happen many times (Sony VGN-CS215J laptop with Intel dual core CPU) when the box is sitting there doing nothing, with only the normal 2-3% background CPU, then suddenly — BOOM!”Process Explo
Erofire
windows cpu asus acpi interrupts
I know the system interrupts topic is pretty common with varying solutions but I had a question about how to implement a solution in Windows 7 the way I did in Ubuntu 12.04.Background:Bought an ASUS K53SV model laptop in May 2011 and it worked great until a couple of months ago when the CPU started to act up. After using a Latency checker, found the culprit was ACPI.sys Tried a number of solutions until the computer became unusable Installed Ubuntu 12.04 over everything Problem persisted with kw
artistoex
operating-systems computer-architecture interrupts
To give you an impression of the level of detail I’m interested, one example. I know a system call ultimately leads to a trap which lets the processor store registers, switch to supervisor mode and perform an indirect jump. But that’s only a special case (or is it?).So what exactly happens at the hardware level when hardware or software interrupts occur, in general? What are the differences and commonalities? How exactly do hardware and operating system cooperate to get interrupts work the way
ananthan
apache2 kernel syslog ubuntu-11.04 interrupts
We are running ubuntu 11.04 with 2.6.38-13-generic kernel on Intel(R) Xeon(R) CPU E5620 @ 2.40GHz with 48 GB RAM dedicated server with Hardware RAID.top command output is showing many kernel threads running on different cores.thread numberksoftirqd – 16 (one on each core) kworker – 35 migration – 16 (one on each core)We already experienced two freezes and forced to restart the machine,both happened after we made modifications to .htaccess and then reloaded apache.on syslog Gene
Paul A.
embedded c interrupts 8051 keil
My C code has an ISR, where a decision has to be made to execute a particular function “A”. Now I know that its not good to run a function in an ISR. But in this case of my application, I do not see another way out. After calling the function “A”, I noticed a sudden jump in the Data Consumed size and the sudden WARNING L15 explained in KEIL EXPLANATION OF WARNING. I am certain that function “A” is not executed in a reentrant fashion, but it sure uses up physical memory; both function “A” as wel
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