[question] I doublt on timer interrput.

[liyu <liyu@ccoss.com.cn>]

Hi, all:

    I have one question about timer interrupt (i386 architecture).

    As we known, the timer emit HZ times interrputs per second,
and in i386. The interrupt handler will call scheduler_tick()
each time (on i386 at least, both enable or disable APIC).

    On my Celeron machine(IOW, only one CPU, not SMP/SMT), I defined
a global int variable 'tick_count' in kernel/sched.c, and add one line
of code like follow in scheduler_tick():

    ++tick_count;

    but I found it is not same with content of the /proc/interrupts,
and the differennt between them is not little.
   
    I can not understand why that is.
   
    Any useful idea.



-liyu / NOW~