Timer interrupt on Linux 3.0.3

Vineeth vneethv at gmail.com
Fri Sep 16 21:43:06 EST 2011


We are porting Linux on MPC7410 based board. As there was some issue with
the processor DECrementer and timebase registers, we were using an external
count down timer as our DECementer. We used timer_interrupt() function in
arch/powerpc/kernel/time.c as our interrupt handler. Things were working

lately we moved to Linux 3.0.3. What we found was even without a proper
timer, the kernel with initramfs worked (except the calls like sleep,delay
ofcourse); Is there any major difference in the scheduler ? or the way
context switch happens ? is it not depended on the timer interrupt or the
timer ??

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