On 08/17/2010 03:22 PM, Manikandan Ramachandran wrote:
I see a scenario where higher priority task is ready to run but lower priority IRQ thread is hogging the cpu. Please see the timeline log below: GIVE ffff0c1c [Comment: High priority IRQ thread wakes up high priority process at jiffy 0xffff0c1c] **ffff0c21**##ffff0c21##**ffff0c21**##ffff0c21##**ffff0c21**##ffff0c21##**ffff0c21**##ffff0c21##**ffff0c21**##ffff0c22##**ffff0c22**##ffff0c22##**ffff0c22**##ffff0c22##**ffff0c22**##ffff0c22##**ffff0c22**##ffff0c22##**ffff0c22**##ffff0c22##**ffff0c22**##ffff0c22##**ffff0c22**##ffff0c22##**ffff0c23**##ffff0c23##**ffff0c23**##ffff0c23##**ffff0c23**##ffff0c24##**ffff0c24**##ffff0c24##**ffff0c24**##ffff0c24## [Comment: Low priority IDE[ide_intr] handler hogs CPU for almost 3 ms] GOTffff0c26 [Comment: High priority task wakes up after 10 ms!!] I fail to understand why scheduler failed to schedule high priority task 10 times in a row. FYI, I have put IDE thread to SCHED_NORMAL while high priority thread and task to SCHED_FIFO.
Not really sure from the above what's going on, what priorities you are running at, etc. You might want look at the output of "ps -eLo pid,rtprio,policy,comm" to see if you can confirm your scheduler attributes. thanks, Nivedita -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
