Red Hat Bugzilla – Bug 436018
huge number of wakeups
Last modified: 2014-08-11 01:40:43 EDT
Description of problem:
The supposedly tickless rawhide x86-64 kernel is much worse than the F8 kernel.
I'm now up to around 140 wkaeups per second on an idle machine. Powertop shows:
~50% <kernel API> : Rescheduling interrupts
~13% <interrupt> : iwl4965
~8% group_balance : schedule_timeout (process_timedout)
~8% at-spi-registry : schedule_timeout (process_timedout)
~5% <interrupt> : extra timer interrupt
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1.start that kernel on X61 laptop
< 20 (< 10 ?) wakeups per second. Well, maybe the wifi adds more.
Same for me, "rescheduling interrupts" is 50% of wakeups on a sony sz61mn/b,
This problem of "rescheduling interrupts" is also occurring in
I spoke with Arjan about this a few days ago. His hypothesis was that something
changed in the scheduler which is causing us to rebalance tasks too often.
Peter, any ideas ?
did this get anywhere?
observing under 25-14.fc9.x86_64, on an T61, playing audio but nothing else,
rescheduling interrupts range cause 170-200 (50-65%) wakeups.
fwiw, the case is the same if I boot with noirqbalance and acpi_irq_nobalance.
Before rhythbox is loaded, the IRQ rebalancing is happening, but very
infrequently (<20/s) but once loaded, that moves to ~200/s. rhythmbox itself is
causing <40/s while music is playing.
happy to test if needed.
Changing version to '9' as part of upcoming Fedora 9 GA.
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