https://bugzilla.kernel.org/show_bug.cgi?id=12788
--- Comment #66 from ykzhao <yakui.z...@intel.com> 2010-12-06 03:30:14 ---
Hi, James
Sorry for the late response about the issue. It is very strange that the
number of wakeup is increased very significantly after suspend/resume when the
mwait is used to enter the idle state.
From the section 8.10.4 of Intel Software Developer Manual, it seems that
it will exit the idle state under the following cases:
a. write to the monitored address configured by Monitor instruction(In the
code the current_thread_info->flags is the corresponding monitor address)
b. External interrupts, including NMI, SMI, INIT, BINIT, MCERR, A20M#
c. Faults, Aborts (including Machine Check)
d. Architectural TLB invalidations including writes to CR0, CR3, CR4 and
certain MSR writes
But from the powertop info it seems that the number of interrupts/timer
event is farther less than the number of wakeup. Not sure why the number of
wakeup is affected so significantly by mwait after suspend/resume.
Please use the boot option of "idle=nomwait" to workaround this issue.
Thanks.
Yakui
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