Hi! > >>>And now it is: > >>>[692517.868523] ACPI: Preparing to enter system sleep state S3 > >>>[692518.172074] ACPI : EC: EC stopped > >>>[692518.172076] PM: Saving platform NVS memory > >>>[692518.172269] Disabling non-boot CPUs ... > >>>[692518.172269] ACPI: Low-level resume complete > >>>[692518.172269] ACPI : EC: EC started > >>>[692518.172269] PM: Restoring platform NVS memory > >>>[692518.172269] ACPI: Waking up from system sleep state S3 > >>> > >>>Is there any test I could do on the CPU wakeup while in that state? > >>> > >>Is there a way to kick the offline-CPU into operation from /sys level? > >echo 0 > /sys/devices/system/cpu/cpu1/online > > > >should work. And... good thinking :-). > > Pavel > Did not work, > echo 0 > /sys/devices/system/cpu/cpu1/online > -su: echo: write error: Device or resource busy > > However > echo 1 > /sys/devices/system/cpu/cpu1/online > did not return an error ( but still only CPU0 seen) > > Interesting experiment: I have hibernated and then woke up - and still only > CPU0. I was expecting that after the power cycle the hotplug will bring CPU1 > up...
Which is interesting indeed. Hardware was powercycled, so what is
broken is probably some kernel state...
[Evil: /sys/devices/cpu/ -- some perf stuff.
/sys/devices/system/cpu -- that's where real CPU stuff is
hiding.]
cd /sys/devices/system/cpu/cpu1
while true; do echo 0 > online; echo 1 > online; done
...crashes x60 with 4.10-rc in few minutes. [Which is bad -- it should
not die, but also good -- this is easier to reproduce then running 100
suspend cycles.]
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures)
http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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