On 01/13/2012 08:34 PM, Somebody in the thread at some point said:
(adding AmitK)
Amit, do you know of a good place to raid for better cpuidle, closer to
upstream than OZ?
-Andy
On 13 January 2012 12:12, Jassi Brar<jaswinder.si...@linaro.org> wrote:
On 13 January 2012 16:13, Andy Green<andy.gr...@linaro.org> wrote:
On 01/13/2012 05:59 PM, Somebody in the thread at some point said:
Hi,
I'd like to do some tests with cpuidle on my panda board but i'm
facing some issues:
Originally, i'd like to use the Linaro developer image which uses the
landing team branch tilt-linux-linaro-3.1 but the omap4 cpuidle driver
only works when cpu1 is off whereas i'd like to do some test with both
cpus.
The android kernel has got a cpuidle driver which can enter C-states
when both cpus are running and I was wondering if there is a plan to
merge this driver into the tilt-linux-linaro-x.x branch ? maybe in 3.2
?
Then, when I'm testing the landing-panda-11.12-release android image
on my panda board revA1, the cpuidle is using only C0 state (WFI)
according to cpuidle stats.
My test sequence:
prevent suspend with: echo qwerty> /sys/power/wake_lock
let android enter the early_suspend mode
get cpuidle statistics on cpu0 et cpu1 in cpuidle/stateX/time : only
state0 time is different from 0
Is it a normal behavior ?
No I think cpuidle is broken with what we have in tilt-3.1.
It's worth trying tilt-tracking which, last time Jassi looked at it was
working and visiting all the C states.
IIRC, CPU_0 entered C1, C2 states only when the CPU_1 is offline, when I tested.
yes, but I need to keep both cpu online for my tests with sched_mc
Vincent, would you remember exactly which android branch has it working with
both cpus online?
I'm using the the compiled baseline :
https://android-build.linaro.org/builds/~linaro-android/landing-panda-11.12-release/#build=3
For this baseline, a cpuidle device is registered for each CPU (0,1)
unlike the tilt tracking which register a device only for cpu0.
This baseline uses an other cpuidle driver for omap4 which manages both CPU
Vincent
Cheers,
Jassi
--
Andy Green | TI Landing Team Leader
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