Re: [PATCH 8/8] OMAP3: powerdomain data: add wake-up latency figures

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Paul,

On Fri, Oct 7, 2011 at 5:26 PM, Paul Walmsley <paul@xxxxxxxxx> wrote:
> Hi Jean
>
> On Wed, 21 Sep 2011, jean.pihet@xxxxxxxxxxxxxx wrote:
>
>> Figures are added to the power domains structs for RET and OFF modes.
>>
>> Note: the latency figures for MPU, PER, CORE, NEON have been obtained
>> from actual measurements.
>> The latency figures for the other power domains are preliminary and
>> shall be added.
>>
>> Cf. http://www.omappedia.org/wiki/Power_Management_Device_Latencies_Measurement
>> for a detailed explanation on where are the numbers magically coming from.
>>
>> Tested on OMAP3 Beagleboard in RET/OFF using wake-up latency constraints
>> on MPU, CORE and PER.
>
> A few more question about these numbers.
>
> - Are these numbers the ones right off the hardware, or rounded, or
> worst-case plus a certain percentage?
All measurements results are the worst case values right from the
hardware (HW and SW measurements on the target).

>
> - What frequency/voltage were these measured at?
OPP50

>
> - Also, you mention OMAP3 Beagleboard.  Is that 34xx or 36xx Beagleboard?
34xx Beagleboard

Cf. http://www.omappedia.org/wiki/Power_Management_Device_Latencies_Measurement#cpuidle_results
for the details.

Regards,
Jean

>
> - Paul
>
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