On 07/26/2018 10:04 AM, Oliver Effland wrote:
Hi,
First of all: thanks for all the valuable input! @(Russell, Dietmar & Steven)
On 07/23/2018 08:51 AM, Steven Miao wrote:
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A7: freq(MHz) voltage(mV) Power(mW) A7_Power(mW) Stat_Power(mW) DPC 200 918.750 34.768 12.203 10.362 72.283955 400 920.000 60.805 21.25 18.305 62.765831 600 968.750 98.046 35.084 27.878 62.306652 800 1042.500 148.095 52.285 43.525 60.136063 1000 1116.250 212.214 76.112 59.99 61.084382 1200 1190.000 288.958 99.993 88.972 58.842948 1400 1288.750 411.936 144.807 122.322 62.276495
mean: 62A15: freq(MHz) voltage(mV) Power(mW) A15_Power(mW) Stat_Power(mW) DPC 200 916250 122.584 31.139 60.306 185.458477 500 916250 225.101 68.774 87.553 163.842401 800 942500 349.158 112.432 124.294 158.211202 1100 1016250 540.78 169.556 201.668 149.251725 1400 1078750 779.19 258.214 262.762 158.493016 1700 1180000 1179.344 392.107 395.13 165.650083 2000 1320000 1969.764 648.768 672.228 186.170798
mean: 164The ratio between A15 and A7 is now 164/62 = 2.645
I hope the dynamic-power-coefficient's are more accurate now?
dynamic-power-coefficient ~= 400 - 500 is reasonable for big core dynamic-power-coefficient ~= 100 is reasonable for LITTLE core. For IPA it can work effectively with a poor power model(not so accurate), for EAS it just need power model of LITTLE core and big core is proportional.
I'm guessing my values differ from your suggested values, because it's 32bit ARM?
We're running TC2 (32 bit Arm A15/A7 _test_ chip) with a ratio between A15 and A7 of 990/113 = 7.44.
For EAS, i.e. for task wake-up placement decisions based on task utilization and cpu capacity, on big.LITTLE this ratio is important.
How do you want to evaluate EAS v4 (or v5) on your ODROID-XU3 board? What kind of workloads and/or benchmarks will you run on it?
-- Dietmar
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