Genesys ZU3EG - increase CPU (Linux) Clock Frequency from recent 1.2gHz to 1.5

[DrGuenter]

Hello everybody,

I am curious, whether and how it is posible to increase the (Linux) clock frequency from 1.2gHz to 1.5gHz -
as the xilinx chip can execute that fast. 

Are there limitations - like cooling - which would inhibit the freqnency increase -> what are the reasons to limit the clock frequency down in an eval board? 

thanks in advance,

DrGuenter

PS: Background - we are executing core mark pro (https://github.com/eembc/coremark-pro/) benchmark tests - and would love to see the full range - even if the cooling concept should be modified.

/sys/devices/system/cpu# cat cpufreq/policy0/cpuinfo_max_freq
1199999

/sys/devices/system/cpu# cat cpufreq/policy0/scaling_available_frequencies
299999 399999 599999 1199999

 

WORKLOAD RESULTS TABLE

                                                 MultiCore SingleCore
Workload Name                                     (iter/s)   (iter/s)    Scaling
----------------------------------------------- ---------- ---------- ----------
cjpeg-rose7-preset                                  142.86      36.50       3.91
core                                                  1.02       0.25       4.08
linear_alg-mid-100x100-sp                            48.26      12.55       3.85
loops-all-mid-10k-sp                                  1.89       0.65       2.91
nnet_test                                             3.10       0.93       3.33
parser-125k                                          20.51       8.33       2.46
radix2-big-64k                                      134.14      82.20       1.63
sha-test                                            238.10      70.42       3.38
zip-test                                             75.47      20.00       3.77

MARK RESULTS TABLE

Mark Name                                        MultiCore SingleCore    Scaling
----------------------------------------------- ---------- ---------- ----------
CoreMark-PRO                                       2682.54     851.67       3.15
 

[JColvin]

Hi @DrGuenter,

I have asked another engineer more familiar with the Genesys ZU hardware for their insight on your question.

Thanks,
JColvin

[BogdanVanca]

Hi @DrGuenter,

 I'm sorry for my late answer.  The current speed grade gives limitations as stated in the Processor Performance table. The maximum supported frequency is 1.2GHz. Check below:

https://docs.xilinx.com/r/en-US/ds925-zynq-ultrascale-plus/Processor-System-PS-Performance-Characteristics

I've also confirmed this in the hardware project.

Best Regards,

Bogdan Vanca