Welp at least 40% maximum utilization is totally usable, but not that great. Many ARM chips could achieve maximum 60% percent of the theoratical BW(Snapdragon 835 theoratical:30GB/s actual 18G/s https://www.anandtech.com/show/11201/qu ... -preview/2). For x86 chips, ryzen and intel could simply achieve well above 80% theoratical BW.jdb wrote: ↑Tue Jul 28, 2020 9:18 amBroadcom don't support end customers. They sell chips to other businesses. As such, don't expect a random Broadcom employee to start answering your questions.Gnyueh wrote: ↑Tue Jul 28, 2020 8:52 am
My apologies I was overwhelmed by frustration just now, I have editted the post. But broadcomm seems reluctant to deal with these issues and provide more information about this. Again, I don't think this memory performance for an LPDDR4 memory is satisfying. Jetson utilizes much stronger GPU and its performance scales just fine. It would be great if you could provide some more information on this especially for the memory sub system in BCM2711.
Thanks again for reminding me.
What makes you think the ARM CPUs *should* be able to maximise transfers up to the theoretical bandwidth of the memory bus?
Hint: no CPUs are capable of this.
And the perf down-scaling as thread inceases for RPi is surprising. Hope there will be hardware or firmware improvements&enhancement on this if possible, especially for the future products.