OpenCL Host-to-Memory Read Speed varies in linux kernels

[jackgreen]

Board: Teriasic De10 Nano

OpenCL for FPGA standard 18.1

Hi everyone, 

I am working on a project on De10 nano using OpenCL. I ran an official board test program from Terasic on two OS.

One is the official img from Terasic and got a Host-global-memory read speed of 155 MB/s

The other one is on a linux kernel 4.19 with Ubuntu and got a Host-global-memory read speed of 60 MB/s.

Does anyone know are there any configurations in kernel complication that would affect the Host-global-memory read speed?

The boardtest reports are attached.

Thanks in advance! 

[BoonBengT_Intel]

Hi @jackgreen,

Thank you for posting in Intel community forum, hope all is well and apologies for the delayed in response.
Following up on the queries, please do let us know if the doubts are still here, and we would try our best to clarify.

Best Wishes
BB

[BoonBengT_Intel]

Hi @jackgreen,

Greetings, as we do not receive any further clarification on what is provided. Hence would assume problem are resolved and we will no longer monitor this thread. For new queries or problem persist, please feel free to reopen existing thread or open a new thread and we will be right with you. Pleasure having you here.

Best Wishes
BB