DDR Bandwidth Read Utilization - 2019.2 English

Vitis Guidance Messaging (UG1315)

Document ID
UG1315
Release Date
2019-10-30
Version
2019.2 English

Description

This rule checks and issues if there is low read bandwidth utilization of the associated DDR bank.

Explanation

The read bandwidth utilization gives an indicator to the user that the kernel is not reading the data from the DDR at the maximum potential. This will have an impact on the time to read from the DDR. The read bandwidth utilization is mainly dependent on transfer rate = Total Bytes transferred to the DDR per bus active time.

Resolution

To improve the read bandwidth utilization the user has to improve the Total Bytes transferred and decrease the maxi bus active time.

To improve the Total bytes transferred the user can increase the port width size on the interface to 512.

To improve the DDR per bus active time, the user should be doing more burst access instead of single access on the AXI.