[H2D Bandwidth] H2D Bandwidth Degradation Due to Suboptimal Max Payload Size

Symptom

The bandwidth result does not meet the expectation when Ascend DMI is used to test the bandwidth.

Possible Causes

To ensure the optimal H2D bandwidth, change the default value (256B) of Max Payload Size to 512B on the host in ARM architecture.

Solution

1. Log in to the iBMC WebUI, start the virtual console, and select HTML5 Integrated Remote Console for remote management.

   

2. On the toolbar of the virtual interface, click to access the boot configuration page, select BIOS Setup, and click to restart the server.

   

3. After the system is restarted, the BIOS page is displayed. Choose Advanced > PCIe Config.

   

4. Go to the CPU PCIe Configuration page.

   

5. Select Port 0.

   

6. Change Max Payload Size to 512B.