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Registered: ‎06-28-2020

Unable to change the Ethernet Ring parameters (RX_BUF_SIZE & TX_BUF_SIZE) on ZYNQ Z7045 based dev board running on Ubuntu 20.04 LTS(armhf)

We are using a ZYNQ XCZ7045 FFG676 based development board.

On which we have built a linux boot image with Ubuntu 20.04 LTS (meant for armhf) installed in its rootfs partition. 

We are trying to increase the RX & TX Ring parameters (specifically the RX & TX Buffer size) using ethtool commands; 

# ethtool -G eth0 rx 64 tx 64

but the buffers are not setting and are returning a error as: 

"Cannot set device ring parameters: Operation not supported"

The current buffer size is set to 0, which is making the data packets to be dropped when high speed (with large data) Ethernet communication is done. 

The same is observed when the rootfs part is changed to Petalinux generated rootfs.cpio.gz also. (keeping the boot images same as the one run for armhf Ubuntu 20.04)


Can anyone suggest how to fix this issue and set the rx & tx buffers to 256?


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