Hello,
I am working on trying to obtain near line rate for a ConnectX-3 adapter (MCX354A). I am also trying to minimize or eliminate packet loss for high-throughput UDP transfers. One parameter that I have found makes a large difference is the setting for the receive ring buffer size. The default value was 1024, which I have increased to 8192:
# ethtool -g eth2
Ring parameters for eth2:
Pre-set maximums:
RX: 8192
RX Mini: 0
RX Jumbo: 0
TX: 8192
Current hardware settings:
RX: 8192
RX Mini: 0
RX Jumbo: 0
TX: 8192
To what exactly does that number correspond? Is it a number of 4KB memory buffers (for 4KB pages)? Does each entry correspond to the current MTU? Basically, I am trying to determine how many packets of a given size can fit in the receive ring.
Regards,
Thomas