On 8/28/20 2:51 PM, Magnus Karlsson wrote:
Optimize the throughput performance of the l2fwd sub-app in the xdpsock sample application by removing a duplicate syscall and increasing the size of the fill ring. The latter needs some further explanation. We recommend that you set the fill ring size >= HW RX ring size + AF_XDP RX ring size. Make sure you fill up the fill ring with buffers at regular intervals, and you will with this setting avoid allocation failures in the driver. These are usually quite expensive since drivers have not been written to assume that allocation failures are common. For regular sockets, kernel allocated memory is used that only runs out in OOM situations that should be rare. These two performance optimizations together lead to a 6% percent improvement for the l2fwd app on my machine. Signed-off-by: Magnus Karlsson <magnus.karlsson@xxxxxxxxx>
Applied, thanks!
