On Mon, 8 Jul 2024 at 19:01, Srivats P <pstavirs@xxxxxxxxx> wrote: > > Hi, > > What is the expected performance for AF_XDP txpnly in zero-copy and copy modes? > > With Kernel 6.5.0 and the same ixgbe driver, this is what we see - > > ZC mode: 4.3Mpps > Copy mode: 3.3Mpps > > This doesn't seem right. Shouldn't the zero copy performance be MUCH higher? Zero-copy performance should be line rate for the ixgbe card, so somewhere around 15Mpps. SKB mode seems in the correct ballpark. Try pinning the app to a core the driver does not run on, or use busy-poll mode "-B". If you are running on a NUMA system, make sure you are running both driver and app on the NUMA node you have plugged your NIC into. > host:~$ sudo ./ubuntu22.04-xdpsock -t -i enp2s0f0 -z > > sock0@enp2s0f0:0 txonly xdp-drv > pps pkts 1.00 > rx 0 0 > tx 2,969,121 2,969,536 > > sock0@enp2s0f0:0 txonly xdp-drv > pps pkts 1.00 > rx 0 0 > tx 4,315,534 7,285,632 > > sock0@enp2s0f0:0 txonly xdp-drv > pps pkts 1.00 > rx 0 0 > tx 4,315,335 11,601,344 > > sock0@enp2s0f0:0 txonly xdp-drv > pps pkts 1.00 > rx 0 0 > tx 4,316,276 15,918,080 > > sock0@enp2s0f0:0 txonly xdp-drv > pps pkts 1.00 > rx 0 0 > tx 4,315,285 20,233,920 > > host:~$ sudo ./ubuntu22.04-xdpsock -t -i enp2s0f0 -c > > sock0@enp2s0f0:0 txonly xdp-drv > pps pkts 1.00 > rx 0 0 > tx 3,326,724 3,327,744 > > sock0@enp2s0f0:0 txonly xdp-drv > pps pkts 1.00 > rx 0 0 > tx 3,314,220 6,642,688 > > sock0@enp2s0f0:0 txonly xdp-drv > pps pkts 1.00 > rx 0 0 > tx 3,317,285 9,960,448 > > sock0@enp2s0f0:0 txonly xdp-drv > pps pkts 1.00 > rx 0 0 > tx 3,323,394 13,284,352 > > Any thoughts or pointers or things to check for are appreciated! > > Srivats >
|