> > 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. I had forced zero-copy mode (-z) and copy mode (-c) to get the above results. So the xsk creation would have failed if it were not zero copy mode. This is not a NUMA system - just one CPU with 8 cores, HT disabled. Nothing else taking up CPU on the system, so I don't think the app and the softirq would have been sharing a core. Unfortunately, this is at a customer - so I have asked them to try taskset or use -B. Will update when I hear back from them. Thanks Magnus! Srivats
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