Re: ixgbe zero-copy performance

> > 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