On Tue, Apr 17, 2018 at 09:07:01AM +0200, Jesper Dangaard Brouer wrote: > > > number should improve more). > > > > What is the number for the otherwise comparable setup without repolines? > > Approx 12 Mpps. > > You forgot to handle the dma_direct_mapping_error() case, which still > used the retpoline in the above 8.9 Mpps measurement, I fixed it up and > performance increased to 9.6 Mpps. > > Notice, in this test there are still two retpoline/indirect-calls > left. The net_device->ndo_xdp_xmit and the invocation of the XDP BPF > prog.
But that seems like a pretty clear indicator that we want the fast path direct mapping. I'll try to find some time over the next weeks to do a cleaner version of it.
