On Fri, 11 Aug 2017 19:41:18 +0800, Jason Wang wrote: > This patch tries to implement XDP for tun. The implementation was > split into two parts: > > - fast path: small and no gso packet. We try to do XDP at page level > before build_skb(). For XDP_TX, since creating/destroying queues > were completely under control of userspace, it was implemented > through generic XDP helper after skb has been built. This could be > optimized in the future. > - slow path: big or gso packet. We try to do it after skb was created > through generic XDP helpers. > > Test were done through pktgen with small packets. > > xdp1 test shows ~41.1% improvement: > > Before: ~1.7Mpps > After: ~2.3Mpps > > xdp_redirect to ixgbe shows ~60% improvement: > > Before: ~0.8Mpps > After: ~1.38Mpps > > Suggested-by: Michael S. Tsirkin <m...@redhat.com> > Signed-off-by: Jason Wang <jasow...@redhat.com>
Looks OK to me now :) Out of curiosity, you say the build_skb() is for "small packets", and it seems you are always reserving the 256B regardless of XDP being installed. Does this have no performance impact on non-XDP case?
