From: Jesper Dangaard Brouer <bro...@redhat.com> Date: Tue, 29 Aug 2017 16:37:35 +0200
> I feel this is as far as I can take the tracepoint infrastructure to > assist XDP monitoring. > > Tracepoints comes with a base overhead of 25 nanosec for an attached > bpf_prog, and 48 nanosec for using a full perf record. This is > problematic for the XDP use-case, but it is very convenient to use the > existing perf infrastructure. > >>From a performance perspective, the real solution would be to attach > another bpf_prog (that understand xdp_buff), but I'm not sure we want > to introduce yet another bpf attach API for this. > > One thing left is to standardize the possible err return codes, to a > limited set, to allow easier (and faster) mapping into a bpf map. Series applied, thanks Jesper.
