From: Jesper Dangaard Brouer <bro...@redhat.com> Date: Thu, 24 Aug 2017 12:32:58 +0200
> More work on streamlining and performance optimizing the tracepoints > for XDP. > > I've created a simple xdp_monitor application that uses this > tracepoint, and prints statistics. Available at github: > > https://github.com/netoptimizer/prototype-kernel/blob/master/kernel/samples/bpf/xdp_monitor_kern.c > https://github.com/netoptimizer/prototype-kernel/blob/master/kernel/samples/bpf/xdp_monitor_user.c > > The improvement over tracepoint with strcpy: 9810372 - 8428762 = +1381610 pps > faster > - (1/9810372 - 1/8428762)*10^9 = -16.7 nanosec > - 100-(8428762/9810372*100) = strcpy-trace is 14.08% slower > - 981037/8428762*100 = removing strcpy made it 11.64% faster > > V3: Fix merge conflict with commit e4a8e817d3cb ("bpf: misc xdp redirect > cleanups") > V2: Change trace_xdp_redirect() to align with args of trace_xdp_exception() Series applied, thanks Jesper.
