netdev - Re: [V3 PATCH net-next 0/5] xdp: more work on xdp tracepoints

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Date:   Thu, 24 Aug 2017 07:46:13 -0700
From:   John Fastabend <john.fastabend@...il.com>
To:     Jesper Dangaard Brouer <brouer@...hat.com>, netdev@...r.kernel.org
CC:     Daniel Borkmann <borkmann@...earbox.net>
Subject: Re: [V3 PATCH net-next 0/5] xdp: more work on xdp tracepoints

On 08/24/2017 03:32 AM, Jesper Dangaard Brouer wrote:
> 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 looks good to me. Thanks a lot.