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

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Date:   Thu, 24 Aug 2017 12:00:17 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     brouer@...hat.com
Cc:     netdev@...r.kernel.org, borkmann@...earbox.net
Subject: Re: [V3 PATCH net-next 0/5] xdp: more work on xdp tracepoints

From: Jesper Dangaard Brouer <brouer@...hat.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.