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e7d12ce121
Jesper Dangaard Brouer says:
====================
xdp: more work on xdp tracepoints
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 e4a8e817d3 ("bpf: misc xdp redirect cleanups")
V2: Change trace_xdp_redirect() to align with args of trace_xdp_exception()
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.