]> git.baikalelectronics.ru Git - kernel.git/commit
Merge branch 'xdp-more-work-on-xdp-tracepoints'
authorDavid S. Miller <davem@davemloft.net>
Thu, 24 Aug 2017 18:59:37 +0000 (11:59 -0700)
committerDavid S. Miller <davem@davemloft.net>
Thu, 24 Aug 2017 18:59:37 +0000 (11:59 -0700)
commit13cbf7dbcfffaf544c0f3fd317b372a98e2f0231
treebda1e6b0dc4649bdc45162c59b6d1df6e2ecdf2f
parentdb042e3b51583229b991aabad26bd7325a50b109
parenta0401f93cd26d7d13d783abdd0412bb698f74df7
Merge branch 'xdp-more-work-on-xdp-tracepoints'

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 89b0de41fede ("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>