From: Davide Caratti <dcara...@redhat.com>
Date: Mon, 22 Jan 2018 18:14:30 +0100
> Similarly to what has been done earlier with other actions [1][2], this
> series tries to improve the performance of 'csum' tc action, removing a
> spinlock in the data path. Patch 1 lets act_csum use per-CPU counters;
> patch 2 removes spin_{,un}lock_bh() calls from the act() method.
>
> test procedure (using pktgen from https://github.com/netoptimizer):
>
> # ip link add name eth1 type dummy
> # ip link set dev eth1 up
> # tc qdisc add dev eth1 root handle 1: prio
> # for a in pass drop; do
> > tc filter del dev eth1 parent 1: pref 10 matchall action csum udp
> > tc filter add dev eth1 parent 1: pref 10 matchall action csum udp $a
> > for n in 2 4; do
> > ./pktgen_bench_xmit_mode_queue_xmit.sh -v -s 64 -t $n -n 1000000 -i eth1
> > done
> > done
>
> test results:
>
> | | before patch | after patch
> $a | $n | avg. pps/thread | avg. pps/thread
> -----+----+-----------------+----------------
> pass | 2 | 1671463 ± 4% | 1920789 ± 3%
> pass | 4 | 648797 ± 1% | 738190 ± 1%
> drop | 2 | 3212692 ± 2% | 3719811 ± 2%
> drop | 4 | 1078824 ± 1% | 1328099 ± 1%
>
> references:
>
> [1] https://www.spinics.net/lists/netdev/msg334760.html
> [2] https://www.spinics.net/lists/netdev/msg465862.html
Series applied, thanks Davide.
