netdev - Re: [PATCH net-next v3 0/2] net/sched: remove spinlock from 'csum' action

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Date:   Mon, 22 Jan 2018 12:23:05 -0800
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Davide Caratti <dcaratti@...hat.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        Jiri Pirko <jiri@...nulli.us>
Subject: Re: [PATCH net-next v3 0/2] net/sched: remove spinlock from 'csum' action

On Mon, Jan 22, 2018 at 9:14 AM, Davide Caratti <dcaratti@...hat.com> wrote:
> 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%

Looks good to me,

Acked-by: Cong Wang <xiyou.wangcong@...il.com>