netdev - Re: [Linuxarm] [PATCH RFC v4 0/3] Some optimization for lockless qdisc

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Date:   Thu, 20 May 2021 17:45:14 +0800
From:   Yunsheng Lin <linyunsheng@...wei.com>
To:     <davem@...emloft.net>, <kuba@...nel.org>,
        <a.fatoum@...gutronix.de>, <vladimir.oltean@....com>
CC:     <olteanv@...il.com>, <ast@...nel.org>, <daniel@...earbox.net>,
        <andriin@...com>, <edumazet@...gle.com>, <weiwan@...gle.com>,
        <cong.wang@...edance.com>, <ap420073@...il.com>,
        <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linuxarm@...neuler.org>, <mkl@...gutronix.de>,
        <linux-can@...r.kernel.org>, <jhs@...atatu.com>,
        <xiyou.wangcong@...il.com>, <jiri@...nulli.us>,
        <andrii@...nel.org>, <kafai@...com>, <songliubraving@...com>,
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        <JKosina@...e.com>, <mkubecek@...e.cz>, <bjorn@...nel.org>,
        <alobakin@...me>
Subject: Re: [Linuxarm] [PATCH RFC v4 0/3] Some optimization for lockless
 qdisc

On 2021/5/20 17:27, Yunsheng Lin wrote:
> Patch 1: remove unnecessary seqcount operation.
> Patch 2: implement TCQ_F_CAN_BYPASS.
> Patch 3: remove qdisc->empty.
> 
> RFC v4: Use STATE_MISSED and STATE_DRAINING to indicate non-empty
>         qdisc, and add patch 1 and 3.

@Vladimir, Ahmad
It would be good to run your testcase to see if there are any
out of order for this version, because this version has used
STATE_MISSED and STATE_DRAINING to indicate non-empty qdisc,
thanks.

It is based on newest net branch with qdisc stuck patchset.

Some performance data as below:

pktgen + dummy netdev:
 threads  without+this_patch   with+this_patch      delta
    1       2.60Mpps            3.18Mpps             +22%
    2       3.84Mpps            5.72Mpps             +48%
    4       5.52Mpps            5.52Mpps             +0.0%
    8       2.77Mpps            2.81Mpps             +1.4%
   16       2.24Mpps            2.29Mpps             +2.2%

IP forward testing: 1.05Mpps increases to 1.15Mpps

> 
> Yunsheng Lin (3):
>   net: sched: avoid unnecessary seqcount operation for lockless qdisc
>   net: sched: implement TCQ_F_CAN_BYPASS for lockless qdisc
>   net: sched: remove qdisc->empty for lockless qdisc
> 
>  include/net/sch_generic.h | 26 +++++++++++++-------------
>  net/core/dev.c            | 22 ++++++++++++++++++++--
>  net/sched/sch_generic.c   | 23 ++++++++++++++++-------
>  3 files changed, 49 insertions(+), 22 deletions(-)
>