linux-kernel - Re: [PATCH net-next v2 0/3] Some optimization for lockless qdisc

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Date:   Thu, 3 Jun 2021 11:35:48 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Yunsheng Lin <linyunsheng@...wei.com>
Cc:     <davem@...emloft.net>, <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>,
        <yhs@...com>, <john.fastabend@...il.com>, <kpsingh@...nel.org>,
        <bpf@...r.kernel.org>, <jonas.bonn@...rounds.com>,
        <pabeni@...hat.com>, <mzhivich@...mai.com>, <johunt@...mai.com>,
        <albcamus@...il.com>, <kehuan.feng@...il.com>,
        <a.fatoum@...gutronix.de>, <atenart@...nel.org>,
        <alexander.duyck@...il.com>, <hdanton@...a.com>, <jgross@...e.com>,
        <JKosina@...e.com>, <mkubecek@...e.cz>, <bjorn@...nel.org>,
        <alobakin@...me>
Subject: Re: [PATCH net-next v2 0/3] Some optimization for lockless qdisc

On Thu, 3 Jun 2021 09:47:57 +0800 Yunsheng Lin wrote:
> Patch 1: remove unnecessary seqcount operation.
> Patch 2: implement TCQ_F_CAN_BYPASS.
> Patch 3: remove qdisc->empty.
> 
> Performance data for pktgen in queue_xmit mode + dummy netdev
> with pfifo_fast:
> 
>  threads    unpatched           patched             delta
>     1       2.60Mpps            3.21Mpps             +23%
>     2       3.84Mpps            5.56Mpps             +44%
>     4       5.52Mpps            5.58Mpps             +1%
>     8       2.77Mpps            2.76Mpps             -0.3%
>    16       2.24Mpps            2.23Mpps             +0.4%
> 
> Performance for IP forward testing: 1.05Mpps increases to
> 1.16Mpps, about 10% improvement.

Acked-by: Jakub Kicinski <kuba@...nel.org>