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

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Message-ID: <20210609092016.4c43192f@kicinski-fedora-PC1C0HJN.hsd1.ca.comcast.net>
Date:   Wed, 9 Jun 2021 09:20:16 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Yunsheng Lin <linyunsheng@...wei.com>, <cong.wang@...edance.com>,
        <xiyou.wangcong@...il.com>, <john.fastabend@...il.com>,
        <mkubecek@...e.cz>
Cc:     Vladimir Oltean <olteanv@...il.com>, <davem@...emloft.net>,
        <ast@...nel.org>, <daniel@...earbox.net>, <andriin@...com>,
        <edumazet@...gle.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>,
        <jiri@...nulli.us>, <andrii@...nel.org>, <kafai@...com>,
        <songliubraving@...com>, <yhs@...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>, <bjorn@...nel.org>, <alobakin@...me>
Subject: Re: [PATCH net-next v2 0/3] Some optimization for lockless qdisc

On Wed, 9 Jun 2021 09:31:39 +0800 Yunsheng Lin wrote:
> On 2021/6/8 20:53, Vladimir Oltean wrote:
> > On Thu, Jun 03, 2021 at 11:35:48AM -0700, Jakub Kicinski wrote:  
> >> 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>  
> > 
> > Any idea why these patches are deferred in patchwork?
> > https://patchwork.kernel.org/project/netdevbpf/cover/1622684880-39895-1-git-send-email-linyunsheng@huawei.com/  
> 
> I suppose it is a controversial change, which need more time
> hanging to be reviewed and tested.

That'd be my guess also. A review from area experts would be great,
perhaps from Cong, John, Michal..  If the review doesn't come by
Friday - I'd repost.