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

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Date:   Wed, 9 Jun 2021 09:31:39 +0800
From:   Yunsheng Lin <linyunsheng@...wei.com>
To:     Vladimir Oltean <olteanv@...il.com>,
        Jakub Kicinski <kuba@...nel.org>
CC:     <davem@...emloft.net>, <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: Re: [PATCH net-next v2 0/3] Some optimization for lockless qdisc

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.

By the way, I did not pick up your "Tested-by" from previous
RFC version because there is some change between those version
that deserves a retesting. So it would be good to have a
"Tested-by" from you after confirming no out of order happening
for this version, thanks.